关键词: Harris算子, 角点检测, 曲线拟合, 自由度

Abstract: Improving the precision of corner detection can get higher precision of image registration in image mosaics.An improved Harris-based corner detection algorithm is presented in the paper.It makes curve fitting to the RHarris values of all pixels in every line on x-direction and every column on y-direction of the image respectively based on the Harris algorithm.And then，the curve is analyzed.When the RHarris value of a certain pixel is at the wave peak position on both x and y direction，it is detected as a corner.The experiments show that this method can avoid corners redundancies or loss brought by uncorrected threshold selection effectively and improve the precision of corners detection.

Key words: Harris operator, corner detection, curve fitting, degree of freedom