Problem with frame difference

[kasperkamperman]

I try to do a simple frame difference. I know I can do it with Processing directly, however I wanted to try it with OpenCV (also because of threshold, flip and more functions).

I found that diff returns a difference even when you compare two the same images. I tried also the diff function that compares two OpenCV Mat objects, that works better.

Any idea if this is a bug, or I make a thinking mistake?

framedifference problem (special script to compare two the same images):
https://gist.github.com/kasperkamperman/b0a412d2a0a99f002856

Mat version that works, however I have some problem with the toCV function and to create a new Mat:
https://gist.github.com/kasperkamperman/0605812c7fb35515ac6c

I hope I post on the right place (was in doubt to post this in the comments of your blog or overhere).

Version info:
OpenCV for Processing 0.5.2 by Greg Borenstein http://gregborenstein.com
Using Java OpenCV 2.4.5.0
Processing 3.0a4

[jorditost]

I experienced the same problem some weeks ago using the diff function (I didn't try it directly with the Mat).

Is there some reason / explanation?

On 19 May 2015, at 22:43, kasperkamperman [email protected] wrote:

I try to do a simple frame difference. I know I can do it with Processing directly, however I wanted to try it with OpenCV (also because of threshold, flip and more functions).

I found that diff returns a difference even when you compare two the same images. I tried also the diff function that compares two OpenCV Mat objects, that works better.

Any idea if this is a bug, or I make a thinking mistake?

framedifference problem (special script to compare two the same images):
https://gist.github.com/kasperkamperman/b0a412d2a0a99f002856

Mat version that works, however I have some problem with the toCV function and to create a new Mat:
https://gist.github.com/kasperkamperman/0605812c7fb35515ac6c

I hope I post on the right place (was in doubt to post this in the comments of your blog or overhere).

Version info:
OpenCV for Processing 0.5.2 by Greg Borenstein http://gregborenstein.com
Using Java OpenCV 2.4.5.0
Processing 3.0a4

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