Perspective Image Rectification Based on Improved Hough Transformation and Perspective Transformation

When the images collected from camera have perspective distortion,it can affect the following work such as feature extraction and object recognition due to the influence of perspective projection.When rectifying these distorted images,perspective transformation can change the relative position of inner points,while affine transformation cannot.This article will improve the Hough transformation to find the lines that hold the four points which perspective transformation needs,and then use the perspective transformation to rectify the distortion based on the imaging principle of cameras.Emulation experiment results from Matlab reveal that the algorithm can effectively rectify the distorted images and achieve our expectation.This algorithm is easy,feasible and robust,and can be applied to many fields including object recognition.