Legacy ImageMagick Discussions Archive

I have a forum on which users often upload images with watermark of our competitors, I would like to search for the logo on the image and replace or cut it.

I know that ImageMagick has an option called subimage-search, but i had no luck with it

what I've tried so far:

compare -subimage-search logo.png sub.png similarity.png
compare -subimage-search -metric rmse large_image.png sub-image.png result.png
compare -subimage-search -metric pae large_image.png sub-image.png result.png
compare -subimage-search -metric ncc large_image.png sub-image.png result.png

I have a forum on which users often upload images with watermark of our competitors, I would like to search for the logo on the image and replace or cut it.

I assume your competitors watermark their image for this reason.

If anything you should be removing the image rather than removing the watermark.

What version of IM and platform? -subimage-search was added at version 6.6.3-6

I have used successfully for quite some time now, the following syntax.

compare -metric rmse -subimage-search large_image.png sub-image.png result.png

That should produce two result.png images, -0 and -1. The second one will be the similarity image.

see
http://www.imagemagick.org/script/comma ... age-search
http://www.imagemagick.org/Usage/compare/
http://www.imagemagick.org/script/compare.php
viewtopic.php?f=1&t=14613&p=51076&hilit ... ric#p51076 (though current versions of IM now require the addition of -subimage-search)

Perhaps you should post links to your two images so others can test.

fmw42 wrote:What version of IM and platform? -subimage-search was added at version 6.6.3-6

I have used successfully for quite some time now, the following syntax.

compare -metric rmse -subimage-search large_image.png sub-image.png result.png

That should produce two result.png images, -0 and -1. The second one will be the similarity image.

see
http://www.imagemagick.org/script/comma ... age-search
http://www.imagemagick.org/Usage/compare/
http://www.imagemagick.org/script/compare.php
viewtopic.php?f=1&t=14613&p=51076&hilit ... ric#p51076 (though current versions of IM now require the addition of -subimage-search)

Perhaps you should post links to your two images so others can test.

Thanks for replay.
I'm using:
Version: ImageMagick 6.7.7-10 2012-08-27 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC

The images:

sub-image to search

image to replace with


results:



I can see the two results images, but i don't know how to move forward and replace with

There should be some output to the terminal that tells you the rmse error, its values scaled to the range 0 to 1 (in parenthesis) and the x,y coordinates of the best match, all in that order. Use the x,y coordinates to composite the new image at the same x,y location.


convert image newsmallimage -geometry +X+Y -compose over -composite result

see
http://www.imagemagick.org/Usage/layers/#convert

Worked! Thanks a lot you are the man

This I don't think can be classed as a watermark. It is probbaly better classed as SPAM advertising, and you just wanted to replace that spam with your own spam.

A true watermark would be very hard to locate and replace, as it is a distortion of the color values rather than a bold and obvious overlay. Direct sub-image searches of real watermarks would be very difficult.

And even in the frequency domain, it would probably be very hard to locate, though probably easier than for direct sub-image searches.