X-Ray image conversion to greyscale area coverage

Question

Syed Islam 2013-5-20

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Hi Guys,

I have a X-Ray image and am wanting to quantify the different grey regions to get area of coverage. Any ideas how i would go about this?

Thanks

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Answer 1

Image Analyst 2013-5-21

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Try imhist() or mean2(). Also see my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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Walter Roberson 2013-5-21

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Image Analyst 2013-5-21

I referred you to my File Exchange where I have several m-files that you can download to do various things like gray scale image segmentation, and color detection. There is no video, just m-files that you download and run.

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Answer 2

Walter Roberson 2013-5-20

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http://www.mathworks.com/help/images/ref/regionprops.html#bqkf8j2

But it depends how you want to handle different grey levels. Should a pixel be counted as either covered (1) or not covered (0), or should the brightness of the pixel correspond to the density and you want to find the average "weight" of the area ?

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Syed Islam 2013-5-21

Hi Walter,

I'm new to MATLAB. Essentially I have a 512 x 512 X-Ray image, and when I run the command imread('image') I get various grey scale intensities ranging from 0-255.

I want to know quantify the relative amounts either individual values or ranges of say 10 (0-10,11-20...etc) to see the change in grey scale intensity for a stack of X-Ray scans I have by plotting a graph.

Hope I made sense, and I greatly appreciate your help.

Syed

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