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Encoding Gray scal image

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Neeraj Chimwal
Neeraj Chimwal on 29 Apr 2021
Commented: Jan on 30 Apr 2021
I am trying to encode my gray scale image using encode(img,291,247,'hamming/decimal') but I get this error :
Error using encode (line 78)
For 'hamming' code with decimal data, MSG must be a vector.
If I convert it to a vector using img = img(:), I get this error
Error using *
MTIMES (*) is not fully supported for integer classes. At least one argument must be scalar.
Error in encode (line 117)
code = rem(msg * gen, 2);
Error in dummy (line 5)
encoded = encode(img,127,120,'hamming/decimal');
Can you please help me with this?

Accepted Answer

Jan on 29 Apr 2021
What is the type of the variable img? The documentation of encode() mentions, that the 1st input must by a double. So try:
encode(double(img(:)), 291, 247, 'hamming/decimal')
Neeraj Chimwal
Neeraj Chimwal on 30 Apr 2021
Yes, the error message is not helpful for beginners
Jan on 30 Apr 2021
I do agree with you. It would be useful if you write an enhancement request to TMW to fix this message. You can include a link to this question, to explain the details.

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