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Image noise reduction method and device
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An image noise reduction, image technology, applied in the field of image processing, can solve the problem of noise reduction without color noise
Pending Publication Date: 2022-04-12
上海宇思微电子有限公司
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[0006] The embodiment of the present invention provides an image noise reduction method and device, which aims to solve the problem that in special cases, the general image noise reduction technology mainly performs noise reduction on the texture details of the image, and does not specifically perform noise reduction on color noise, but in some In environmental scenes, color noise often has a greater impact on the display effect of the image
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Embodiment 1
[0034] refer to Figure 1-4 .
[0035] S1, perform the binning operation on the last frame image according to the block of 16x16, obtain the Pixel average value of each block, a total of N, N=(image width / 16)*(image height / 16), store in the ram;
[0036] S2. Calculate the probability PRO0 of the current frame image Pixel in the flat area. Specifically, perform gradient calculations on the current frame image in 4 directions, take n points in the vertical gradient direction, and calculate the average value to obtain P0 and P1, and use P0 and P1 to calculate the gradient of the current direction; the gradients of the four directions take the maximum value and map to the probability map to obtain the flat area probability PRO0;
[0037] S3, perform bilateral filtering on the current frame image Pixel to obtain PIXcur; at the same time, perform interpolation on the previous frame image Binning to obtain N points to obtain PIXref, specifically, perform bilateral filtering on the c...
Embodiment 2
[0042] refer to Figure 1-4 .
[0043] In S1, the image is divided into H parts at intervals of 16 in the horizontal direction, that is, H=width / 16, and divided into V parts at intervals of 16 in the vertical direction, that is, V=height / 16. A total of N=H*V 16x16 blocks are obtained. Accumulate the PIX in each block, and divide the final accumulated value by 256 to obtain the binning operation result, namely PIX avg =Σ PIX / 256, write the obtained N points into ram.
Embodiment 3
[0045] refer to Figure 1-4 .
[0046]In S2, calculate the probability PRO0 that the Pixel of the current frame image is in the flat region, specifically, perform gradient calculations on the current frame image in four directions. The gradient calculation takes n points in the vertical gradient direction, calculates the average value, and obtains P0 and P1, and uses P0 and P1 to calculate the gradient in the current direction; for example, to calculate the gradient in the vertical direction, n is 5, and the current Pixel coordinates are (11, 8), the P0 point needs 5 points to calculate the average value, and the coordinates of the 5 points are Pix(8,6), Pix(8,7), Pix(8,8), Pix(8,9), Pix(8 , 10); P1 needs 5 points to calculate the average value, and the coordinates of 5 points are Pix(12, 6), Pix(12, 7), Pix(12, 8), Pix(12, 9), Pix(12 , 10), get the gradient |P0-P1| in the vertical direction. Calculate the gradients of the remaining 3 directions in the same way, and take th...
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Abstract
The invention is applicable to the technical field of image noise reduction, and provides an image noise reduction method, which comprises the following steps of: performing binning operation on a previous frame of image according to a 16 * 16 block size, storing obtained points in ram, calculating a probability PRO0 of a current frame of image Pixel in a flat region, performing bilateral filtering on the current frame of image Pixel, and obtaining PIXcur; meanwhile, interpolation is carried out on points obtained through binning of the previous frame of image, and PIXref is obtained; the PIXcur and the PIXref are utilized to calculate a non-scene change probability PRO1, and bend operation is carried out to obtain a final noise reduction result; through probability calculation, Blend operation is carried out on two frames of Pixel, so that time domainnoise reduction is carried out, 2D double-sideband filtering is combined, a 3D noise reduction effect is achieved, and color noise reduction can be carried out on an image.
Description
technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an image noise reduction method and device. Background technique [0002] Many devices in the current consumerelectronics field have a shooting function, and the image effect obtained by shooting has gradually become an important criterion for judging the quality of consumerelectronics products. [0003] However, images are inevitably accompanied by noise interference during the capture, processing and transmission process. Most of the current image noise reduction methods are aimed at the noise reduction of texture details. The noise filter designed based on this, due to the limitation of the filter range, affects the effect of color noise reduction to a certain extent. [0004] There is an image noise reduction method and device in the prior art (CN 112435182A), which discloses an image noise reduction method and device. Wherein, the image includes a pl...
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