A weighted local structured Hashing(WLSH)method is proposed to address the problem in the field of image retrieval that most existing Hashing methods only consider the global information and treat each projected dimension equivalently
which leads to a problem that the binary codes cannot efficiently preserve the data similarity. The proposed method considers local structure information of original image data and the variance of each projected dimension simultaneously. An affinity weight matrix is built to describe the relationship between data points and to acquire local structure information of the original image data. Then
an iterative quantization is used to find an optimal orthogonal transformation matrix and to minimize the quantization error. Finally
a weighted matrix is used to balance the variances and to guarantee equivalent information of each Hashing bits
thus the data similarity is effectively preserve. Experimental results based on some large scale datasets show that the precision and recall of the WLSH algorithm are improved by 3% and 2% over principal component analysis-iterative quantization
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