Threshold ranges to BW image

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Syed Islam 2013-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/82702-threshold-ranges-to-bw-image

评论： Ahmed 2014-11-21

Hi,

I have a black and white image, and I am wanting to apply three different thresholds of 105-168, 170-200, and 120-140 to calculate the surface area coverage of three different sections within the image.

Could you please tell me how I could achieve this, in terms of the code or a link where I cold read up on this?

Thanks in advance

Syed

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采纳的回答

Image Analyst 2013-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/82702-threshold-ranges-to-bw-image#answer_92372

在 MATLAB Online 中打开

Try this:

binaryImage1 = grayImage >= 105 & grayImage <= 168;
binaryImage2 = grayImage >= 170 & grayImage <= 200;
binaryImage3 = grayImage >= 120 & grayImage <= 140;
areaFraction1 = sum(binaryImage1(:)) / numel(grayImage);
areaFraction2 = sum(binaryImage2(:)) / numel(grayImage);
areaFraction3 = sum(binaryImage3(:)) / numel(grayImage);

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Image Analyst 2014-11-21

The 224 subplot (lower right) looks like a binary image so the histogram will have only bins for 0 and 1. You can use imhist(). Not sure why you want it though.

Ahmed 2014-11-21