Problem with IMGlib histogram

Igor

The function IMG_histogram_8 uses a variable of type short. They have a value from -32768 to 32768. But in the case of fog or darkness, a certain number of pixels of brightness can exceed these values. What can be done in this case? Which can be way to solve this problem?

over 16 years ago

0 Bernie Thompson TI over 16 years ago

TI__Mastermind 41665 points

The bins in the histogram are actaully using unsigned short which gives 2^16 (-1 for 0) or 65535 pixels for each bin, this does unfortunately mean that if you have an image that has more than 65535 pixels that fall into the same bin that the bin would saturate. To change this behavior you would have to modify the IMG_histogram_8 source code to handle a higher precision per bin, alternatively you could work with a smaller or less consistently valued image.

0 Igor over 16 years ago in reply to Bernie Thompson TI

Intellectual 630 points

Thank you very much!

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Problem with IMGlib histogram