The image segmentation method based on smoothing filter and gray compensation is proposed to eliminate the redundant background of the X-ray image of the radial tire,which is caused by the low contrast,noise and background fluctuation.Firstly,the smoothing filter is introduced to eliminate the belt and noise of tire X-ray image.The second step is to correct the gray of pixels according to the proportion relationship between the mean of whole image and neighborhood mean of each pixel.Finally,the binarization...