[Octave-bug-tracker] [bug #43893] image package: Incorrect result of erosion and dilation

[Carnë Draug]

Update of bug #43893 (project octave):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 
                 Release:                   3.8.1 => other                  
                 Summary: Incorrect result of erosion and dilation => image
package: Incorrect result of erosion and dilation

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Follow-up Comment #2:

Your images look fine to me. Note that the white regions of your image (pixels
of value true) are the objects/foreground while the black regions (pixels with
value false) are the background.

The visual effect of erosion is shrinking of objects (white regions become
smaller, very small objects disappear) while the effect of dilation is is the
opposite.  Your screenshoot shows this so the results are as expected.

The only reason I can see someone expecting the opposite is if you are an
ImageJ user. ImageJ uses an inverted LUT for binary images by default ---
background is white, objects are white --- which can be confusing for users of
everything else. If so, you may want to use the complement of your image (use
imcomplement of the image package).

I'm closing this is an invalid (but please comment if we interpreted this
wrong and we will reopen the bug).

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