摘要：针对景象图像的特点，提出了基于链码技术的景象图特征点的提取方法，并首先引进了一种新的链码技术对景象图像轮廓进行描述；然后利用链码的重构不变性重构图像的主要轮廓，以去除噪声和细节，并对其进行二次编码，以获取图像主要轮廓链码信息；最后在所得链码中提取各类特征点，包括轮廓边界的端点、形心、交叉点和显著拐点。实验结果表明，该方法不仅特征点提取效果好，而且信息压缩能力强、抗干扰能力强。

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.