Encoding Gray scal image

Hi.

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?

Answer 1

[Jan]

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]

I have been trying this for 2 days, but never thought of converting to double.

Now I feel dumb.

Anyway thankyou

[Jan]

The error message is not optimal. Better:

For 'hamming' code with decimal data, MSG must be a <double> vector.

[Neeraj Chimwal]

Yes, the error message is not helpful for beginners

[Jan]

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.