Image Lines Feature Extraction with Sub-pixel

The method of image line feature extract with high precision was studied based on the significance of line feature extraction in image measurement.A new mixed algorithm was proposed and the procedure that was taken in the algorithm can be divided into two steps.First the lines were extracted with improved Hough transform,the lines segment and its end were obtained.Then the self-adaptation line template was produced based upon initial value of lines segment's end.Matching template with the line feature of image by the method of least squares image matching,the line feature with sub-pixel was realized.The results with simulative and real data show that the algorithm is robust and its precision can achieve to sub-pixel level.It can improve the precision of the image measurement effectively.