MATLAB: How to dilate a straight line width

dilationimage processingImage Processing Toolboxmasking

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

Best Answer

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);

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You can use imdilate() on the binaryImage1 to thicken the line before burning it into the image.

MATLAB: How to set the histogram width

It sounds like what you want to do is return the counts and bin centers from hist(). In other words, do not plot with hist(), rather user bar() to plot. The third input argument to bar() is the bar width.

 [N,X] = hist(randn(1000,1));
 bar(X,N,0.5)
 % the input 0.5 controls the bar width, it defaults to 0.8

Best Answer

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