How to Find Bit Error Rate for an Image?

I am working in a project and I do not know how to get the BER between my orignal image and the one received.

so basically If do this

A=imread('m.jpg)
B=imread('m.jpg)
(n,R)=biterr(a,b)

I should get zero ber but this method is not working for me and i am getting an error message. Can somebody help please.

Thanks

[Ashish Uthama]

"biterr" does not appear to be a standard MATLAB function. You will probably get a quick answer if you contact the author of biterr with the full error message and steps to reproduce it.

[ahmed alshammari]

Do you know how I contact the author?

[Walter Roberson]

Actually biterr() *is* a MATLAB function

http://www.mathworks.com/help/toolbox/comm/ref/biterr.html

You need to tell us what the error message is.

Please also tell us class(A), class(B), size(A), size(B)

[ahmed alshammari]

??? Error using ==> de2bi at 159

Specified number of columns must be scalar.

Error in ==> biterr>toBinary at 299

b = de2bi(a(:), num_bits);

Error in ==> biterr at 216

a2 = toBinary(a, num_bits);

Error in ==> untitled2 at 6

[n,R]=biterr(a,b);

I do not have the first three commands in my code I do not know where matlab brought them from. and the pictures are same size because they are the same <540*720*3 unit8>. Please help me if you know any other way to find bit error rate for 2 similar jpg images.

Answer 1

[Tasos Giannoulis]

You are receiving this error because your inputs are 3-dimensional, while BITERR works at most with 2-D data.

More important, BITERR works with the equivalent binary representation. For example,

>> biterr(8, 7)
 ans = 
   4

because 8 = 1000 and 7 = 0111, therefore all 4 bits are different.

Is this what you want? Or do you want to count the number of "pixels" that are different? If your goal is the latter, then you can use this code:

>> sum( sum( A ~= B ) ) / numel(A)

which counts the number of differing numbers and calculates their ratio.

[ARUN SANKARAN]

Can u send me the complete codes ?

Thx you...