Brightness adaptive cross-screen display method and device applied to spliced display

Abstract

The application discloses a brightness adaptive cross-screen display method and device applied to a spliced display and belongs to the cross-screen display field.The method comprises the following steps: acquiring the display area average brightness of each spliced screen in real time; taking the gray value of the video stream in the reference screen as the reference, the video stream gray value transmitted to other spliced screens is dynamically adjusted according to the display area average brightness difference between each spliced screen and the reference screen, so that the picture between the spliced screens is smooth.The four dark corner photoreceptors around the spliced screen are utilized to measure the brightness of the spliced picture covered area on the spliced screen in real time, the gray value of the video stream of each spliced screen is dynamically adjusted based on the information, the screen display picture fragmentation caused by the brightness difference of different spliced screens is balanced, the influence of the spliced screen difference and the brightness change of the image itself on the cross-screen picture is reduced, the effect is better, the requirement of the screen hardware is lower, and a new idea is provided in the case that the screen control cannot solve the spliced brightness difference.

Description

Technical Field

[0001] The present invention belongs to the field of cross-screen display, and more specifically, relates to a brightness-adaptive cross-screen display method and device applied to a spliced ​​display. Background Art

[0002] Large-screen display systems are typically composed of several tiled screens, which often produce seams during the splicing process, and brightness differences between different panels can also vary. Because these seams and brightness differences can only be determined after on-site installation, and given the large number of display units, manual adjustment is labor-intensive. Furthermore, due to production variability, it can be difficult to adjust screen brightness to the same range for all screens.

[0003] Patent CN113744686A discloses an automatic brightness adjustment system for an LED splicing screen, including a CPU, several under-screen sensors, several off-screen edge sensors, a dot matrix allocation processing module, a screen controller, an automatic adjustment module and an optimization module. The system can automatically adjust the brightness of the LED splicing screen according to the brightness of the external environment to meet the situation where the screen display is not clear or bright enough in different brightness environments. At the same time, in the process of calculating the optimal brightness value, an automatic adjustment module and an optimization module are added. The screen brightness has the function of self-adjustment and optimization update. It can be adjusted and updated according to the needs of people of different ages and physical conditions, solving the problem that the system-set automatic adjustment of the screen brightness cannot meet the needs of different groups of people.

[0004] However, this method has the following defects and shortcomings: it automatically adjusts the brightness of the spliced ​​screen according to the brightness of the external environment, and directly adjusts the brightness of the screen, but the screen brightness adjustment range is greatly limited, and sometimes it is difficult to achieve a uniform adjustment effect, especially when there are a large number of spliced ​​screens. It is more difficult to adjust and keep the screen brightness within a smaller range; and this adjustment method adjusts the entire brightness of a single screen, and cannot achieve the effect of smooth brightness transition at the seam between two screens. Summary of the Invention

[0005] In response to the defects of the prior art, the purpose of the present invention is to provide a brightness-adaptive cross-screen display method and device for spliced ​​displays, aiming to solve the problems of inconsistent screen brightness in the spliced ​​screen system and large brightness differences in the spliced ​​screen caused by the splicing seams, and the obvious splicing seams causing the picture across the two screens to be uneven and have a noticeable sense of fragmentation.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a brightness adaptive cross-screen display method applied to a spliced ​​display, the method comprising:

[0007] S1. Real-time acquisition of the average brightness of the display area of ​​each spliced ​​screen;

[0008] S2. Based on the average brightness difference of the display area between each splicing screen and the reference screen, and taking the grayscale value of the video stream in the reference screen as a reference, dynamically adjust the grayscale value of the video stream transmitted to other splicing screens to make the picture between each splicing screen smooth.

[0009] Preferably, step S1 includes:

[0010] S11 real-time acquisition of the screen brightness values ​​of the four corners of each spliced ​​screen, to obtain the distance between the four corners and the screen;

[0011] S12. Normalize the four brightness values ​​according to the distances between the four corners and the screen to obtain the average brightness of the display area.

[0012] Preferably, the four angular brightness values ​​are multiplied by a coefficient K i =D i / L, then add and average to get the normalized brightness value; where L is the distance from the four corners to the center of the screen, D i is the distance between the four corners and the screen, i=1,2,3,4.

[0013] Preferably, the reference screen is selected in the following manner:

[0014] The screen with the largest coverage area of ​​the spliced ​​screen will be used as the reference screen. If the areas are the same, the screen with the lower average brightness will be used as the reference screen.

[0015] Preferably, the criteria for smoothing the images between the spliced ​​screens are as follows:

[0016] Get the brightness values ​​of two adjacent screens. If the absolute value of the brightness difference divided by the brightness value of the higher brightness screen is less than the difference threshold, stop the iteration process. If the brightness value exceeds the difference threshold again, repeat the iteration steps until the iteration stops.

[0017] To achieve the above-mentioned object, in a second aspect, the present invention provides a brightness-adaptive cross-screen display device for a spliced ​​display, the device comprising: a processor and a memory;

[0018] The processor is used to store computer-executable instructions;

[0019] The processor is configured to execute the computer-executable instructions so that the method described in the first aspect is performed.

[0020] To achieve the above-mentioned object, in a third aspect, the present invention provides a spliced ​​display, comprising: a plurality of spliced ​​display screens and a brightness-adaptive cross-screen display device as described in the second aspect.

[0021] Preferably, the spliced ​​display further comprises: a plurality of groups of dark corner photoreceptors, each group of four dark corner photoreceptors, for obtaining screen image brightness values ​​at four corners of each spliced ​​screen.

[0022] Preferably, the spliced ​​display further includes:

[0023] An image splicing unit is used to crop and splice the spliced ​​screen video stream after image adjustment to obtain a video image with smooth brightness transition;

[0024] There are splicing decoding devices corresponding one to one with the splicing screens. Each splicing decoding device is used to adjust the size and position of the output screen according to the splicing instructions, and decode and display the final image.

[0025] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0026] The present invention provides a brightness-adaptive cross-screen display method and device for spliced ​​displays. The method uses four dark corner sensors around the spliced ​​screen to measure the brightness of the area covered by the spliced ​​image on the spliced ​​screen in real time. Based on this information, the grayscale value of the video stream of each spliced ​​screen is dynamically adjusted to balance the sense of fragmentation of the display images between screens caused by the brightness differences of different spliced ​​screens, and reduce the impact of the differences in spliced ​​screens and the brightness changes of the image itself on the cross-screen images. The method has good effects and low requirements for screen hardware. It can be applied to various types such as LED LCD spliced ​​screens, OLED self-luminous LCD spliced ​​screens, and DLP rear-projection spliced ​​screens. In the case where screen control cannot solve the difference in spliced ​​brightness, a new idea is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a brightness-adaptive cross-screen display device for a spliced ​​display provided by the present invention.

[0028] Figure 2 This is a schematic diagram of a spliced ​​display provided by the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Figure 1 Schematic diagram of a brightness adaptive cross-screen display device for splicing displays provided by the present invention. Figure 1 As shown, the device includes: a screen brightness acquisition unit, a screen brightness real-time calculation unit, a screen brightness information transmission unit, a video brightness adjustment unit, an image splicing unit and a decoding and display unit.

[0031] The same video stream captured by each splicing screen is cropped, amplified, and displayed across multiple screens after processing by the splicing decoding device. This creates a unified image across multiple splicing screens. However, inconsistent brightness between the splicing screens can exacerbate the effect of image tearing when the splicing is performed. By obtaining the brightness of different splicing screens and the grayscale value of the display itself, the grayscale value of the video stream on each splicing screen is adjusted. The video stream changes in real time, requiring real-time adjustment of the video stream grayscale value.

[0032] The present invention obtains brightness information through a screen brightness acquisition unit composed of dark corner photosensors installed at the four corners of the screen.

[0033] Figure 2 Schematic diagram of a spliced ​​display provided by the present invention. Figure 2 As shown, obtaining the actual brightness of a single spliced ​​screen includes the following steps:

[0034] 1a) The screen brightness is measured by the vignetting sensors distributed around the screen;

[0035] 1b) Transmit the brightness to a brightness calculation and stream processing device.

[0036] The screen brightness real-time calculation unit multiplies the distance between the center of the spliced ​​image and the four dark corner sensors by the corresponding coefficient to obtain the normalized image brightness. The screen brightness information transmission unit transmits the normalized image brightness to the video brightness adjustment unit.

[0037] like Figure 2 As shown, brightness adjustment includes the following steps:

[0038] 2a) The brightness calculation and stream processing device obtains the position of the display image on the screen to obtain the distance between the image and the dark corner sensor.

[0039] 2b) The brightness values ​​of the four photoreceptors are normalized according to the distance between the display screen and the dark corner photoreceptor, and then the average brightness value is calculated to obtain the screen brightness of the display area.

[0040] Preferably, the four angular brightness values ​​are multiplied by a coefficient K i =D i / L, then add and average to get the normalized brightness value; where L is the distance from the four corners to the center of the screen, D i is the distance between the four corners and the screen, i=1, 2, 3, 4.

[0041] 2c) The brightness calculation and stream processing device adjusts the grayscale value of the video stream according to the screen brightness, selects one of the spliced ​​screens as a benchmark, and adjusts the grayscale value of the video stream transmitted to other screens based on the grayscale value of the video stream itself and the brightness difference of each spliced ​​screen.

[0042] 2d) Obtain screen brightness information again and repeat the above steps until the image between screens transitions smoothly.

[0043] Preferably, the criteria for smoothing the images between the spliced ​​screens are as follows:

[0044] Obtain the brightness values ​​of two adjacent screens. If the absolute value of the brightness difference divided by the brightness value of the higher-brightness screen is less than a difference threshold, the iteration process stops. If the brightness value exceeds the difference threshold again, the iteration process is repeated until the iteration stops. In this embodiment, the difference threshold is 1.5%.

[0045] The reference screen is selected according to the range of the spliced ​​screen covered by the picture, and the one with the largest coverage area is used as the reference. If the areas are the same, the one with the lower average brightness is used as the reference.

[0046] The video brightness adjustment unit adjusts the grayscale value of each splicing screen video stream according to the normalized brightness information, and the image splicing unit crops and splices the splicing screen video stream after picture adjustment to obtain a video picture with smooth brightness transition, and then the decoding display unit displays the image on the splicing screen.

[0047] The splicing decoding device adjusts the size and position of the output image according to the splicing instructions, and decodes and displays the final image.

[0048] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A brightness adaptive cross-screen display method applied to a spliced ​​display, characterized in that: The method includes: S1. Real-time acquisition of the average brightness of the display area of ​​each spliced ​​screen, wherein obtaining the average brightness of the display area of ​​a single spliced ​​screen includes the following steps: S11. Use the dark corner sensors installed at the four corners of the screen to obtain the screen brightness values ​​of the four corners of each spliced ​​screen in real time. Use the brightness calculation and stream processing equipment to obtain the position of the display image on the screen and obtain the distance between the four corners and the screen. ; S12. Based on the distance between these four corners and the picture , after normalizing the four brightness values, calculate the average brightness to obtain the average brightness of the display area of ​​the spliced ​​screen; The brightness values ​​are normalized as follows: multiply the four corner brightness values ​​by the coefficients ; in, is the distance from the four corners to the center of the screen, The distance between the center of the stitched image and the four vignetting sensors. ; S2. Based on the average brightness difference of the display area between each splicing screen and the reference screen, and taking the grayscale value of the video stream in the reference screen as a reference, dynamically adjust the grayscale value of the video stream transmitted to other splicing screens to make the picture between each splicing screen smooth.

2. The method according to claim 1, wherein The reference screen is selected in the following manner: The screen with the largest coverage area of ​​the spliced ​​screen will be used as the reference screen. If the areas are the same, the screen with the lower average brightness will be used as the reference screen.

3. The method according to claim 1, wherein The criteria for smooth images between the spliced ​​screens are as follows: Get the brightness values ​​of two adjacent screens. If the absolute value of the brightness difference divided by the brightness value of the higher brightness screen is less than the difference threshold, stop the iteration process. If the brightness value exceeds the difference threshold again, repeat the iteration steps until the iteration stops.

4. A brightness adaptive cross-screen display device applied to a spliced ​​display, characterized in that: The device comprises: a processor and a memory; The processor is used to store computer-executable instructions; The processor is configured to execute the computer-executable instructions so that the method according to any one of claims 1 to 3 is performed.

5. A spliced ​​display, characterized in that: include: A plurality of spliced ​​display screens and a brightness-adaptive cross-screen display device as claimed in claim 4.

6. The spliced ​​display according to claim 5, wherein: The spliced ​​display further includes: a plurality of groups of dark corner photoreceptors, each group of which includes four dark corner photoreceptors, for obtaining screen image brightness values ​​at the four corners of each spliced ​​screen.

7. The spliced ​​display according to claim 5, wherein: The spliced ​​display further includes: An image splicing unit is used to crop and splice the spliced ​​screen video stream after image adjustment to obtain a video image with smooth brightness transition; There are splicing decoding devices corresponding one to one with the splicing screens. Each splicing decoding device is used to adjust the size and position of the output screen according to the splicing instructions, and decode and display the final image.

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