Binocular parallax 3D-based LED spliced display methodTechnical Field
The invention belongs to the technical field of 3D display, and relates to an LED spliced display method based on binocular parallax 3D.
Background
In the field of 3D display technology, shutter type 3D display technology has become the dominant choice for home entertainment, cinema, and gaming applications. The principle of this technique is to achieve alternating display of left-eye and right-eye pictures by increasing the picture refresh rate, for example, to 120 Hz. Specifically, the LED display screen alternately shows left eye images and right eye images, and the active 3D glasses worn by the viewer are internally designed with a control chip, and the chip is synchronized with the frame frequency transmitter through a high-frequency signal of 2.4GHz, so that the left and right photoelectric lenses are controlled to be alternately transparent and opaque at the same frame frequency to match the image switching on the display screen. When the left eye image is displayed, the left lens is transparent and the right lens is opaque, ensuring that only the left eye is able to see the image, and vice versa. When the switching is performed more than 50 times per second, the human brain can integrate the images received by the two eyes into a stereoscopic image, so that a 3D effect is generated.
However, while shutter 3D technology has achieved some success in providing an immersive visual experience, it still faces some challenges. For example, in fast scene switching, flicker and ghost phenomena are liable to occur due to insufficient refresh rate and low synchronization accuracy, which seriously affect the visual experience of 3D viewing. In addition, the prior art has the defects in the aspects of multi-channel input processing and picture splicing accuracy, and high-quality multi-channel display is difficult to realize. Regional 3D display configuration techniques are still in the start-up phase, lacking sophisticated solutions and flexible control systems. There is still a gap between the high refresh rate display technology and the synchronous control technology at home and abroad, especially in the high refresh rate display technology and the stable synchronous control signal. Therefore, there is a need to develop a new 3D display technology to overcome the limitations of the related art and provide a higher quality 3D display effect.
Disclosure of Invention
Object of the Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention aims to provide the binocular parallax 3D-based LED spliced display method, which realizes the 3D display effect of high refresh rate and high precision synchronization, and simultaneously provides multi-channel input processing and flexible regional 3D display configuration so as to meet diversified display requirements and promote user experience.
Technical proposal
In order to achieve the above purpose, the following technical scheme is adopted:
A binocular parallax 3D-based LED spliced display method comprises the following steps:
(1) Receiving an input image signal having an original frame frequency fin =60 Hz;
(2) The frame frequency of an input image signal is increased to fout＝2×fin =120 Hz by utilizing a frequency multiplication algorithm, signals alternately displayed by left and right eyes are generated, and an adaptive refresh rate adjustment mechanism is introduced, wherein the mechanism can monitor scene dynamics in real time and adjust refresh rate so as to reduce visual discomfort during rapid scene switching;
(3) The LED video stitching equipment and the image processing unit are utilized to synchronously transmit left and right eye switching signals to the 3D synchronous transmitter according to a frame synchronization algorithm, the algorithm ensures synchronization error difference Esync≤1/fout, and the image processing unit improves the accuracy of picture stitching;
wherein the brightness adjustment is based on the following formula that the brightness L of each region is expressed as the product of the base brightness Lo and the adjustment coefficient k, l=k×l0;
The color correction is based on the following formula that the color correction is realized through a correction matrix M, the color C of each region is calculated through the following formula that C=MXCoriginal, wherein Coriginal is an original color vector, M is a 3X 3 color correction matrix, and the independent correction of red, green and blue channels is realized by adjusting elements in the matrix;
(4) The 3D synchronous transmitter converts the signals into signals for controlling synchronous switching of the photoelectric lenses of the active 3D glasses according to a synchronous control algorithm, wherein the algorithm comprises a synchronous delay SD and a synchronous window SW, and the requirement that SW is more than or equal to SD+1/fout is met;
(5) High-precision synchronous control of the active 3D glasses is realized by using a 2.4GHz high-frequency signal, and the synchronous precision error delta phi meets delta phi <2 lambda, wherein lambda is the wavelength of the 2.4GHz signal.
Further, the frame synchronization algorithm includes:
(a) Determining an input frame frequency fin and a target frame frequency fout;
(b) Calculating a frame interval ratio fr=fout/fin;
(c) According to the frame interval ratio, performing frame insertion or frame discarding on the input signal to match the target frame frequency to satisfy
Fr×fcin＝FCout, where FCin is the number of input signal frames and FCout is the number of output signal frames.
Further, the synchronization control algorithm includes:
(i) Receiving a left-right eye switching signal from video splicing equipment, and defining an initial synchronization point of the signal as t0;
(ii) Adjusting the time sequence of the signal according to a preset synchronous control parameter;
(iii) Using a clock management unit to ensure that signals are sent to the 3D glasses within a preset synchronization window to meet t0+SD≤t<t0 +SD+SW, wherein t is the current synchronization point;
(iv) Monitoring and adjusting the synchronization state of the signals to compensate for possible timing deviations, satisfying |Deltat|++.sync, deltat being the synchronization timing deviation;
further, the picture stitching accuracy comprises color correction, brightness adjustment and edge fusion, so as to adapt to different display environments and requirements.
Further, in the step 3), the k value is adjusted according to the ambient lighting conditions or the user requirements, so as to adapt to different display requirements.
Further, the LED video stitching device can output monocular pictures with 4K resolution and fin frame frequency in 18 channels and input signals within 18 channels, the image processing time of each channel is less than or equal to 1/fin-∈proc,, eproc is the allowance of processing time, and in multi-channel input processing, the LED video stitching device uses a synchronous calibration algorithm to ensure the time sequence consistency among the input signals of each channel, introduces a dynamic time sequence adjustment mechanism, corrects the processing delay of different channels in real time, and ensures the time synchronization precision of the final stitched pictures.
Further, the video splicing equipment generates a stereoscopic picture with 4K resolution and fout frame frequency through serial port cascade connection, the time synchronization error in the splicing process is less than or equal to epsilonsync, the video splicing equipment has automatic color and brightness calibration function, the color and brightness difference output by each channel is detected in real time by using a sensor, the system can automatically adjust the output of each channel according to a preset calibration curve so as to achieve consistency of color and brightness, ensure that spliced pictures have no obvious splicing marks, eliminate transition lines among different splicing units by using an edge fusion algorithm through a transition processing technology, and improve consistency and consistency of the overall display effect.
Further, the 3D synchronization transmitter includes a synchronization control unit for ensuring that left and right eye images are synchronously switched with a photoelectric lens of the active 3D glasses, the synchronization accuracy satisfies Δt <1/2fout, the active 3D glasses includes a photoelectric sensor and a liquid crystal shutter, wherein the photoelectric sensor responds to a 2.4GHz high frequency signal to control opening and closing of the liquid crystal shutter.
Further, the LED video stitching device comprises at least one video stitching device, which is used for processing the signals of the input channel and generating a stereoscopic picture;
furthermore, the number of the 3D synchronous transmitters is more than or equal to 1, and the 3D synchronous transmitters are used for converting signals output by the LED video splicing equipment into signals for controlling the 3D glasses.
The method is further realized by the following system that the method further comprises a vision computer used for outputting a 3D video source with the frequency of 4K multiplied by 60Hz or 4K multiplied by 120Hz, the system comprises a central control management system, a user can freely select a specific area of a screen to perform 3D display through the central control management system, the size and the position of the area can be dynamically adjusted, diversified display requirements under different scenes are met, independent color and brightness settings are added on the 3D display configuration of the area, and the user can customize display parameters of different areas according to specific application scenes so as to achieve the best vision effect.
Further, the central control management system can quickly adjust the region configuration of the 3D display according to application requirements, the central control management system supports a user to freely define any region of the display screen through a software interface, the user can define the region needing 3D display in a dragging or coordinate input mode, each region can be accurate to a pixel level so as to ensure that different display requirements are met in a complex application scene, and the central control management system supports simultaneous definition of a plurality of independent 3D display regions. Each region may be configured with display parameters including brightness, contrast, color correction, and parallax parameters individually. This independent configuration function allows a plurality of different 3D contents to be presented on the same screen without interfering with each other.
Further, when 3D display is performed on multiple regions simultaneously, the central control management system provides a region edge smooth transition function, so that abrupt visual effects caused by parallax or depth difference between regions are avoided, 3D parameters of the region edges are adjusted during smooth transition, 3D contents of different regions are ensured to be continuous and natural visually, a transition region is defined between two adjacent 3D display regions, visual faults between different regions are eliminated through gradual adjustment of parallax and depth parameters, and the 3D effects of the whole screen are more uniform.
The application has the beneficial effects that:
(1) According to the invention, through an innovative high-refresh-rate shutter type 3D display technology, the frame frequency of an input image signal is increased to 120Hz, so that the image flickering and ghost phenomena are effectively reduced, a smoother and natural 3D visual experience is brought to a user, the accurate frame synchronization algorithm and the 3D synchronization transmitter are utilized, the interval release and synchronous switching of left and right eye pictures are ensured, and the active 3D glasses controlled by a 2.4GHz high-frequency signal are matched, so that the high-precision visual output synchronous with the same frequency of an LED display screen is realized, and the quality and the user experience of 3D display are greatly improved.
(2) According to the invention, by means of high-precision 3D picture splicing and multi-channel synchronous display technology, three-dimensional picture processing with resolution of up to 4K and frame frequency of 120Hz is realized by means of LED video splicing equipment and serial port cascading technology, the multi-channel input processing capability breaks through the bottleneck of the prior art, high-precision picture splicing and synchronization are realized, the instantaneity and continuity of pictures are ensured, a stable and high-quality 3D visual effect is provided for a user, meanwhile, a central control management function of the system allows the user to quickly adjust the 3D display area and mode according to different application scenes and requirements, and high application flexibility and operation convenience are provided.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present invention more clear, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the embodiments of the present invention. In the examples, the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The following examples are illustrative intended to illustrate the invention and are not to be construed as limiting the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following describes in detail the embodiments of the present invention.
Binocular parallax 3D-based LED spliced display method
The method comprises the following steps:
(1) Receiving an input image signal having an original frame frequency fin =60 Hz;
(2) The frame frequency of an input image signal is increased to fout＝2×fin =120 Hz by utilizing a frequency multiplication algorithm, signals alternately displayed by left and right eyes are generated, and an adaptive refresh rate adjustment mechanism is introduced, wherein the mechanism can monitor scene dynamics in real time and adjust refresh rate so as to reduce visual discomfort during rapid scene switching;
(3) The LED video stitching equipment and the advanced image processing unit are utilized to synchronously transmit left and right eye switching signals to the 3D synchronous transmitter according to a frame synchronization algorithm, the algorithm ensures synchronization error difference Esync≤1/fout, and the advanced image processing unit improves the accuracy of picture stitching, including color correction, brightness adjustment, edge fusion and the like, so as to adapt to different display environments and requirements;
The brightness adjustment is based on the following formula that the brightness L of each area can be expressed as the product of the basic brightness Lo and an adjustment coefficient k, wherein L=k×L0, k can be adjusted according to the ambient illumination condition or the user requirement, and k is E [0,2] so as to adapt to different display requirements;
The color correction is based on the following formula that the color correction can be realized through a correction matrix M, the color C of each region can be calculated through the following formula that C=M×Coriginal, wherein Coriginal is an original color vector, M is a3×3 color correction matrix, and the independent correction of red, green and blue channels can be realized by adjusting elements in the matrix;
(4) The 3D synchronous transmitter converts the signals into signals for controlling synchronous switching of the photoelectric lenses of the active 3D glasses according to a synchronous control algorithm, wherein the algorithm comprises a synchronous delay SD and a synchronous window SW, and the requirement that SW is more than or equal to SD+1/fout is met;
(5) High-precision synchronous control of the active 3D glasses is realized by using a 2.4GHz high-frequency signal, and the synchronous precision error delta phi meets delta phi <2 lambda, wherein lambda is the wavelength of the 2.4GHz signal.
The frame synchronization algorithm includes:
(a) Determining an input frame frequency fin and a target frame frequency fout;
(b) Calculating a frame interval ratio fr=fout/fin;
(c) According to the frame interval ratio, performing frame insertion or frame discarding on the input signal to match the target frame frequency to satisfy
Fr×fcin＝FCout, where FCin is the number of input signal frames and FCout is the number of output signal frames.
The synchronization control algorithm comprises:
(i) Receiving a left-right eye switching signal from video splicing equipment, and defining an initial synchronization point of the signal as t0;
(ii) Adjusting the time sequence of the signal according to a preset synchronous control parameter;
(iii) Using a clock management unit to ensure that signals are sent to the 3D glasses within a preset synchronous window, and meeting t0+SD≤t<t0 +SD+SW;
(iv) The synchronization state of the signals is monitored and adjusted to compensate for possible timing deviations, meeting |Deltat|+.esync.
The LED video stitching device can output monocular pictures with 4K resolution and fin frame frequency in 18 channels and input signals within 18 channels, the image processing time of each channel is less than or equal to 1/fin-∈proc,, Eproc is the allowance of processing time, the LED video stitching device uses a synchronous calibration algorithm in multi-channel input processing to ensure the time sequence consistency among the input signals of all channels, introduces a dynamic time sequence adjustment mechanism, corrects the processing delay of different channels in real time and ensures the time synchronization precision of the finally stitched pictures.
The video splicing equipment generates a stereoscopic picture with 4K resolution and fout frame frequency through serial port cascading, the time synchronization error in the splicing process is smaller than or equal to epsilonsync, the video splicing equipment has an automatic color and brightness calibration function, the color and brightness difference of each channel output is detected in real time by using a sensor, the system can automatically adjust the output of each channel according to a preset calibration curve so as to achieve consistency of color and brightness, the spliced picture is ensured to have no obvious splicing trace, and through a transition processing technology, a transition line between different splicing units is eliminated by using an edge fusion algorithm, and consistency of the whole display effect are improved.
The 3D synchronous transmitter comprises a synchronous control unit which is used for ensuring synchronous switching of left and right eye pictures and photoelectric lenses of the active 3D glasses, the synchronous precision meets delta t <1/2fout, the active 3D glasses comprise a photoelectric sensor and a liquid crystal shutter, and the photoelectric sensor responds to a 2.4GHz high-frequency signal to control opening and closing of the liquid crystal shutter.
The input channels are included in 18 and less than 18, and are used for receiving monocular pictures with 4K resolution;
The video splicing device is used for processing the signals of the input channels and generating a stereoscopic picture;
At least one 3D sync transmitter is included for converting a signal output from the video splicing device into a signal for controlling the 3D glasses.
The method is realized by the following system, which also comprises a vision computer used for outputting a 3D video source with the frequency of 4K multiplied by 60Hz or 4K multiplied by 120Hz, and comprises a central control management system, wherein a user can freely select a specific area of a screen to perform 3D display through the central control management system, and can dynamically adjust the size and the position of the area to meet the diversified display requirements under different scenes, and the method comprises the steps of adding independent color and brightness settings on the 3D display configuration of the area, and the user can customize the display parameters of different areas according to specific application scenes so as to achieve the optimal vision effect, for example, when demonstrating content, the user can set higher brightness for a main display area and lower brightness for surrounding auxiliary display areas so as to highlight key content.
The central control management system can quickly adjust the region configuration of the 3D display according to application requirements, the central control management system supports a user to freely define any region of the display screen through a software interface, the user can define the region needing 3D display in a dragging or coordinate input mode, each region can be accurate to a pixel level so as to ensure that different display requirements are met in a complex application scene, and the central control management system supports simultaneous definition of a plurality of independent 3D display regions. Each region may be configured with display parameters including brightness, contrast, color correction, and parallax parameters individually. This independent configuration function allows a plurality of different 3D contents to be presented on the same screen without interfering with each other.
When 3D display is carried out on a plurality of areas simultaneously, the central control management system provides an area edge smooth transition function, abrupt visual effects generated between areas due to parallax or depth difference are avoided, 3D parameters of the areas are adjusted during smooth transition, 3D contents of different areas are ensured to be continuous and natural visually, a transition area is defined between two adjacent 3D display areas, visual faults between different areas are eliminated through gradual adjustment of parallax and depth parameters, and the 3D effect of the whole screen is more uniform.
The user may set an independent brightness value for each 3D display area to ensure that the visibility of the display content is optimal under different ambient light conditions, e.g. the primary display area may be set to a high brightness while the secondary area is set to a lower brightness to avoid disturbing the visual focus of the viewer.
Each region supports independent color calibration, the system provides a plurality of preset color modes, and a user can manually adjust the color modes according to the needs to ensure that the 3D effect in different regions is bright in color and clear in level.
The system is provided with a real-time preview function, and when a user configures the 3D display areas, the user can view the effect in real time through monitoring software and make necessary adjustment, so that the user can ensure that each 3D display area meets the expected visual effect before deployment.
The system supports the automatic adjustment of the brightness and contrast of each 3D display area according to the change of the ambient light so as to adapt to the change of different time periods and the ambient light and keep the stability and consistency of the 3D display effect.
Furthermore, unless defined otherwise, technical or scientific terms used in the description of the application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," "outer," and the like as used in the description of the present application are merely used for indicating relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and that the relative positional relationships may be changed when the absolute position of the object to be described is changed, thus not being construed as limiting the application. The terms "first," "second," "third," and the like, as used in the description of the present application, are used for descriptive purposes only and are not to be construed as indicating or implying any particular importance to the various components. The use of the terms "a," "an," or "the" and similar referents in the description of the application are not to be construed as limiting the amount absolutely, but rather as existence of at least one. As used in this description of the application, the terms "comprises," "comprising," or the like are intended to cover an element or article that appears before the term as such, but does not exclude other elements or articles from the list of elements or articles that appear after the term.
It should be further noted that, unless explicitly stated or limited otherwise, terms such as "mounted," "connected," and the like, used in the description of the present application should be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, and in communication with each other, as would be understood by one skilled in the art in view of the specific meaning of the present application.
The foregoing description is only illustrative of the present invention and is not to be construed as limiting the invention, and any and all modifications, equivalent substitutions, improvements, etc. made by those skilled in the art using the teachings of the present invention may be made in other fields without departing from the spirit and scope of the invention.