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An improved SIFT algorithm, based on Canny operator and Hillbert Huang transform is put forward. Canny operator can effectively avoid the edge response but there will be a smooth transition and shift of the edge. We utilize Hillbert-Huang transform to enhance image contour. Then we propose an improved SIFT algorithm based on Canny operator and Hillbert-Huang transform. We compare the feature points extracted with original SIFT algorithm; we compare the feature points with the improved SIFT algorithm, which are smaller in number than those extracted with the original SIFT algorithm, eliminating unsatisfactory feature points and this giving better accuracy rates in Fig.l:19.7% in the first case, 18.06% in the second case, and 19.43% in the third case.

An Improved SIFT Algorithm Based on Canny Operator and Hillbert - Huang Transform