Display gray color only from grayscale image
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Apology for my ignorance as this is quite new to me.
I'm currently working on MRI images and have tried numerous times using some thresholding methods to display gray area of MRI image/s but to no avail.
Any pixel with grayscale value (0-255) of less than 5 & more than 250 will be eliminated and thus only showing pixels within 6-249.
Any helps are much appreciated.
Image Analyst on 17 Jan 2013
You can alter the image to mask out (set to zero) those pixels with gray levels outside 5 and 250 inclusive:
darkPixels = grayImage <= 5;
lightPixels = grayImage >= 250;
pixelsToExclude = darkPixels | lightPixels;
grayImage(pixelsToExclude) = 0;
Is that what you want to do?
More Answers (2)
Amith Kamath on 17 Jan 2013
For most tasks of analysing pixel values and thresholding, I've found http://www.mathworks.com/matlabcentral/fileexchange/6770 very useful.
You could use:
[levelLow bwLow] = thresh_tool(IM);
[levelHi bwHi] = thresh_tool(IM);
%to get the mask for each of the lower and upper level in bw.
depending on the datatype of your image, you can then just do an and operation between your image and the bw images.