Abstract：An algorithm for color image segmentation and particles size distribution was proposed to solve the problem in oil exploration,which was core image segmentation being difficult to effectively identify the edge information between particles as well as particles and the background whose gray values were similar and likely to cause over-segmentation or less-segmentation.The results were compared with the segmentation results of gray iteration algorithm,maximum entropy method and watershed algorithm.The results show that the color image segmentation is based on the color information V component of the huesaturation-value(HSV) model.Correcting segmentation results in a more complicated background can be realized.The border of object and background with similar color can be accurately segmented.The particle distribution of gravel and silt particles can be obtained.

Keywords：core;image segmenta tion;hue-saturation-value model;threshold