MATLAB: How to read 12bit raw data faster

Question

This is my way to read 12bit raw image file.

data = fread(p,[768,1024],'ubit12=>uint32',4,'l');

But it takes very long time, is there any other way to speed up the processing time?

Thanks!

Answer 1

You can read all 16 bits and set the upper 4 bits to zero:

data = fread(p, [768,1024], 'uint16');
b    = uint32(rem(data, 4096));

I assume you can use the format 'uint16=>uint32' directly - please test if this is faster and if rem works on UINT32 arrays.