CN112995581A

Movatterモバイル変換

Info

Publication number: CN112995581A
Application number: CN201911297435.6A
Authority: CN
Inventors: 杨云飞
Original assignee: Beijing Itarge Technology Co ltd
Current assignee: Beijing Itarge Technology Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2021-06-18

Abstract

The embodiment of the invention provides a video monitoring method and a video monitoring system, relates to the technical field of intelligent transportation and security, and facilitates subsequent image processing, so that clear color images can be obtained in a low-illumination environment, and light pollution is avoided. The method comprises the following steps: and when the ambient illumination is lower than a preset illumination threshold, shooting a monitoring area by adopting a high frame rate exposure mode, and supplementing light of a corresponding wave band to the monitoring area according to a frame ordinal number. The invention is suitable for the video monitoring of places such as traffic violation snapshot, road gates, special lanes, roadside parking, gas stations and the like.

Description

Video monitoring method and system

Technical Field

The invention relates to the technical field of intelligent transportation and security, in particular to a video monitoring method and a video monitoring system.

Background

In the fields of security protection, face recognition, military, industry and the like, images with higher brightness, truer color and higher definition are often required to be acquired in a low-illumination environment, such as at night. Because the illuminance at night is low, the quality of an original image obtained by a traditional video monitoring mode at night is poor, for example, the color is not real, the color of target details cannot be clearly seen, and the like, so that the subsequent image processing is inconvenient to obtain a clear color image; in addition, in some solutions, the above problems can be solved by performing light supplement through a high-power light supplement device, but light pollution exists in light emitted by the light supplement device.

Disclosure of Invention

In view of this, embodiments of the present invention provide a video monitoring method and system, which are convenient for subsequent image processing, so as to obtain a clear color image in a low-illumination environment and avoid light pollution.

In order to achieve the purpose, the invention adopts the following technical scheme:

a video surveillance method, comprising:

and when the ambient illumination is lower than a preset illumination threshold, shooting a monitoring area by adopting a high frame rate exposure mode, and supplementing light of a corresponding wave band to the monitoring area according to a frame ordinal number.

Optionally, the supplementing the light of the corresponding band to the monitoring region according to the frame ordinal number includes:

if the frame number is odd, supplementing visible light of 400-680nm wave band to the monitoring area;

if the frame number is even, supplementing the near infrared light of the 900-1000nm wave band to the monitoring area; or supplementing the visible light of 400-680nm band and the near infrared light of 900-1000nm band.

Optionally, the method further comprises: respectively carrying out image processing on the shot odd frame pictures and the shot even frame pictures;

respectively converting the odd frame picture and the even frame picture into YUV formats;

extracting UV components of odd frame pictures and Y components of even frame pictures; y represents luminance, U and V represent chrominance;

and merging the UV component and the Y component of the adjacent odd frame and even frame to obtain a new picture frame.

Optionally, the method further comprises: when the ambient illumination is lower than a preset illumination threshold value, switching to a double-pass filter for passing through the double-waveband light;

the supplementing of the light of the corresponding band to the monitoring region according to the frame ordinal number includes:

and starting the light supplementing equipment with light rays of corresponding wave bands to enable the light rays to be emitted to the monitoring area through the double-pass filter.

Optionally, the method further comprises: and when the ambient illumination is higher than a preset illumination threshold, shooting the monitoring area by adopting a low frame rate exposure mode.

Optionally, when the ambient illuminance is higher than the preset illuminance threshold, switching to a single-pass filter for passing the single-band light.

In a second aspect, an embodiment of the present invention provides a video monitoring system, including: the device comprises an image sensor, a control module and a light supplementing device;

the image sensor and the light supplement equipment are respectively connected with the control module, and the light supplement equipment is used for providing illumination;

when the ambient illumination is lower than a preset illumination threshold, the control module is used for sending a first control signal to the image sensor so that the image sensor shoots a monitored area in a high frame rate exposure mode;

the control module further sends a second control signal to the light supplementing device according to the number of the currently shot frame sequence, so that the light supplementing device supplements the light of the corresponding band to the monitored area according to the frame sequence.

Optionally, the light supplement device includes a visible light supplement lamp and a near-infrared supplement lamp;

the control module sends a second control signal to the light supplementing device according to the number of the currently shot frame sequence, so that the light supplementing device supplements light of a corresponding band to the monitoring area according to the frame sequence, and the method comprises the following steps:

if the control module determines that the frame number is odd, the visible light supplementary lamp is turned on to supplement the visible light with the wavelength band of 400-680nm to the monitoring area;

if the control module determines that the frame number is even, a near-infrared light supplement lamp is turned on to supplement the near-infrared light of the 900-plus-1000 nm waveband to the monitored area; or supplementing the visible light of 400-680nm band and the near infrared light of 900-1000nm band.

Optionally, a light outlet of the near-infrared light supplement lamp is provided with a filter film, and the filter film is used for transmitting light with a wavelength of 900nm to 1000 nm.

Optionally, the device further comprises an image processor connected with the image sensor;

the image processor receives the images shot by the image sensor and respectively processes the images of the shot odd frame images and the shot even frame images;

Optionally, the system further comprises: the light filtering component of the switchable light filter is arranged in front of the image sensor and comprises a double-pass light filter for passing through double-waveband light, a single-pass light filter for passing through single-waveband light and a motor component for switching between the double-pass light filter and the single-pass light filter, and the motor component is connected with the control module;

when the ambient illumination is lower than a preset illumination threshold value, the control module controls the motor assembly to be switched into a double-pass filter plate for passing through the double-waveband light;

the control module sends a starting control signal to the light supplementing equipment with light rays of corresponding wave bands, so that the light rays emitted by the light supplementing equipment are emitted to the monitoring area through the double-pass optical filter.

Optionally, when the ambient illuminance is higher than the preset illuminance threshold, the control module is further configured to send a third control signal to the image sensor, so that the image sensor shoots the monitored area in a low frame rate exposure mode.

when the ambient illumination is higher than the preset illumination threshold value, the control module controls the motor assembly to be switched into a single-pass filter for passing single-waveband light.

Optionally, the system further comprises: and the ambient illumination monitoring module is used for monitoring the real-time ambient illumination and sending the real-time ambient illumination to the control module.

Optionally, the number of the image sensors is one, a lens is disposed in front of the image sensors, and the filter assembly of the switchable filter is disposed between the image sensors and the lens.

The embodiment of the invention provides a video monitoring method and a video monitoring device, wherein when the ambient illumination is lower than a preset illumination threshold, a high frame rate exposure mode is adopted to shoot a monitored area, and light of a corresponding wave band is supplemented to the monitored area according to a frame number; therefore, through the shooting in the high frame rate exposure mode and the addition of light of the corresponding wave band according to the frame sequence number, an original image with better picture quality can be obtained in a low-illumination environment, such as at night, and the subsequent image processing is convenient, so that a clear color image can be obtained in the low-illumination environment; in addition, because the light of the corresponding wave band is supplemented according to the number of the frame sequences, the light can be supplemented in a targeted manner, and the light of the wave band which can generate light pollution is not contained, so that the light pollution is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow chart of a video monitoring method according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a video monitoring method according to another embodiment of the present invention;

FIG. 3 is a block diagram of a video surveillance system according to an embodiment of the present invention;

FIG. 4 is a block diagram of a dual-sensor dual-lens video surveillance system according to an embodiment of the present invention;

FIG. 5 is a block diagram of a dual-sensor single-lens video surveillance system according to another embodiment of the present invention;

FIG. 6 is a graph of the parameter of the light sensing characteristics of light of different wavelength bands;

FIG. 7 is a graph of a parameter of a single-pass filter according to an embodiment of the present invention;

FIG. 8 is a parameter graph of photosensitive characteristics of a dual pass filter according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a filter assembly of a switchable filter according to an embodiment of the present invention;

FIG. 10 is a schematic view of a video surveillance system operating in a low-light environment at night;

FIG. 11 is a schematic view of a video surveillance system according to the present invention in a daytime under high illumination;

fig. 12 is a reference diagram illustrating the fusion process and the final effect of forming a clear color image in a low-light environment at night according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1, the video monitoring method provided by the embodiment of the invention is mainly used in the technical field of intelligent transportation and security, and particularly can be used for video monitoring of places such as traffic intersection violation snapshot, road gates, special lanes, roadside parking, gas stations and the like; the method comprises the following steps:

step 101, obtaining real-time environment illumination, and comparing the environment illumination with a preset illumination threshold.

In this embodiment, an ambient illumination monitor may be specifically used for monitoring, and the comparison of the specific ambient illumination may be completed by the ambient illumination monitor, or may be completed by a control module of the video monitoring system.

Step 102A, if the ambient illumination is lower than a preset illumination threshold, shooting a monitored area by adopting a high frame rate exposure mode, and supplementing light of a corresponding wave band to the monitored area according to a frame number.

In the present embodiment, it can be understood that the subject of the shooting is an image sensor or a camera with an image sensor, and the image sensor, also called a photosensitive element, is a device for converting an optical image into an electronic signal, and is widely used in cameras. The monitoring area is a video monitoring place, such as an intersection, a parking lot, a non-motor vehicle lane and the like; the High Frame Rate (fps, frames/second) is also called High Frame Rate format (HFR), and means that a movie is shot at a Frame Rate of 48 frames or more per second. Compared with the prior 24-frame or 25-frame picture, the high frame rate can bring clearer and more stable pictures, and the picture quality is better.

The image sensor is shot at a low frame rate of 24 frames or 25 frames, the exposure interval time is usually 0.04s, when the image sensor works at a high frame rate, for example, a 50-frame mode, the exposure interval of two frames is 0.02 s, the change of the imaged scene is negligible, the pixel fusion of the image information of two adjacent frames is facilitated, and the processing of the subsequent images is facilitated.

The frame number refers to the sequential number of the acquired frames, such as the first frame and the second frame.

In addition, in a low illumination environment, such as at night, light in the wavelength band of 700-840nm affects white balance, which is detrimental to image processing, and excessive noise light (light not useful for image capturing and processing) causes light pollution, which is not only detrimental to subsequent image processing, but also causes glare to the driver in a moment, which is very detrimental to safe driving. In this embodiment, light of a corresponding wavelength band is supplemented according to the number of frame sequences, so that light can be supplemented in a targeted manner, and light of a wavelength band causing light pollution is not included, thereby avoiding light pollution.

According to the video monitoring method provided by the embodiment of the invention, through high frame rate exposure mode shooting and adding of light of corresponding wave bands according to the frame sequence number, an original image with better picture quality can be obtained in a low-illumination environment, such as at night, and subsequent image processing is facilitated, so that a clear color image can be obtained in the low-illumination environment; in addition, because the light of the corresponding wave band is supplemented according to the number of the frame sequences, the light can be supplemented in a targeted manner, and the light of the wave band which can generate light pollution is not contained, so that the light pollution is avoided.

In some embodiments of the present invention, the supplementing the monitored area with light of a corresponding band according to a frame ordinal number includes:

determining the odd and even properties of the frame ordinal number; if the frame number is odd, the visible light with the wave band of 400-680nm is supplemented to the monitoring area.

If the frame number is even, the near infrared light of the 900-1000nm wave band is supplemented to the monitoring area.

Or if the frame number is even, supplementing the visible light of 400-680nm band and the near infrared light of 900-1000nm band to the monitoring area.

As mentioned above, when the image sensor operates in the high frame rate mode, for example, 50fps, the interval between two frame exposures is very short, the scene change of the imaging is negligible, i.e. the first frame and the second frame can be regarded as the same scene of the shooting. By using the visible light supplementary lighting for the odd frames, the image information (mainly chrominance information) shot under the visible light is extracted for processing the white balance of the image color, which is beneficial to the processing of the white balance of the image color. Near infrared light or near infrared and visible light superposition supplementary lighting is used for even frames to extract brightness information of images, then image chromaticity information of adjacent odd frames and brightness information of even frames are fused to form a new frame of image, and after all frames shot every second are fused, 25 clear color images are finally output.

The video monitoring method further comprises the following steps: respectively carrying out image processing on the shot odd frame pictures and the shot even frame pictures;

respectively converting the odd frame picture and the even frame picture into YUV formats; the YUV format is a color coding method (belonging to PAL) adopted by european television systems, which is a color space adopted by PAL and SECAM analog color television systems, and its luminance signal Y and chrominance signal U, V are separated, so that it is convenient for the pixels of two adjacent frames of image information to be fused again to form a new picture frame.

Extracting UV components of odd frame pictures and Y components of even frame pictures; y denotes luminance, and U and V denote chrominance.

It can be understood that the color of the odd frame picture shot under the supplement of visible light is vivid, the brightness of the even frame picture shot under the near infrared light is good, and the chroma and the brightness information jointly determine the characteristics of the vivid picture, the definition of detail characteristics and the like.

To help understand the technical solution provided by the embodiment of the present invention, the above-mentioned image fusion process is illustrated as follows: when odd frames (1.3.5.7.) are exposed, a visible light fill lamp device is turned on, Frame data of Frame1, Frame3, Frame5 and Frame7.. are collected, ISP (image Signal processor) processing and white balance correction are carried out on the obtained odd frames, the odd frames are converted into YUV format, and UV components are extracted and stored.

When even frames (2.4.6.8..) are exposed, the near-infrared fill light device is turned on, or in order to facilitate white balance correction, the visible light fill light device and the near-infrared fill light device are preferably turned on to fill light, Frame data collected are Frame2, Frame4, Frame6 and Frame8.. the Frame data are converted into YUV format through ISP processing, and Y components are extracted and stored.

Combining the UV component of the Frame1 Frame and the Y component of the Frame2 Frame to obtain a new Frame; all new frames form a clear color image.

Referring to fig. 12, a diagram of a fusion process and a final effect of forming a clear color image in a low-light environment at night according to an embodiment of the present invention is shown.

The foregoing specifically describes an implementation of monitoring and acquiring a clear color image in a low-illumination night environment according to an embodiment of the present invention, and it can be understood that the video monitoring method provided by the embodiment of the present invention can also be applied to a high-illumination day time; specifically, referring to fig. 1, the method further includesstep 102B: and when the ambient illumination is higher than a preset illumination threshold, shooting the monitoring area by adopting a low frame rate exposure mode. It can be understood that the high frame rate exposure mode and the low frame rate exposure mode have larger power consumption, and can easily obtain clear color images due to sufficient light in the daytime, so that when the ambient illumination is higher than the preset illumination threshold, the low frame rate exposure mode is adopted to shoot the monitoring area, so that clear color images can be obtained, and the energy consumption can be relatively saved.

In addition, it is understood that in an environment with sufficient daylight, the method further includes turning off the fill-in light device, and taking a picture with a low frame rate, for example, a 25-frame exposure mode, to save energy consumption.

In another optional embodiment, when the ambient illumination is higher than the preset illumination threshold, the single-pass filter is switched to pass through a single-band light, specifically, the single-band is visible light with a wavelength band of 400-680nm, so that interference of noise light can be avoided, and a clear color image can be formed.

The video monitoring method provided by the embodiment of the invention can shoot clear color images in a low-illumination environment at night, solves the problem of environmental light pollution of high-power light supplement equipment such as a traditional gas flash lamp and the like, and improves the image quality at night, thereby being beneficial to improving the accuracy of target detection and identification.

Example two

Referring to fig. 3, a video monitoring system according to an embodiment of the present invention is configured to perform a video monitoring method according to any one of the embodiments, including: the system comprises an image sensor 21, a control module 22 and a light supplementing device 23;

the image sensor 21 and the light supplement device 23 are respectively connected with the control module 22, and the light supplement device is used for providing illumination;

The specific implementation manner and technical effects of the video monitoring system provided by the embodiment of the invention are basically the same as those of the video monitoring method described in the first embodiment, and therefore, the implementation manner and the technical effects can be referred to each other, and are not repeated.

FIG. 4 is a block diagram of a dual-sensor dual-lens video surveillance system according to an embodiment of the present invention; as shown with reference to fig. 4, includes: the infrared imaging device comprises twolenses 1A, twoimage sensors 2A, animage processor 4A and the like, wherein one path ofimage sensor 2A senses visible light imaging, the other path ofimage sensor 2A senses near-infrared imaging, the infrared imaging sensor can have strong infrared light sensitivity, an optical filter 3A is generally required to be added in front of the visible light sensor for only sensing visible light, and finally, the images of the two paths of sensors are fused through theimage processor 4A to output a clear color image.

However, the dual-lens dual-sensor video monitoring system needs a precise optical system, specifically: because the image signals of different paths are processed respectively, in order to ensure the fusion processing effect of subsequent images, the optical center and the images need to be calibrated during production or installation, which is inconvenient; in addition, the fields of view of the two lenses are different, the fusion algorithm is complex, and the cost of the two lenses of the two sensors is relatively high.

FIG. 5 is a block diagram of a dual-sensor single-lens video surveillance system according to another embodiment of the present invention; referring to fig. 5, in the dual-sensor single-lens video monitoring system, light entering a lens is divided into near-infrared light and visible light by an optical element, such as a beam splitter prism, two image sensors vertically disposed are used to obtain a near-infrared image and a color image, and the near-infrared image and the color image are fused to obtain the color image in a low-illumination environment.

However, the single-lens dual-sensor system, like the system with the aforementioned structure, also requires a precise optical system, requires an additional beam splitter prism between the lens and the sensor, increases the distance between the sensor and the lens, requires a customized rear-focus large lens, increases the cost accordingly, and also requires correction of the optical center and the image center of the dual sensor, which is inconvenient.

FIG. 3 is a block diagram of a video surveillance system according to an embodiment of the present invention; in order to solve the above problem, referring to fig. 3, a video monitoring system according to an embodiment of the present invention includes one image sensor, the number of the image sensors is one, a lens is disposed in front of the image sensor, and a filter assembly of the switchable filter is disposed between the image sensor and the lens.

The embodiment of the invention adopts the single sensor, the single lens and the switchable optical filter component, and the light channel of the switchable optical filter component is switched to supplement the light with the corresponding wave band in the low-illumination environment, so that the optical structure is simple, the development is easy and the cost is low; images acquired by the single lens and the single sensor are convenient for subsequent fusion processing, the fusion algorithm is simple and efficient, clear color images can be output after fusion, and based on the description of the first embodiment, the environment light pollution can not be caused.

In an optional embodiment of the present invention, the light supplement device includes a visible light supplement lamp and a near-infrared supplement lamp;

and if the control module determines that the frame number is odd, the visible light supplementary lamp is turned on to supplement the visible light with the wave band of 400-680nm to the monitoring area.

The image sensor is a sensor based on a BAYER format; referring to fig. 6 to 8, according to the photosensitive characteristic parameters of light with different wavelength bands, the embodiment of the present invention utilizes the photosensitive capability of the image sensor in the near infrared wavelength band of 900nm to 1000nm, and the QE conversion rate (photosensitive capability) of R, G, B reaches 30% in the near infrared wavelength band of 900nm to 1000nm, and the QE conversion rate of R, G, B is substantially the same in this range, so that the visible light with the wavelength band of 400-; in order to ensure that the wavelength band of the light entering the image sensor (i.e. the light sensed by the image sensor) is the above-mentioned wavelength band, a switchable optical device, in particular a filter assembly of a switchable filter, is added in front of the image sensor. The filter component of the switchable filter comprises a single-pass filter, one side of the single-pass filter is used for passing light with a single waveband, and the single-pass filter is used for transmitting visible light with 400-680nm waveband; one side is a double-pass filter for passing through two-band light, which is used for transmitting visible light in 400-680nm band and near infrared light in 900-1000nm band.

In addition, the ratio of light in the wavelength band of 700-840nm is more in the low-illumination environment at night, the part of light can influence the white balance of the image, and the optical single-pass and double-pass filter switchable component adopted by the system can prevent the part of light. Moreover, because the near-infrared light source (900 plus 1000nm) in the environment is very few, the system specifically adopts a near-infrared light supplement lamp, and the wave band of the emitted near-infrared light is controlled within the range of 900 plus 1000 nm; the specific implementation manner may be, for example: and a light outlet of the near-infrared light supplement lamp is provided with a filter film, and the filter film is used for transmitting light with a waveband of 900nm-1000 nm. Therefore, the light emitted by the near-infrared light supplement lamp can be controlled within the range of 900 plus 1000nm, and the optimal shooting effect at night can be realized.

Specifically, the single-pass filter is switched to in the daytime high-illuminance environment. And the optical filter is switched into a double-pass optical filter in a low-illumination environment at night, so that the fusion processing of visible light and near infrared light images is finally realized, and a clear color image is obtained.

Referring to fig. 3 and 10, in monitoring in a low light environment at night, as an embodiment, the system further includes an image processor connected to the image sensor;

the image processor receives the images shot by the image sensor and respectively processes the images of the shot odd frame images and the shot even frame images; respectively converting the odd frame picture and the even frame picture into YUV formats; extracting UV components of odd frame pictures and Y components of even frame pictures; y denotes luminance, and U and V denote chrominance. And merging the UV component and the Y component of the adjacent odd frame and even frame to obtain a new picture frame.

According to the scheme, the new picture frame is obtained by fusing the even frame with better image brightness information and the adjacent odd frame with better image chromaticity information, and the 25 clear color images are finally output, so that the better color image imaging effect under the low-illumination ambient light at night can be realized on a video control system with a single lens and a single sensor structure, the cost can be reduced, and the light pollution can be reduced or avoided.

In addition, the scheme of image fusion processing related to the embodiment can be applied to the fields of face recognition, military, industry, medicine and the like.

In this embodiment, when the ambient illuminance is lower than the preset illuminance threshold, the control module controls the motor assembly to switch to the two-pass filter for passing through the two-waveband light.

In still other embodiments, when the ambient illuminance is higher than the preset illuminance threshold, the control module is further configured to send a third control signal to the image sensor, so that the image sensor shoots the monitored area in the low frame rate exposure mode.

Referring to fig. 3, 9 and 11, in further embodiments, the system further comprises: the light filtering component of the switchable light filter is arranged in front of the image sensor and comprises a double-pass light filter for passing through double-waveband light, a single-pass light filter for passing through single-waveband light and a motor component for switching between the double-pass light filter and the single-pass light filter, and the motor component is connected with the control module; the switchable filter filtering assembly shown in fig. 9 includes two filters placed in the horizontal direction, namely a single-pass filter and a double-pass filter, which are installed in the frame, a micro motor and a horizontal motion connecting rod are arranged in the horizontal direction, the horizontal motion connecting rod is connected with the frame where the single-pass filter and the double-pass filter are installed, the connecting rod is driven to translate left and right by the rotation of the motor, so that the translation of the single-pass filter and the double-pass filter is realized, and the switching between the single-pass filter and the double-pass filter is realized. The switchable filter assembly is not limited to the structure shown in fig. 9, and a louver type switchable filter assembly may be used.

For example, in daytime, the ambient illumination is high, the light supplement device is turned off without light supplement, the light supplement device is switched to a single-pass filter, and a clear color image can be shot through visible light in the 400-plus 680nm wavelength band.

To enable monitoring of ambient illumination, the system further comprises: and the ambient illumination monitoring module is used for monitoring the real-time ambient illumination and sending the real-time ambient illumination to the control module.

Specifically, referring to fig. 3, the system further includes: and the output module is used for outputting the finally fused image for display. Application scenarios of embodiments of the present invention include, but are not limited to, the following examples:

the video image monitoring method and the video image monitoring system provided by the embodiment of the invention can shoot clear color images in a low-illumination environment and basically cannot cause light pollution. The traffic crossing monitoring system can be suitable for being used as an electronic police at a traffic crossing to monitor and obtain evidence of traffic violation vehicles, and can monitor whether drivers and passengers have illegal driving behaviors such as overload and overspeed or not, or signal lamps, mark lines and signs of the crossing and the like.

The embodiment of the invention can also be used for monitoring whether vehicles passing through a bidirectional single-lane gate and a multi-lane gate violate or not, and can carry out multi-azimuth shooting and tracking of a driving path on the vehicles passing through the lane gates.

The embodiment of the invention can also realize the snapshot of the illegal behaviors such as bus special lanes, forbidden cars of the innermost lanes of the expressway and the like.

The embodiment of the invention can also be used for tracking all vehicles in the panoramic tracking gas station, outputting the vehicle track at the same time, calibrating the parking position of the oiling machine, automatically matching the system, and analyzing the parking information, the oiling information and the like of the oiling vehicle; the first image sensor and the second image sensor capture and recognize bidirectional vehicles, the bidirectional vehicles are switched into the single-pass filter under the condition of normal gas station illumination, license plate numbers, vehicle body colors, vehicle types and the like can be recognized without starting light supplement equipment, and information is intelligently analyzed.

The embodiment of the invention can also be used for monitoring roadside parking, and is responsible for tracking and positioning vehicles in one area aiming at roadside parking, confirming the parking space where the vehicle stays, and identifying the license plate when the vehicle enters or exits the range.

It should be noted that, in the present specification, all the embodiments are described in a related manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Moreover, in this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The term "comprising", without further limitation, means that the element so defined is not excluded from the group consisting of additional identical elements in the process, method, article, or apparatus that comprises the element.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A video surveillance method, comprising the steps of:

2. The method of claim 1, wherein the supplementing the monitored region with light of a corresponding band according to frame ordinal number comprises:

3. The monitoring method of claim 2, further comprising: respectively carrying out image processing on the shot odd frame pictures and the shot even frame pictures;

4. The monitoring method of claim 1, further comprising: when the ambient illumination is lower than a preset illumination threshold value, switching to a double-pass filter for passing through the double-waveband light;

5. The monitoring method of claim 1, further comprising: and when the ambient illumination is higher than a preset illumination threshold, shooting the monitoring area by adopting a low frame rate exposure mode.

6. The method of claim 5, wherein the ambient illumination is higher than a predetermined illumination threshold, and switching is performed to pass a single pass filter for single band light.

7. A video surveillance system, comprising: the device comprises an image sensor, a control module and a light supplementing device;

8. The monitoring system according to claim 7, wherein the fill-in light device comprises a visible light fill-in light and a near-infrared fill-in light;

9. The monitoring system according to claim 8, wherein a light outlet of the near-infrared fill light is provided with a filter for transmitting light in a wavelength range of 900nm to 1000 nm.

10. A monitoring system according to claim 8 or 9, further comprising an image processor connected to the image sensor;