Image processing value Extraction

I have a 3D image of size 100*90*100 format int16 with more pixel values and another segmented image of size 100*90*100 in uint8 format with 4 pixels i.e 0- background 1, 2 and 3 foreground.

Now I want to extract the pixels from the 1st image based on the 2nd image pixel's location (example the pixels have to be extracted from the 1st image only where the 2nd image has pixel value 2).

Any help is appreciated.

Answer 1

[Image Analyst]

Try this:

extractedPixels = image1(image2==2);

It will be a 1-D vector of all the voxel values in image #1, where image #2 has a value of 2.

[Jab]

Thank you very much!