Image processing algorithms solving the problem that residual products contained in injection molding machines molds by comparing the image to be detected with background images directly.But because each time the light condition and stop place of the moving mold are different

the image to be detected and the background images are different on light and position

so errors of existing algorithms are big.To solve the above problem

an image detection method of injection molding machine mold residual products based on light and position compensation is proposed

to realize light compensation by adjusting the mean and variance of the images and realizes position compensation by getting the outer border of the moving mold and aligning.Mold image monitoring and alarming system based on PC is built based on the proposed algorithm and experimental results show that the system has high detection accurate rate.