Self-adaptation of tilted knitted fabric image

The tilting probability is tremendous when collecting knitted fabric images. It will bring mistakes, even errors, when calculating longitude density and latitude density, etc. In allusion to this problem, this paper presents an algorithm which can automatically rectify the tilted knitted fabric image based on its own characteristic, Fourier Transform and coordinate rotation formula. This algorithm can both solve the tilting problem and calculate the longitude density at the same time.