Straight line detection is still a challenging task in image processing. Though many methods have been put forward

before, most of them have some limitations. In this paper, we propose a novel method for straight line detection based on

chain codes. Different the former methods based on chain codes, this method doesn’t rely too much on the

Freeman’s criteria. A more robust and reasonable criterion is adopted for detection, and an algorithm is presented to

make this criterion works. Then we seek for a solution to the problem of corner points locating error that exists in all the

chain codes tracking methods. We also suggest a criterion for correcting corner points, and present a strategy which can

save computation time. The results show that our method has better performance than the traditional methods.

Keywords: straight line detection, corner points correction, chain codes-Straight line detection is still a challenging task in image processing. Though many methods have been put forward

before, most of them have some limitations. In this paper, we propose a novel method for straight line detection based on

chain codes. Different　the former methods based on chain codes, this method doesn’t rely too much on the

Freeman’s criteria. A more robust and reasonable criterion is adopted for detection, and an algorithm is presented to

make this criterion works. Then we seek for a solution to the problem of corner points locating error that exists in all the

chain codes tracking methods. We also suggest a criterion for correcting corner points, and present a strategy which can

save computation time. The results show that our method has better performance than the traditional methods.

Keywords: straight line detection, corner points correction, chain codes