radial image perceptual hash
2012-12-23 23:58
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Radial Image Hash
paper:Robust image hashing based on radial variance of pixelswork flow:
1.cvsmooth
2.convert cartesian coordinates to log polar coordinate
3.get the varience to captures image discontinuities
4.get radial variance vector
5.do DCT transfrom
6.get the most important DCT coefficient
7.generate hash value
代码实现比较容易,opencv提供了很多方便的函数,比如cvLogPolar,cvSubS, cvReduce,cvDCT
![](http://img.my.csdn.net/uploads/201212/24/1356278532_4137.jpg)
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