Threshold ranges to BW image

2013 7 21
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更新时间：2014 11 21
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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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Image Analyst
Image Analyst 2013-7-21

1 个投票

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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Ahmed
Ahmed 2014-11-20
sir, from the image below, how to create a graph for threshold B&W. Let say i only want to create a graph for the subplot(2,2,4) image. Can u help me sir,
Image Analyst
Image Analyst 2014-11-21
What do you mean by "graph"? Like a line/curve plot? Or a bar chart? Or what?
Ahmed
Ahmed 2014-11-21
like histogram.
Image Analyst
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
Ahmed 2014-11-21
oh, gosh. u r right. i'm not sure also. tq!

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