Abstract：Aiming at scene image’s character

a method to extract feature point in scene image based on chain-code technique is proposed. Firstly an improved chain-code technique is introduced to represent scene image’s contour. Secondly using the invariability of chain code’s reconstruction

the image’s dominating contour is reconstructed simultaneously the information of noise and detail is wiped off

and then the dominating contour’s chain code is gained using the same method. Then all kinds of features are extracted from the chain code

including the end of border

the center of shape

the point of crossing and main corner point. Finally experiments show that the proposed method is effective for extracting feature point

and has capability of anti-jamming and compressing information.