In existing methods of ceramic tile online classification and detection, some kinds of texture are hard to quantify and it is also difficult to classify by color or gray scale. To solve the problem, first of all, the method based on Gaussian filter has been used to enhance texture and remove low-amplitude noise. And then, it is able to extract and process the features in frequency domain by the discrete fourier transform. Moreover, by removing the DC component and high- frequency components, texture has bee...