Multiscale keypoint analysis with triangular biorthogonal wavelets via redundant lifting

This paper presents an efficient approach for multiscale keypoint detection based on triangular biorthogonal wavelets. The detection scheme is simple and thus fast as only three isotropic directional components of an image obtained by multiscale decomposition with the triangular biorthogonal wavelets are used for keypoint localization at each scale. Redundant lifting is also considered and can be applied directly to calculate cumulative local energy distribution that is derived from the correction of the three directional components at each scale. This gives the efficient and accurate localization of keypoints including scale information. An experimental result shows that our method is better in the sense of the uniform distribution of keypoints compared with the conventional wavelet-based approach.