detreminer how the pixels located in a firm outline and test if a pixel has exceed an outline?

I'm developping a method to amelorate my method of segmentation and i'm facing this problem : detreminer how the pixels located in a firm outline and test if a pixel has exceed an outline?

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/techdoc/ref/inpolygon.html

[Mohamed Amine]

When i affect xv and yv with position of pixels i can't have my outline inpolygon(x,y,xv,yv);

can you explain me with exemple?