Background: Aiming at the characteristics of PCB photoelectric image which have
ambiguity and noise, a circle detection method of PCB photoelectric image based on improved Hough
transform is proposed.
Methods: Firstly, the basic principle of circle detection based on traditional Hough transform algorithm
is discussed, and its disadvantages are pointed out. Secondly, the basic principle of circle detection
method based on improved Hough transform is analyzed in detail, and it has some advantages such as
smaller amount of data and faster speed.
Results: Lastly, in order to prove the correctness of the basic principle analysis, a real experiment of
PCB photoelectric image circle detection is actualized, both the subjective results and the objective
results verify the superiority of the method.
Conclusion: By using the method, the edge information obtained is the best and the computed time is
the shortest in these methods mentioned in the experiment.