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[Question #273136]: How does similarity work?

To: sikuli-driver@xxxxxxxxxxxxxxxxxxx
From: Karl <question273136@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 26 Oct 2015 17:32:02 -0000
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New question #273136 on Sikuli:
https://answers.launchpad.net/sikuli/+question/273136

I am updating some images for some tests and noticed that sikuli acts a little differently with some of the images I'm using.

For instances:
1. I had a Modify button (81x31) that was captured, but when retested the Hide button was found.  Similarity needed to be increased.
2. I had a language indicator image (140x11) that could not be found when retested. Similarity needed to be decreased.

I understand the principle of less background and focus on differentiators, plus use regions.  These don't seem to be helping though. 
When I looked at the two images of instance 2, they seemed pixel for pixel the same, but Sikuli saw the difference between the two.

I read the article on the OpenCV matchTemplate, but that's not similarity, is it?


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