How to calculate the area of an input image?
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Elias Unk
le 14 Août 2017
Commenté : Image Analyst
le 15 Août 2019
I want to calculate the area of the FULL binary image the user inputs is it as simple as heightXwidth if so what function does it
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Star Strider
le 14 Août 2017
Modifié(e) : Star Strider
le 14 Août 2017
It is equivalent to prod(size(BI)), where ‘BI’ is your binary image.
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Image Analyst
le 14 Août 2017
If you want the number of rows and columns of the binary image, you can do this:
[rows, columns] = size(binaryImage);
If you want the number of pixels (sum total, no matter whether black or white), you can do this:
numPixels = row * columns;
or you can use numel():
numPixels = numel(binaryImage);
If you want the area of just the white/1/true pixels, then you can do
foregroundArea = sum(binaryImage(:)); % Result is in pixels.
backgroundArea = numel(binaryImage) - foregroundArea;
Hopefully one of those examples will give you what you want, because we're not 100% sure what you want.
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Warid Islam
le 15 Août 2019
Hi Image Analyst,
I want to find the area of an RGB image. I was wondering if i need to convert it to grayscale image and then find the area or I can find the area of the RGB image directly? Thank you.
Image Analyst
le 15 Août 2019
No, you can find the area directly. See my attached spatial calibration demo.
Jan
le 14 Août 2017
This sounds like a job for the size() command. But what does "FULL" mean here and how does the user "inputs" the image?
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