I have these two codes. Can someone help me determine whats wrong with them.

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For the "jpegcomp" code, i get an error message telling me to "% load file of variables containing a gray image matrix" even when i load a greyscale lenna image.
for the "didi.m" code, i get an error on ine 12...
I am using matlab R2007b version. Please look at my codes and advise me on what to do.
thank you very much
  3 Comments
Walter Roberson
Walter Roberson on 8 Jan 2013
So it is complaining that dct is unknown. Do you have the Signal Processing Toolbox installed?

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Answers (1)

Image Analyst
Image Analyst on 8 Jan 2013
o is a bad name for a variable - looks too much like a zero. Anyway, put these lines in and tell me what's in the command window:
whos o
[rows, columns, numberOfColorChannels] = size(o) % No semicolon!
  2 Comments
Walter Roberson
Walter Roberson on 8 Jan 2013
That is an RGB image, not a grayscale image as you earlier claimed. It is possible that the R, G, and B planes are all the same; if so then
oR = o(:,:,1);
and work on that instead of on "o".

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