Application of Hough transform in detection of circuit board
Jia Cui · Tianjin Gongye Daxue xuebao · 2008
The problem of the image of the circuit board everytime collected from the auto-detection system exist parallel motion and circumrotatory warp was researched.This auto-detection system aim at the minimum system circuit board which model is DSP56F801.The rectificatory algorithm used in the image of the circuit board based on the hough transform was advanced.Firstly,in this algorithm the edge detect arithmetic operators was used to get the edge image of the image of circuit board,aim at the characteristic of the circuit board which location of the orientation holes is fixed,hough transform was used to detect the location of circular outer edge of the orientation holes of the circuit board.Then the parallel locomotor warp and circumrotatory warp of the circuit board can be computed and rectified based on the centre of the outer edge of the orientation holes.Finally,the algorithm was validated use the image of the circuit board actual collected.The experimental results indicate that this algorithm can eliminate the parallel locomotor warp and circumrotatory warp of image of the circuit board collected from the auto-detection system.