I have a binary image and want to find the area of white in the image

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MJ Thangaraj
MJ Thangaraj 2016 年 3 月 8 日
コメント済み: Image Analyst 2016 年 3 月 8 日
I used rgb2gray(), im2bw and I have a Binary Image all is to find the area of the white portion

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Image Analyst
Image Analyst 2016 年 3 月 8 日
There are 3 ways
area1 = bwarea(binaryImage)
area2 = sum(binaryImage(:))
measurements = regionprops(logical(binaryImage), 'Area');
area3 = sum([measurements.Area])
The first one uses a different algorithm than the other two and will give different results depending on the shape of the boundary. The second two are just pixel counting.
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MJ Thangaraj
MJ Thangaraj 2016 年 3 月 8 日
But the Answer is in Pixels.What should I do to get it in cm2 or some other world units?
Image Analyst
Image Analyst 2016 年 3 月 8 日
See my attached spatial calibration demo. If that answers all your questions, can you mark it as Accepted?

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