How to dilate a straight line width?

I have a binary image having a finite straight line at arbitrary angle...I need to dilate the image in such a way that the line width increases after dilation without changing/dilating its length...how should I do this...any help is highly appreciated

Answer 1

[Image Analyst]

It's just a bit of algebra. You need to find the perpendicular lines at the endpoints. The slope is -1 over the slope of the main line. Then you can use point slope formula like you learned in 10th grade. Do that for each endpoint. I think you can do this because you're a talented engineer. Then use the 4 line segment endpoints and plug into poly2mask(). Then dilate and multiply by the mask to "chop off" the ends.

mask = poly2mask(x,y,rows,columns);
fatLineImage = imdilate(binaryImage, true(30));
finalImage = fatLineImage .* uint8(mask);

[peyush]

thanks I got it right