How to calculate the compression ratio for compressed image?

hi,

I am working on image processing project, I need to find the compression ratio of compressed image.

Answer 1

[Image Analyst]

After you've saved your image onto disk in your compressed format, look at the file size and compare it to the other file which is compressed with a different method or uncompressed:

fileName = 'moon.tif';
fileInfo = imfinfo(fileName)
strInfo = sprintf('\n%s is an %d bit image.\nFile size = %d bytes, and %d columns wide by %d lines tall', ...
  fileName, fileInfo.BitsPerSample, fileInfo.FileSize, fileInfo.Width, fileInfo.Height);
fprintf('%s\n', strInfo);