CN103426403A - Image acquisition method for calibration, picture display method and calibration method for LED display screen - Google Patents

Abstract

The invention provides an image acquisition method for calibration and picture display method for an LED display screen. The image acquisition method for calibration includes controlling an area to be calibrated of the LED display screen to display a calibrating reference picture for acquiring a calibrating reference image to reflect the influence degree of a picture displayed by the LED display screen by environment light during image acquisition; controlling the area to be calibrated of the LED display screen to display a calibrating picture for acquiring an initial image for calibration; utilizing the calibrating reference image to remove influences contained by the initial image for calibration by the environment light. The invention further provides an LED display screen calibration method by adopting the acquisition method. By the aid of the image acquisition method for calibration and picture display method for the LED display screen, the calibrating reference picture is displayed and captured during the process of acquiring the image for calibration to acquire the calibrating reference image for reflecting the influence degree by the environment light, the calibrating reference image can used for weakening or removing the influence on the display picture by the environment light in the process of image acquisition, so that good calibrating effect on the LED display screen can be achieved even though the environment light is strong.

Description

Image-pickup method, picture display process and the bearing calibration for correction of LED display

Technical field

The present invention relates to the alignment technique field of LED display, be specifically related to a kind of image-pickup method, picture display process and bearing calibration for correction of LED display.

Background technology

The LED display point-to-point correction system, coordinated by " control system " and " point-to-point correction system " two systems, and wherein point-to-point correction system is responsible for " generation correction coefficient ", and control system is responsible for " application correction coefficient ".The picture that corrective system shows LED display by mm professional camera special is taken pictures with the acquisition correction image, obtains brightness and the color of each LEDs, for each pixel, generates correction coefficient, then correction coefficient is given to control system and preserves.Control system, when operation, for the picture material of each pixel, completes multiplying at a high speed with correction coefficient, thereby completes pointwise correction.

Yet, existing LED display is proofreaied and correct the collection with image, mostly carry out at night or in darkroom, because the surround lighting in evening or darkroom is zero substantially, less with the brightness disturbing effect of image to the correction collected, the correction also collected is the intrinsic brilliance that equals the picture that display screen shows basically with the brightness of image, and therefore outdoor field engineer can directly gather after the monochrome such as red, green, blue of LED or pure color image to analyze and obtain the pixel correction coefficient.But for example,, at dusk, in daytime or the situation that exists other surround lightings (street lamp) to disturb, because ambient light interference is larger, may proofread and correct or calibration result can descend greatly.

Summary of the invention

The technological deficiency existed for overcoming prior art, the invention provides a kind of image acquiring method, picture display process and bearing calibration for correction of LED display, can weaken or remove ambient light interference to proofreading and correct the impact by image acquisition.

Particularly, the correction image acquiring method of a kind of LED display that the embodiment of the present invention provides, comprise step: the zone to be corrected of controlling LED display shows the calibration reference picture, for collecting rectified reference image, the annoyance level of surround lighting to the picture of the zone to be corrected demonstration of LED display during described rectified reference image reflection image acquisition; The zone to be corrected of controlling LED display shows proofreaies and correct picture, for collecting to proofread and correct, uses initial pictures; And utilize the rectified reference image removal to proofread and correct the ambient light interference comprised with initial pictures and obtain required correction image.

In addition, the picture display process of a kind of LED display that the embodiment of the present invention provides, comprise step: the appointed area in LED display shows reference picture, for collecting reference picture, the annoyance level of the picture that when wherein the reference picture representative image gathers, surround lighting shows the LED display appointed area; And show monochrome or pure color picture in the appointed area of LED display, for collecting initial pictures, thereby can utilize reference picture to remove the ambient light interference that initial pictures comprises.

In addition, the bearing calibration of a kind of LED display that the embodiment of the present invention provides comprises step: utilize above-mentioned correction to obtain required correction image with image acquiring method; And utilize the correction got to generate the correction coefficient of a plurality of LED pixels of LED display with image.

As from the foregoing, the present invention is proofreading and correct with controlling LED display demonstration calibration reference picture in image acquisition procedures and being collected rectified reference image by image capture device, this rectified reference image reflection ambient light interference degree, therefore utilize this rectified reference image can effectively weaken or remove the interference of surround lighting to display frame in image acquisition process, thereby in the situation that surround lighting is more intense still can realize LED display calibration result preferably.

By the detailed description below with reference to accompanying drawing, it is obvious that other side of the present invention and feature become.But it should be known that the only purpose design for explaining of this accompanying drawing, rather than, as the restriction of scope of the present invention, this is because it should be with reference to additional claim.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.

The accompanying drawing explanation

Fig. 1 is the process flow diagram that image acquiring method is used in the correction of a kind of LED display of the embodiment of the present invention.

Embodiment

For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.

Refer to Fig. 1, the process flow diagram of image acquiring method for the correction of its a kind of LED display that is the embodiment of the present invention.Below in conjunction with Fig. 1, the correction of the embodiment of the present invention is elaborated with image acquiring method.

Particularly, the correction of the embodiment of the present invention comprises the following steps S110 to step S170 with image acquiring method.

Step S110: control the to be corrected regional demonstration location picture of LED display, for collecting the location image, and determine that zone to be corrected is in the position of locating in using image.Particularly, location can be any display frame with picture, only has and zone to be corrected and its neighboring area can be made a distinction and get final product; At this, zone to be corrected can be the viewing area of whole LED display, can be also other appointed areas, the viewing area that for example one or more casings are corresponding, viewing area corresponding to one or more LED lamp plates.

Step S130: the zone to be corrected of controlling LED display shows the calibration reference picture, for collecting rectified reference image, and the annoyance level of surround lighting to the regional picture shown to be corrected of LED display when wherein rectified reference image reflects image acquisition.In the present embodiment, the collection of rectified reference image can by image capture device for example mm professional camera special realize, be specially after image capture device is aimed to zone to be corrected and set parameter the calibration reference picture taken, thereby obtain rectified reference image.Usually, when for follow-up monochrome of carrying out different colours or pure color, proofreading and correct picture and taken, the parameter that image capture device is used can be different, and for example, for taking red-correction picture and green correction picture, the parameter that image capture device is used can be different; Therefore, the value of parameter used herein is decided by the color of the correction picture of follow-up demonstration.Parameter setting example herein arranges time shutter and/or the aperture size of image capture device in this way.In addition, preferably, the calibration reference picture is black picture, and like this, the brightness of the rectified reference image collected just can be thought the brightness that is equal to surround lighting, is also the ambient light interference amount; Certainly, the calibration reference picture also can approach for brightness the low gray scale picture of black picture, for example brightness value is less than 10% picture of the highest picture brightness, in such cases, the brightness meeting of rectified reference image approaches the brightness of surround lighting basically, and it also can think the annoyance level that has reflected surround lighting to a certain extent.

Step S150: the zone to be corrected of controlling LED display shows proofreaies and correct picture, for collecting to proofread and correct, uses initial pictures.Proofread and correct and completed by above-mentioned image capture device with the collection of initial pictures herein, and the parameter value used when the parameter value that the image capture device acquisition correction is used during with initial pictures and above-mentioned acquisition correction reference picture is consistent, and could effectively improve calibration result like this.Correction picture herein is such as being the pure color pictures such as the sprite such as red, green, blue or white.It is worth mentioning that, for sprite, mainly refer to that in zone to be corrected, solid color LED is lit presented picture, for the pure color picture, mainly refer in zone to be corrected that two kinds and two or more color LED are lit the picture that back mixing light presents.

Step S170: utilize the rectified reference image removal to proofread and correct the ambient light interference comprised with initial pictures and obtain required correction image.Specifically can be: the correction software of being installed by the correcting computer that connects image capture device will be proofreaied and correct the brightness value that deducts respectively respective pixel view data in rectified reference image with the brightness value of each pixel image data in initial pictures, thereby obtain the pixel image data of required correction with image, also obtain required correction image.

It should be noted that, for above-mentioned correction, the sequencing of the step S110 in image acquiring method, S130 and S150 does not limit, and can suitably change, and it can realize that the present invention weakens or remove the purpose of ambient light interference equally.In addition, also can omit step S110, adopt manual type to determine the position of zone to be corrected in the image collected.

It is worth mentioning that, in above-mentioned correction, with in image acquiring method, can relate to the picture display process of LED display, taken for image capture device to demonstrate required picture.In simple terms, the picture display process of the embodiment of the present invention can roughly be summarized as following steps: the appointed area in LED display shows reference picture, for collecting reference picture, the annoyance level of surround lighting to the picture of the appointed area demonstration of LED display during described reference picture reflection image acquisition; And show monochrome or pure color picture in the appointed area of LED display, for collecting initial pictures, thereby can utilize reference picture to remove the ambient light interference that initial pictures comprises.

In addition, for realizing brightness and/or the chromaticity correction to the zone to be corrected of LED display, be configured to example (but the present invention is not as limit) with the single led pixel in LED display by red (R), green (G), blue (B) three color LED, can first carry out above-mentioned steps S110 to S170 and obtain red LED correction image, perform step again afterwards S130 to S170 and obtain green LED correction image, and then execution step S130 to S170 obtains blue led correction image; Can obtain like this red, green, blue three-color LED correction image.Afterwards, red, green, blue three-color LED that the correction software utilization in correcting computer gets is proofreaied and correct the correction coefficient of each LED pixel that can generate the zone to be corrected of LED display with image, for example brightness and/or chromaticity correction coefficient.At this, it is worth mentioning that, in obtaining the red, green, blue three-color LED correction use process of image, the parameter that image capture device is used is understood different and need to be adjusted accordingly.

In sum, the above embodiment of the present invention is being proofreaied and correct with controlling LED display demonstration calibration reference picture in image acquisition procedures and being collected rectified reference image by image capture device, this rectified reference image reflection ambient light interference degree, therefore utilize this rectified reference image can effectively weaken or remove the interference of surround lighting to display frame in image acquisition process, thereby in the situation that surround lighting is more intense still can realize LED display calibration result preferably.

Applied specific case herein principle and the embodiment of image acquiring method, picture display process and the bearing calibration for correction of LED display of the present invention are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention; all will change in specific embodiments and applications; in sum, this description should not be construed as limitation of the present invention, and protection scope of the present invention should be as the criterion with appended claim.

Claims (10)

1. the correction image acquiring method of a LED display, is characterized in that, comprising:

The zone to be corrected of controlling described LED display shows the calibration reference picture, for collecting rectified reference image, and the annoyance level of surround lighting to the picture of the zone to be corrected demonstration of described LED display during described rectified reference image reflection image acquisition;

The zone described to be corrected of controlling described LED display shows proofreaies and correct picture, for collecting to proofread and correct, uses initial pictures; And

Utilize described rectified reference image remove the ambient light interference that described correction comprises with initial pictures and obtain required correction image.

2. correction image acquiring method according to claim 1, is characterized in that, described calibration reference picture is black picture or low gray scale picture.

3. correction image acquiring method according to claim 1, is characterized in that, described correction picture is sprite or pure color picture.

4. correction image acquiring method according to claim 1, is characterized in that, utilizes described rectified reference image to remove the ambient light interference that described correction comprises with initial pictures and obtain required correction and comprise by the step of image:

Described correction is deducted respectively to the brightness value of respective pixel view data in described rectified reference image with the brightness value of each pixel image data in initial pictures, and then obtain required correction image.

5. correction image acquiring method according to claim 1, is characterized in that, also comprises step:

The zone described to be corrected of controlling described LED display shows the location picture, for collecting the location image; And

Determine the position of zone described to be corrected in the use image of described location of described LED display.

6. the picture display process of a LED display, is characterized in that, comprises step:

Appointed area in described LED display shows reference picture, for collecting reference picture, and the annoyance level of surround lighting to the picture of the appointed area demonstration of described LED display during described reference picture reflection image acquisition; And

Described appointed area in described LED display shows monochrome or pure color picture, for collecting initial pictures, thereby can utilize reference picture to remove the ambient light interference that described initial pictures comprises.

7. picture display process according to claim 6, is characterized in that, described reference picture is black picture or low gray scale picture.

8. picture display process according to claim 6, is characterized in that, described picture display process is applied to brightness and/or the chromaticity correction of a plurality of LED pixels of described LED display.

9. the bearing calibration of a LED display, is characterized in that, comprises step:

Utilize correction as described as claim 1 to 5 any one to obtain required correction image with image acquiring method; And

The correction that utilization gets generates the correction coefficient of a plurality of LED pixels of described LED display with image.

10. bearing calibration according to claim 9, is characterized in that, described correction coefficient is brightness and/or chromaticity correction coefficient.

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