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COG for large images
Clint Chapman from Canada  [20 posts]
8 years
The COG module doesn't seem to work for the attached, very large image and the Geometric Statistics module gives negative values for the COG.  I'm guessing it's an overflow problem?  It would be great if it was possible to use the Circle module on this image as well (after using Canny edge detection of course).

Any thoughts?

Thanks,
Clint
Clint Chapman from Canada  [20 posts] 8 years
Trying to post the image again
Clint Chapman from Canada  [20 posts] 8 years
Trying to upload a gif instead of jpg

jpg image is: 2720x2048 but only 156KB
gif image is: 2720x2048 but only 19kb
Anonymous 8 years
Clint,

The COG module has been updated to work correctly with this image (quite a big one!). Note that you can also use the scale routine to decrease the size of the image before processing as with the subpixel capabilities of the COG perhaps the precision would be enough even with a smaller image?

Regardless, 2.0.8.8 has the update.

STeven.
Clint Chapman from Canada  [20 posts] 8 years
STeven,
Thanks for the update.  As I stated in another message, we're trying to resolve circle centers with very high precision and that's why we're using such high resolution images.  Thanks for the suggestion though.

Clint

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