Difference between calculating psnr in uint8 and double.

2017 1 27
2 个回答
更新时间：2017 1 27
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0 个投票

I have implemented a data hiding algorithm(multilevel histogram modification and sequential recovery).I am getting psnr about 30 if calculated with respect to images in double and 10 psnr if calculated with uint8. Should I proceed with psnr in double or not?

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回答（2 个）

KSSV
KSSV 2017-1-27

0 个投票

uint8 is used unsigned 8 bit integer. It is easy to convert double to uint8 or otherway.
let say I have matrix of uin8 A.
then to convert it to double use:
A = double(A);
and to convert it back to uint8 use:
A = uint8(A);
Walter Roberson
Walter Roberson 2017-1-27

0 个投票

Psnr involves subtraction. But if you subtract a larger uint8 from a smaller you get 0 rather than a negative number. That makes it look like the locations were the same when they are not.

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