Table 1 Scramble the DCT coefficient
From: Fragile watermarking based on incomplete cryptography for copyright protection
DCT coefficient S l (i,j) | ⌊lo g 2 S l (i,j)⌋ | Scrambled S l′(i,j) |
|---|---|---|
1******* | 7 | 1eeeeeee |
01****** | 6 | 01eeeeee |
001***** | 5 | 001eeeee |
0001**** | 4 | 0001eeee |
00001*** | 3 | 00001eee |
000001** | 2 | 000001ee |
0000001* | 1 | 0000001e |