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| 4d-plugin-phash | ||
| =============== | ||
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| This plugin is a 4D implementation of the [pHash] (http://www.phash.org/) open source perceptual hash library. | ||
| It can compute and compare the perceptual hashes of PNG, BMP and JPEG files. | ||
| You can use it, for example, to search similar images of different file types stored in your database. | ||
| Image hash based on [pHash](http://www.phash.org/). | ||
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| ##Platform | ||
| ### Platform | ||
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| | carbon | cocoa | win32 | win64 | | ||
| |:------:|:-----:|:---------:|:---------:| | ||
| |🆗|🚫|🆗|🆗| | ||
| ||<img src="https://cloud.githubusercontent.com/assets/1725068/22371562/1b091f0a-e4db-11e6-8458-8653954a7cce.png" width="24" height="24" />|<img src="https://cloud.githubusercontent.com/assets/1725068/22371562/1b091f0a-e4db-11e6-8458-8653954a7cce.png" width="24" height="24" />|<img src="https://cloud.githubusercontent.com/assets/1725068/22371562/1b091f0a-e4db-11e6-8458-8653954a7cce.png" width="24" height="24" />| | ||
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| Commands | ||
| --- | ||
| ### Version | ||
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| ```c | ||
| // --- Compute | ||
| PH_Compute_DCT | ||
| <img src="https://user-images.githubusercontent.com/1725068/41266195-ddf767b2-6e30-11e8-9d6b-2adf6a9f57a5.png" width="32" height="32" /> | ||
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| // --- Compare | ||
| PH_Compare_MH | ||
| PH_Compare_RADISH | ||
| PH_Compare_DCT | ||
| ``` | ||
|  | ||
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| __Note__: Audio and Video files are not supported. | ||
| #### Supported image formats | ||
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| __Note__: If you create the PNG on Mac OS, make sure the "simple file" option is NOT used. Otherwise the hash value will be zero. | ||
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| Examples | ||
| ------- | ||
| ``` | ||
| $fileA:=Get 4D folder(Current Resources folder)+"2004Cogs.jpg" | ||
| $fileB:=Get 4D folder(Current Resources folder)+"2004Cogs.bmp" | ||
| $fileC:=Get 4D folder(Current Resources folder)+"2004Cogs.png" | ||
| $statusA:=PH Compute DCT ($fileA;$hashA)//3726390674172847513 | ||
| $statusB:=PH Compute DCT ($fileB;$hashB)//3726390674172847513 | ||
| $statusC:=PH Compute DCT ($fileC;$hashC)//3726390674172847513 | ||
| $fileD:=Get 4D folder(Current Resources folder)+"4D-main.jpg" | ||
| $statusD:=PH Compute DCT ($fileD;$hashD)//2732728107267830226 | ||
| $fileE:=Get 4D folder(Current Resources folder)+"4D-main.png" | ||
| $statusE:=PH Compute DCT ($fileE;$hashE)//2732728107267830226 | ||
| $distance1:=PH Compare DCT ($hashA;$hashB)//0 | ||
| $distance2:=PH Compare DCT ($hashA;$hashD)//26 | ||
| $sigma:=1 | ||
| $gamma:=1 | ||
| $N:=180 | ||
| $pcc:=0//peak of cross correlation | ||
| $pcc1:=PH Compare RADISH ($fileA;$fileB;$sigma;$gamma;$N)//0.9999931960446829526 | ||
| $pcc2:=PH Compare RADISH ($fileA;$fileC;$sigma;$gamma;$N)//0.9999931960446829526 | ||
| $pcc3:=PH Compare RADISH ($fileB;$fileC;$sigma;$gamma;$N)//1 | ||
| $alpha:=2 | ||
| $lvl:=1 | ||
| $hamming_distance:=0 | ||
| $hamming_distance1:=PH Compare MH ($fileA;$fileB;$alpha;$lvl)//0.01215277777777777797 | ||
| $hamming_distance2:=PH Compare MH ($fileA;$fileC;$alpha;$lvl)//0.01215277777777777797 | ||
| $hamming_distance3:=PH Compare MH ($fileB;$fileC;$alpha;$lvl)//0 | ||
| ``` | ||
| * png | ||
| * jpeg | ||
| * tiff |