White balance adjusting method
An adjustment method and white balance technology, applied in the field of white balance adjustment, can solve problems such as missing selection, wrong selection, and large white point error, so as to reduce the large error of white point selection, improve robustness and accuracy, and improve The effect of choosing flexibility
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Embodiment 1
[0064] (1) Get as figure 2 The color fringe image shown has a width of 1920 and a height of 1080. The horizontal direction is composed of eight color stripes on average, and the vertical direction is within the same color stripe. The color remains unchanged, but the brightness gradually decreases from top to bottom. , consisting of eight grayscale changes. The colors of the eight color bars from left to right are white [250, 250, 250], blue [0, 0, 250], green [0, 250, 0], red [250, 0, 0], light blue [0, 250, 250], black [0, 0, 0], rose red [250, 0, 250] and yellow [250, 250, 0], each color The grayscale change coefficient from top to bottom in the bar is [255 / 255, 192 / 255, 160 / 255, 128 / 255, 96 / 255, 64 / 255, 32 / 255, 16 / 255], the RGB image conversion To YCbCb image, that is to use one of the conversion methods in the color space conversion formula to convert, but not limited to this method, such as CCIR601 and so on.
[0065] (2) According to the luminance component Y, in the ...
Embodiment 2
[0122] (1) Get as image 3 For the Lena color image shown, the width of the color image is 512, and the height is 512. Convert the RGB image to the YCbCb image, that is, use a conversion method in the color space conversion formula, but not limited to this method, such as CCIR601 Wait.
[0123] (2) According to the luminance component Y, in the YCbCr space, the YCbCr image is divided into a plurality of luminance level areas; the steps of dividing the YCbCr image into a plurality of luminance level areas are as follows:
[0124] (21) Construct a 256x256 two-dimensional matrix P, the value of each pixel in the matrix is the same, and its value range is an integer from 0 to 255, construct a 256x256 two-dimensional matrix Q, the value of each column in the matrix is from 0 to 255 sheets, construct a 256x256 two-dimensional matrix R, the value of each row in the matrix is from 0 to 255 sheets, P={p ij}, p ij =k, where k∈[0 255], Q={q ij},q ij =j,R={r ij}, r ij =i, i, ...
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