Legacy ImageMagick Discussions Archive

Hi everyone im new to Image magic and image processing
i have a test image
http://binarylabsolutions.com/hs/imgs-test/cam2.jpg

and after performing some operation via php imagic interface i converted the image into this

http://binarylabsolutions.com/hs/imgs-t ... 2_cam2.jpg
http://binarylabsolutions.com/hs/imgs-t ... m2.jpg.png

now i just want to count the number of white objects in the image
like in this example the answer will be "8"
-----------------------------------------------------

there was an old threat on this form which has been deleted and buts it was kind of same problem
https://imagemagick.org/discourse-serve ... hp?t=28856

however fortunately i had copy the command

var_dump(
exec("convert out.pbm -define connected-components:verbose=true -define connected-components:area-threshold=50 \ -connected-components 4 -auto-level -depth 8 test.png")
);

but this is not working form me

help please !!

I'll assume the important image is 3_cam2.jpg.png, which is a PNG with transparency.

"connected-components" does the job. We ignore the transparency ("-alpha off"). The image is noisy, so we ignore connected components of less than, say, 50 pixels. We don't save the resulting image (we save it to "NULL:").

Code: Select all

convert 3_cam2.jpg.png -alpha off -define connected-components:verbose=true -define connected-components:area-threshold=50 -connected-components 4 NULL:

The text output is:

Code: Select all

Objects (id: bounding-box centroid area mean-color):
  0: 665x500+0+0 331.7,240.7 294764 gray(0)
  247: 129x103+82+378 150.2,430.1 10520 gray(255)
  246: 142x100+475+350 541.9,400.2 10169 gray(255)
  244: 97x64+132+232 181.7,263.9 4811 gray(255)
  238: 107x60+434+216 484.1,245.9 4797 gray(255)
  186: 76x40+162+145 200.9,164.4 2470 gray(255)
  176: 80x40+400+125 438.6,145.1 2413 gray(255)
  83: 60x28+185+75 215.3,88.4 1367 gray(255)
  55: 63x25+384+63 413.7,75.3 1189 gray(255)

We see that one component is black and the rest are white. A suitable Unix text filter will count the lines with "gray(255)".

You are using convert within PHP or something, so you need to write the text to an array or something.

Please, always provide your IM version and platform when asking questions, since syntax may differ. Also provide your exact command line and if possible your images.

See the top-most post in this forum "IMPORTANT: Please Read This FIRST Before Posting" at http://www.imagemagick.org/discourse-se ... f=1&t=9620

If using Imagemagick 7, then see http://imagemagick.org/script/porting.php#cli

For novices, see

http://www.imagemagick.org/discourse-se ... f=1&t=9620
http://www.imagemagick.org/script/comma ... essing.php
http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/
https://github.com/ImageMagick/usage-markdown

Legacy ImageMagick Discussions Archive

Counting number of object in an PNG image

Counting number of object in an PNG image

Re: Counting number of object in an PNG image

Re: Counting number of object in an PNG image