Abstract: In order to improve the over-segmentation in the traditional watershed algorithm,a watershed segmentation algorithm of gradient hierarchical reconstruction was proposed under opponent color space,considering the interference of reflected light on the image.Firstly,the color image is converted from RGB space to the opponent color space which has nothing to do with the reflected light.Secondly,the gradient image of the color image is obtained by combining the image information entropy.Thirdly,the gradient image is hierarchically reconstructed according to the distribution information of the gradient histogram.Then morphological minimum calibration technique is used to calibrate the combined gradient image.At last,watershed segmentation is applied to the corrected image.Experiments on different types of images were carried out.The experimental results show that the proposed algorithm is more prominent than the three classic watershed algorithms in the number of divided regions,running time and the DIR.The new algorithm is more in line with human perception of the image,the segmentation and performance are better,and it has higher robustness and practicality.

Key words: Gradient layered, Image segmentation, Morphological reconstruction, Opponent color space, Watershed