A method for defining color distance in RGB color space is proposed. Based on the color distance, the Roberts gradient operator is used to obtain the color distance histogram and determine the threshold of the image edge information. The edge information of the image is obtained by using this threshold through the Roberts operator. This method fully considers the color information in the image. Compared with the grayscale image processing method, it reduces the amount of calculation and improves the success rate of extracting edge information between different colors with similar brightness.
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