Galois field to binary matrix conversion (BCH encoding)

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Neeraj Chimwal
Neeraj Chimwal 2021-4-14
编辑： Walter Roberson 2021-4-15
Hii.
I am trying to encode/decode an image using BCH encoder
I did this code
n = 255;
img = imread('pout.tif');
toBinary = img > 102; %convert image to binary
resized = imresize(toBinary, [291 247]); %resize image to get proper encoding ratio
[row k] = size(resized);
msg = gf(resized); %create galios field message
enc = bchenc(msg,n,k);
noisycode = enc + randerr(row,n);
[decmsg,numerr] = bchdec(noisycode,n,k)
isequal(msg,decmsg)
Code might seem dirty as I am new to MATLAB.
The code works fine (I think) but the problem is that final output is a galois field.
I want to convert it to binary matrix i.e my binary Image.
I couldn't find any way to it.

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Walter Roberson
Walter Roberson 2021-4-14
NC = noisycode.x;
That will be uint32 with min 0 and max 0, so you can logical() it or double() it or uint8() it as appropriate for your purpose.
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Walter Roberson
Walter Roberson 2021-4-14
编辑：Walter Roberson 2021-4-15
For gf specifically, it retrieves the values used to create the matrix. It is not documented but is found if you ask for properties(noisycode)
https://www.mathworks.com/help/comm/ref/gf.html

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