Simulation-Based Exploration of SVD-Based Technique for Hidden Communication by Image Steganography Channel - Computer Network Security - page 355

JPG quality %

block size 12x12 block size 16x16 block size 8x8

Fig. 2. Plot of the dependencies between the quality of JPEG compression 1 and BER for dif-
ferent sizes of segmentation blocks

25

20

15

10

5

0

0 0,005 0,01 0,015 0,02 0,025

Rate of embedded bits

block size 12x12 block size 16x16 block size 8x8

Fig. 3. Plot of the dependencies between the rate of the transparently embedded data and BER
for different sizes of segmentation block

Fig. 4 and Fig. 5 demonstrate the relationship between BER and JPEG -like distor-
tions while the distortion of steganography channel is modeled by JPEG compression
1 and the intentional distortion is modeled by JPEG compression 2. Fig. 4 presents
these relationships for the segmentation blocks of size 8 × 8, and Fig. 5 - for the seg-
mentation blocks of size 12 × 12. The solid lines in these figures correspond to the case
without intentional distortion that is consistent with the results shown in Fig. 2 for the
respective sizes of blocks.