Difference between calculating psnr in uint8 and double.
4 次查看(过去 30 天)
显示 更早的评论
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?
0 个评论
回答(2 个)
KSSV
2017-1-27
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);
0 个评论
Walter Roberson
2017-1-27
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.
0 个评论
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!