How to choose a specific area of an image?
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I would like to ask you how to choose a specific area of an image and then use the elements of this content?
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Yap Sam
on 9 Dec 2017
Hi, I have a question here. Lets say, I have defined an area of polygon using its x and y coordinates. But,how do I able to find out the mean pixels intensity of this area of polygon? Secondly,how should I apply the"if" condition to thershold a certain value of mean intensity of this polygon area.
Kindly advice
Image Analyst
on 9 Dec 2017
Make a mask and then use mean on the masked image:
mask = poly2mask(x, y, rows, columns);
theMeanIntensity = mean(grayImage(mask));
Accepted Answer
Stephen23
on 5 Oct 2015
You need to use some kind of array indexing. Often the easiest is to use logical indexing, which would allow you to select the area that you want.
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