Explain the following encoding code

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Nitesh
Nitesh 2014-3-6
回答： Walter Roberson 2014-3-6
Below code is used in encoding where B=pic(:,:,1) is matrix of image.
for v v = 1:1000 % This is the encoder.
for uu = 1:7
if msgmat(vv,uu)==1;
if rem(B(idx(uu+7*(vv-1))),2)==0
B(idx(uu+7*(vv-1))) = B(idx(uu+7*(vv-1)))+1;
end
elseif rem(B(idx(uu+7*(vv-1))),2)==1
B(idx(uu+7*(vv-1))) = B(idx(uu+7*(vv-1)))-1;
end
end
Please tell me whats going on in above code ???? v v and uu are variables

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回答（1 个）

Walter Roberson
Walter Roberson 2014-3-6
The code sets the bottom bit of a location in B to be the same as the value of msgmat() at a location.
idx(uu+7*(vv-1)) would work out the same as idx(uu,vv) provided that idx had 7 rows.

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