Rapid detection method for straight line in digital image

A rapid detection method for a straight line in a digital image comprises steps of wavelet promotion transformation, binarization processing, straight line transformation and detection by using improved Hough, straight line parameter reduction and the like, and can rapidly extract characteristic information of the straight line from the digital image. The method is characterized by strong disturbance resistance capacity, insensitivity on margin discontinuity and the like and also has the advantages of good real time, little occupied internal memory and the like, and can be applied to the detection of object margin characteristics based on machine vision.