how to read 12bit raw data faster

27 views (last 30 days)
Sounder
Sounder on 6 Feb 2012
Edited: Matt J on 4 Oct 2013
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!
  2 Comments
Sounder
Sounder on 7 Feb 2012
one 12 bits pixel is stored in 2 bytes. It's combined with 4bits of random number and 12 bits of data. So this is the only ezsy way I know to implement, but it takes long time to read.

Sign in to comment.

Accepted Answer

Jan
Jan on 7 Feb 2012
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.
  1 Comment
Sounder
Sounder on 8 Feb 2012
lol it works! 23.5x speedup, thank you

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!