关键词: 特征提取, 识别, Radon变换, 声纳图像, 扇束投影

Abstract: The method of projection is used to feature extraction and recogniton of the underwater acoustic images obtained by sonar imaging. After discussing the characteristics of Radon transform and fan-beam projection respectively, a new method using Radon transform for underwater acoustic image’s feature extraction and classification is proposed,which is non-sensitive to the ambiguous noise.After getting the close edge by morphological edge extraction and thinning operators ,we construct the edge moment invariants based on Radon projection and use them in classification of three kinds of underwater objects. Simulation results show the proposed method is robust and its effectiveness are better than Hu’s moment invariant and object’s plane moment invariance in Radon projective space according to the computing speed.

Key words: feature extraction, recognition, Radon transform, sonar image, fan-beam projection