Multi-grade backlight detection method and device
A detection method and backlighting technology, which is applied to TVs, color TV parts, electrical components, etc., can solve the problems of inaccurately distinguishing the degree of backlighting, overexposure, underexposure, etc., and achieve the effect of rich image details
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Embodiment 1
[0036] The method for multi-level backlight detection includes: S101: segment the target image into blocks, and obtain the brightness value of each image block; divide the image to be detected into M*N image blocks, such as image 3 The block diagram of the image of the present invention shown, or with a certain fixed size block m*n (with the image center as the reference, the incomplete blocks are evenly distributed on the boundary), the brightness range is 0 ~ 255, using the existing Various image block brightness calculation methods are used to calculate the brightness of each image block, such as the cumulative sum of the brightness of each pixel point to calculate the average value, etc. Those skilled in the art can know that any other deformations that can be obtained without labor creation are within the scope of this embodiment.
[0037] S102: The detailed analysis method includes but is not limited to the square or absolute value of the difference between each point i...
Embodiment 2
[0046] Parts in this embodiment that are the same as those in Embodiment 1 will not be repeated, and different parts will be mainly described in this embodiment. Such as Figure 6 Shown is an evaluation value statistical diagram of an embodiment of the present invention, said S103 synthesizes the evaluation values of all image blocks to obtain the overall image backlighting degree; further, counts the number of image blocks with different evaluation values to obtain an evaluation value statistical diagram, for all The number of image blocks corresponding to each evaluation value in the statistical graph is weighted and summed, and the backlight degree of the image is obtained according to the backlight degree mapping table. The specific formula is
[0047]
[0048] where w i is the weight, N i is the number of corresponding brightness blocks.
[0049] The Score represents the degree of overexposure and underexposure of the current image, that is, the backlight evalu...
Embodiment 3
[0051] The device for implementing the above-mentioned multi-level backlight detection method includes: an image adjustment unit 201, which divides the target image into blocks, and obtains the brightness value of each image block; The mapping table converts the luminance value of each image block into the luminance evaluation value of the image block; the image calculation unit 203 synthesizes the evaluation values of all image blocks to obtain the overall image backlight degree; the image processing unit 204 guides the exposure selection according to the backlight degree HDR compositing provides a suitable image.
[0052] The image adjustment unit 201 divides the target image into blocks, and obtains the brightness value of each image block; divides the image to be detected into M*N image blocks, such as image 3 The block diagram of the image of the present invention shown, or with a certain fixed size block m*n (with the image center as the reference, the incomplete bloc...
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