Fred's ImageMagick Scripts



    Licensing:

    Copyright © Fred Weinhaus

    My scripts are available free of charge for non-commercial use, ONLY.

    For use of my scripts in commercial (for-profit) environments or non-free applications, please contact me (Fred Weinhaus) for licensing arrangements. My email address is fmw at alink dot net.

    If you: 1) redistribute, 2) incorporate any of these scripts into other free applications or 3) reprogram them in another scripting language, then you must contact me for permission, especially if the result might be used in a commercial or for-profit environment.

    Usage, whether stated or not in the script, is restricted to the above licensing arrangements. It is also subject, in a subordinate manner, to the ImageMagick license, which can be found at: http://www.imagemagick.org/script/license.php

PHASHCOMPARE


Compares two 168 digit phash strings to compute a phash metric.

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last modified: July 21, 2015



USAGE: phashcompare "phash1" "phash2"

PURPOSE: Computes the phash metric using 168 digit phash strings from two images.

DESCRIPTION: PHASHCOMPARE computes the phash (perceptual hash) metric using 168 digit phash strings from two images.

NOTE: see phashconvert to generate the 168 digit string for a given image.

CAVEAT: No guarantee that this script will work on all platforms, nor that trapping of inconsistent parameters is complete and foolproof. Use At Your Own Risk.



Example

Original Images Used To Generate The PHASH Strings Via PHASHCONVERT

PHASH String
(168 digits with no breaks)

006200400558016804020230048102210974044807760310092505270049002003050156030801620336 015706590318050402350734037100480053027803540303034103320375065207350506058107020794

PHASH String
(168 digits with no breaks)

006300550368036404960547046803160950076406540514103207610038003003030304041403500313 037107030732047305530684083200410047049903360429046903750374077709130624054508490795

Command

phash1="006200400558016804020230048102210974044807760310092505270049002003050156030801620336
015706590318050402350734037100480053027803540303034103320375065207350506058107020794"

phash2="006300550368036404960547046803160950076406540514103207610038003003030304041403500313
037107030732047305530684083200410047049903360429046903750374077709130624054508490795"

phashcompare "$phash1" "$phash2"

Metric Result

118.937