HOW TO PERFORM 3 LSB AND 4 LSB REPLACEMENT

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aditya sahu
aditya sahu on 11 Feb 2017
Commented: Geoff Hayes on 12 Feb 2017
SUPPOSE I HAVE AN ARRAY OF 512*512 PIXEL ELEMENTS. I ALSO HAVE ANOTHER ARRAY 'DATA' OF O AND 1 VALUES. I HAVE TO REPLACE THE LAST 3 OR 4 LSB BITS OF EACH PIXEL WITH THE VALUES OF DATA ARRAY VALUES BASED ON SOME CONDITION. LET THE CONDITION IS
IF X==0
THEN I WILL APPLY 3 LSB REPLACEMENT
ELSE IF X==1
4 LSB REPLACEMENT
KINDLY SUGGEST ME ...HOW CAN I PROCEED...THANK YOU

Answers (2)

Geoff Hayes
Geoff Hayes on 11 Feb 2017
aditya - to replace the least significant bits of your pixel, you can use bitset. For example, suppose that X is zero, and we want to replace the last three bits with 101. We would do
X = uint8(0);
X = bitset(X,1,1);
X = bitset(X,2,0);
X = bitset(X,3,1);
and X is now five which what we expect with 00000101.
  2 Comments
Geoff Hayes
Geoff Hayes on 12 Feb 2017
aditya - please note the above is just an example of how to set specific bits and is meant only to indicate how you might do this. It is up to you to incorporate it into your main program...

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