Abstract: In order to make the color edge detector considering the discrimination of human eyes, avoiding the perceptually insigni?cant edges being over-detected, a novel color gradient based color-edge detection algorithm based on the adaptive perceptual color difference is proposed. A weighting factor including luminance masking effect and contrast sensitivity function is proposed, which combine the influence of local changes in luminance and spatial frequency to human visual system. The SNR and the quality factor Pratt of edge detection evaluation and the time complexity show that the proposed method can detect the color image edge accurately and against the effect of noise.