In the process of color image edge detection

it is very difficult for the extraction of detail edges in the areas with low illumination.A novel method of color image edge detection based on modified visual perception model is proposed in this paper.Because hue component is represented by circular data

it easily leads to the false edges.Firstly

we use hue distance to calculate the gradient of hue component

and then use non-linear function whose variant is saturation to control the change of gradient of hue component.Finally

the edges of color image can be detected by computing vector gradient in modified visual perceptual model.Experimental results show that the proposed method can obtain higher accuracy of edge detection than the existing approaches.Especially

the proposed method has a good response for edge details in areas with low illumination.