Some Definitions

For an 8-bit gray-scale image X and its restored image Y, with pixel indices 1 i M and 1 j N, i.e., image size is of MN pixels.

         Mean Absolute Error (MAE):

MAE =

1


MN

 

M

i = 1 

 

N

j = 1 

|X(i,j)-Y(i,j)|.

         Peak Signal-to-Noise Ratio (PSNR):

PSNR = 10log10







 

2552


 

1


MN

 



i,j 

(X(i,j)-Y(i,j))2

 







.

Index


File translated from TEX by TTH, version 1.94.
On 31 Mar 2004, 17:45.