3d Patch intensity

I have divided 3D image size of 240x240x240 by k=4. Thus, I have a total of 60x60x60 patches and each patch have a size of 4x4x4. I would like to find the mean intensity of R G B respectively for each patch (4x4x4) and store it as the voxel value. May I know how do I proceed to do it?

For 2d image, i can use R = image(:,:,1), G = image(:,:,2) and B = image(:,:,3). However, i am not sure how do i do this for a 4x4x4 patch. Can i use the same way to do it?

Answer 1

[Priysha LNU]

The 'REGIONPROPS' or 'REGIONPROPS3' command from the Image Processing Toolbox can calculate the minimum, maximum, and average intensity of regions. You can use 'regionprops()'/'regionprops3()'/ function and ask for the mean intensity of all the blobs by setting the 'Pixel Value Measurements' property or the 'Voxel Value Measurements' property respectively.

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, grayscaleImage, 'MeanIntensity');
OR, measurements = regionprops3(labeledImage, grayscaleImage, 'MeanIntensity');

For more information on the REGIONPROPS/REGIONPROPS3 function, type

doc regionprops
doc regionprops3

at the MATLAB Command Window, or go to these documentation links:

• https://www.mathworks.com/help/images/ref/regionprops.html
• https://www.mathworks.com/help/images/ref/regionprops3.html

DISCLAIMER: These are my own views and in no way depict those of MathWorks.