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Specific image intensity for further processing.

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kwan karmeng
kwan karmeng 2014-7-25
关闭： MATLAB Answer Bot 2021-8-20
How do i select a specific intensity of an image? For example i would like to process only the intensity of 150 on grayscale image.

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Ben11
Ben11 2014-7-25
编辑：Ben11 2014-7-25
Try this:
PixelsofInterest = (YourImage == 150); % get the location of the pixels you want to analyze
imshow(PixelsofInterest)
Image Analyst
Image Analyst 2014-7-25
What does "process" mean? It's trivial to find a "map" - a binary image - that says where the pixels with value 150 are.
binaryImage = grayImage == 150;
But what you do after that depends on what you want to do. If you just want a 1D list of pixel values, you can do
pixelValues = grayImage(binaryImage); % Of course they will all equal 150.
If you want the sum of the pixels (the count), do
totalArea = sum(binaryImage(:));
If you want the perimeter, Solidity, Equivalent circular Diameter, or something like that, you'll have to do
labeledImage = bwlabel(binaryImage);
measurementsStructure = regionprops(labeledImage, grayImage, 'all');
You can pass in specific measurements instead of 'all' if you know what they are.
See the Image Segmentation Tutorial in my File Exchange for a better discussion and demo. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
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kwan karmeng
kwan karmeng 2014-7-26
I want to interpolate the specific intensity, to remove specular reflection actually.
Image Analyst
Image Analyst 2014-7-26
That didn't answer either question. But maybe you want roifill().

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