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Enhancement Suggestion
Posted: 2017-05-16T16:10:51-07:00
by fmw42
If this is not a large effort, then perhaps compare might be enhanced to permit other operations within parenthesis processing, such as:
-resize
-rotate
-trim
-crop
-distort SRT
-brightness-contrast
-level
-sigmoidal-contrast
This would allow modification of the reference image in-line (without having to process externally and save to file) the image so that one may be able to loop over compare more efficiently to test different rotations and/or sizes (and possibly adjust the brightness/contrast).
Alternately, perhaps enhance
convert .... -compare -format "%[distortion] info:
to allow subimage-search and to report the coordinates of the best match.
Re: Enhancement Suggestion
Posted: 2017-05-16T16:36:38-07:00
by snibgo
This would be useful. My preference would be to allow "-subimage-search", "‑dissimilarity‑threshold" and "‑similarity‑threshold" within both "convert" and "magick", with reporting of the found coordinates.
Re: Enhancement Suggestion
Posted: 2017-05-16T16:43:04-07:00
by fmw42
Re: Enhancement Suggestion
Posted: 2017-05-16T17:55:57-07:00
by magick
We'll add the operators you suggested to the 'compare' command-line utility in the next point release of ImageMagick.
Re: Enhancement Suggestion
Posted: 2017-05-17T11:13:28-07:00
by fmw42
Thanks. Would you add the following also, so that the background can be set during rotation and the texture under transparency can be set to a constant color and a mask extracted from the transparent reference
-background
-virtual-pixel
-alpha (background, extract, off)
Re: Enhancement Suggestion
Posted: 2017-05-17T12:18:09-07:00
by magick
We added support for -background. The other two options are already supported.
Re: Enhancement Suggestion
Posted: 2017-05-17T13:11:32-07:00
by fmw42
Thanks
Re: Enhancement Suggestion
Posted: 2017-05-18T20:30:23-07:00
by fmw42
I tried this command in the latest beta:
Code: Select all
im6beta compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( 224977object4.png +repage -background black -alpha background -rotate 180 -trim +repage \) \
diff.png
but it errors with regard to +repage. Would you add repage, please.
(Images from
viewtopic.php?f=1&t=31928&start=15#p146149)
Re: Enhancement Suggestion
Posted: 2017-05-19T04:30:56-07:00
by magick
Done.
Re: Enhancement Suggestion
Posted: 2017-05-19T14:07:34-07:00
by fmw42
Thanks. This command works now in the latest IM 6.9.8.6 beta as of today.
Code: Select all
compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( 224977object4.png +repage -background black -alpha background -rotate 180 -trim +repage \) \
diff.png
4808.31 (0.0733701) @ 269,40
Re: Enhancement Suggestion
Posted: 2017-05-19T14:33:46-07:00
by fmw42
Sorry, one more request. Would you add +-write and +-delete so that I can save to mpr: format, such as in the following for IM 7 with masking:
magick compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( 224977object4.png +repage -background black -alpha background -write mpr:ref +delete \
mpr:ref -alpha extract -write mpr:mask +delete \) \
\( -read-mask mpr:mask mpr:ref \) diff.png
compare: unrecognized option `-write' @ error/compare.c/CompareImagesCommand/1079.
Or if this extra parens to create the mpr: images in the above is not possible, then would you allow parenthesis processing for the mask image and reference image separately, so that I can do
im7beta magick compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( -read-mask \
\( 224977object4.png +repage -background black -alpha background -alpha extract \) \
\( 224977object4.png +repage -background black -alpha background \) \
\) diff.png
compare: unable to open image '(': No such file or directory @ error/blob.c/OpenBlob/3094.
compare: no decode delegate for this image format `' @ error/constitute.c/ReadImage/509.
Re: Enhancement Suggestion
Posted: 2017-05-19T17:05:24-07:00
by magick
Done.
Re: Enhancement Suggestion
Posted: 2017-05-20T17:02:34-07:00
by fmw42
The commands below do not seem to work to rotate the small image 180 deg and compare to the larger image in the latest IM release 7.0.5.7.
Inputs:
This command errors:
Code: Select all
magick compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( -read-mask \
\( 224977object4.png +repage -background black -alpha background -alpha extract \) \
\( 224977object4.png +repage -background black -alpha background \) \
\) diff7.png
compare: no decode delegate for this image format `' @ error/constitute.c/ReadImage/509.
This command finishes but is not the proper match:
Code: Select all
magick compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 370669patch.png +repage -background black -alpha background \) \
\( -read-mask 224977object4.png +repage -background black -alpha background -alpha extract \) \
\( 224977object4.png +repage -background black -alpha background \) diff7.png
It should produce something similar to the IM 6.9.8.6 command that does not use a mask and achieves a perfect match as follows:
Code: Select all
convert \
\( 370669patch.png +repage -background black -alpha background \) \
\( 224977object4.png +repage -background black -alpha background \) miff:- |\
compare -metric rmse -subimage-search -dissimilarity-threshold 1 - diff6.png
0 (0) @ 353,6
Was the last set of changes folded into this release or the upcoming Beta? Or am I not doing something correctly?
Re: Enhancement Suggestion
Posted: 2017-05-20T17:17:44-07:00
by fmw42
Sorry, the following does work properly in IM 7.0.5.7 with the following command approach and shows a perfect match at the proper location
Code: Select all
magick compare -metric rmse -subimage-search -dissimilarity-threshold 1 \
\( 224977object4.png +repage -background black -alpha background -write mpr:ref +delete \
mpr:ref -alpha extract -write mpr:mask +delete \) \
\( 370669patch.png +repage -background black -alpha background \) \
\( -read-mask mpr:mask mpr:ref \) -alpha off diff.png
0 (0) @ 353,6
Thanks. So I can use parenthesis processing with mpr: