关键词: 图像匹配, 轮廓波变换, 方向滤波器组

Abstract: Compared with wavelet transform, a drawback of Laplacian Pyramid（LP） in contourlet transform is implicit oversampling and non-orthogonal decomposition. This paper proposes an improved contourlet transform, the proposed method derives wavelet coefficients of entry image by wavelet transform, then reconstructs the image only by lowpass coefficients and after processing it can derive a highpass subband. The proposed method keeps critical sampling and it’s convenient for direction filter banks to partition the highpass subbands. It is found that the rate of matching in improved contourlet transform domain is higher than that in wavelet transform and contourlet transform domain.

Key words: image matching, contourlet transform, directional filter banks