haozi5205
haozi5205
/ ImagePHash.java
Created
January 6, 2017 07:38
— forked from kuFEAR/ImagePHash.java
Android image phash comparing
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| package com.example.app; | |
| import android.graphics.*; | |
| import android.util.Log; | |
| /* | |
| * pHash-like image hash. | |
| * Author: Elliot Shepherd (elliot@jarofworms.com | |
| * Based On: http://www.hackerfactor.com/blog/index.php?/archives/432-Looks-Like-It.html | |
| */ |
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| public class pHash { | |
| /** | |
| * pHash算法流程 | |
| * 1.缩小图片，最佳大小为32*32 | |
| * 2.转化成灰度图 | |
| * 3.转化为DCT图 | |
| * 4.取dct图左上角8*8的范围 | |
| * 5.计算所有点的平均值 | |
| * 6.8*8的范围刚好64个点，计算出64位的图片指纹，如果小于平均值记为0，反之记为1，指纹顺序可以随机，但是每张图片的指纹的顺序应该保持一致 |