Search found 8 matches

by chani
2018-11-18T10:38:57-07:00
Forum: Users
Topic: How do you detect duplicates? And how does IM Fingerprint work?
Replies: 2
Views: 1895

Re: How do you detect duplicates? And how does IM Fingerprint work?

Okay, I wrote something which seems to work, based on what I did read about aHash. Here's the PHP Code: $im = new \Imagick($file); $im->sampleImage(16, 16); $im->transformImageColorspace(\Imagick::COLORSPACE_GRAY); $data = $im->getImageChannelMean(\Imagick::CHANNEL_RED); $mean = $data['mean']; $im->...
by chani
2018-11-18T03:19:49-07:00
Forum: Users
Topic: How do you detect duplicates? And how does IM Fingerprint work?
Replies: 2
Views: 1895

How do you detect duplicates? And how does IM Fingerprint work?

Hi there, I tried searching for copy/duplicate/detect duplicate, though I didn't find something here. If I overlooked something (as in this has been already answered somewhere here on the board) please let me know. I also read: https://www.imagemagick.org/Usage/compare/. I am looking for a way to au...
by chani
2018-11-16T14:11:18-07:00
Forum: Digital Image Processing
Topic: 3 Implementations for Adaptive Gamma Correction
Replies: 18
Views: 8190

Re: 3 Implementations for Adaptive Gamma Correction

Hey snibgo, thanks for answering. Now that I worked myself through those (and a few more) papers, I do believe the most difficult and at the same time most important part in automating it is working with classification. i.e. Transforming bright and dark areas differently, Transforming low and high c...
by chani
2018-11-16T13:02:19-07:00
Forum: Digital Image Processing
Topic: 3 Implementations for Adaptive Gamma Correction
Replies: 18
Views: 8190

Re: 3 Implementations for Adaptive Gamma Correction

Hm... Nobody? :D I would have expected some answer. Not sure what exactly... :D
by chani
2018-11-08T15:11:01-07:00
Forum: Digital Image Processing
Topic: 3 Implementations for Adaptive Gamma Correction
Replies: 18
Views: 8190

3 Implementations for Adaptive Gamma Correction

Hi there, I had some very interesting and headache-full days trying to implement the proposed methods of three papers I've found. I decided to use PHP using \Imagick. I believe that those could be easily implemented with pure imagemagick / shell scripts. I'd like to share my results in the hope that...
by chani
2018-10-21T13:54:30-07:00
Forum: Users
Topic: Confused about median
Replies: 6
Views: 2764

Re: Confused about median

Hi Fred,

oh. I see. Thanks.

Jean
by chani
2018-10-21T13:22:34-07:00
Forum: Users
Topic: Confused about median
Replies: 6
Views: 2764

Re: Confused about median

Hi Fred, thanks for answering that fast - You've got really nice scripts on your page, just by the way. Back to topic: I tried with a 9x9 test-picture and a 3x3 grid. The command is: convert scale-test.png -statistic median 3x3 scale1.png This seems to do more but the result is still confusing me. T...
by chani
2018-10-21T12:59:14-07:00
Forum: Users
Topic: Confused about median
Replies: 6
Views: 2764

Confused about median

Hi there, using Linux and ImageMagick 6.9.10-8 Q16 x86_64 20180723 I'm somewhat confused about the results of -statistic median. Please correct me if I'm wrong: Assuming that we do have a 2x2 grayscale grid with two pixel having a value of 134 (gray) and two having a value of 255 (pure white). Calcu...