Posted by
Mike Esterman on
Sep 30, 2015; 9:23pm
URL: http://imagej.273.s1.nabble.com/Compare-Images-to-Quantify-Cleaning-Performance-tp5014503p5014511.html
Frank
You might try subtracting the clean plate image from the dirty plate image
the resulting image will be the dirt - threshold the difference image but
don't apply that will select any particles, or if you want the entire plate
set the threshold to select the entire difference image and could the image
by calculating the mean density of the image.
Hope this helps
Mike
-----Original Message-----
From: ImageJ Interest Group [mailto:
[hidden email]] On Behalf Of Frank
Robson
Sent: Wednesday, September 30, 2015 11:18 AM
To:
[hidden email]
Subject: Compare Images to Quantify Cleaning Performance
Hello,
I'm trying to quantify the cleaning performance of a dishwasher. To do so, I
have standardized "dirt test plates" that I clean using the machine.
I take pictures of the test plates before and after cleaning them and want
to measure how much dirt got off during the process.
I thougth ImageJ could help me out to do so but the only metric I found for
comparision until now are the RGB-values of both images.
I was wondering if there was a better way of doing it.
After the wash, the plate becomes brighter and the stains more grainy.
Pixel to pixel comparision is not possible because the camera is not held
still.
Thank you for your help,
Frank
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