dpietrek's profile - activity

Morphology in opencv works on set of white pixels. So all dual operations are inverted. If you want classic hit or miss, do this:

Mat kernel; // Define your kernel
Mat negkernel;
bitwise_not(element,negkerne);
negkernel = negkernel- 254;

Mat erode;
Mat negerode;

morphologyEx(img, erode, MORPH_DILATE, kernel);
morphologyEx(negerode, negerode, MORPH_DILATE, negkernel);

Mat output;
bitwise_or(erode,negerode,output);

@berak I know that, but this is not intuitive. Why does opencv prefer white as foreground?

It is dilating and eroding white pixels. It should operate on set of black pixels. Bitwise and and or are also inverted.

@LorenaGdL In open cv all morphology operation is inverted. We should use dilate instead of erode, and or operator instead of and (&).

For example dilate in open cv is erode and vice versa.

Hi i wonder why white pixels value is 255? This is not intuitively.