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

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Andrew
Andrew 2013-1-8
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.
jpegcomp code: https://www.dropbox.com/s/lpffodrrrwypxjl/jpegcomp.m
didi.m code: https://www.dropbox.com/s/nyj3ygks2d0t2mx/didi.m
thank you very much
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Andrew
Andrew 2013-1-8
this is the comment i get when i run the code..
"(An input argument of type 'double') method 'dct' function, or undefined." Error ==> didi at 12 rowdct = dct(double(o(i,:,k)));
Walter Roberson
Walter Roberson 2013-1-8
So it is complaining that dct is unknown. Do you have the Signal Processing Toolbox installed?

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回答（1 个）

Image Analyst
Image Analyst 2013-1-8
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!
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Andrew
Andrew 2013-1-8
This is what i get when i input your statement into the command window
>> whos o [rows, columns, numberOfColorChannels] = size(o) Name Size Bytes Class Attributes
o 275x183x3 150975 uint8
rows =
275
columns =
183
numberOfColorChannels =
3
Walter Roberson
Walter Roberson 2013-1-8
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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