Edge detection on object color

In this paper a novel scheme for color edge detection is presented to minimize the false edge detection caused by specular reflection. The method is based on the dichromatic reflection model proposed by Shafer (1985) to describe the object reflection properties in the HSV color space, and is different from existing color edge detection techniques in three major aspects. First, our analysis accounts for multiple light sources and is less restrictive than techniques which are based on the assumption of single light source. Second, we have incorporated the V-component on top of the hue H to include the shading information which is absent in the latter. This effectively added in a new dimension in separating the regions which are similar in hue, but different in shade. Third, we had discovered that a single color edge operator is inadequate for detecting discontinuities in all conditions with equal precision. The V-component, for example, is more relevant than H in describing the edge contour when S is low, and vice versa. In between these two extremes, both components are found to have equal significance