WATERMARKING Adviser :葉家宏 老師 Presenter :邱怡雯 Date : 2011/03/28.
-
Upload
cecil-crawford -
Category
Documents
-
view
242 -
download
5
Transcript of WATERMARKING Adviser :葉家宏 老師 Presenter :邱怡雯 Date : 2011/03/28.
WATERMARKINGAdviser :葉家宏 老師Presenter :邱怡雯Date : 2011/03/28
Outline
Embed method Gray level logo Binary logo
Result Gray level logo Binary logo
Conclusion
Embed method(1/2) Spatial domain watermarking Gray level logo Embed 4 bits
Add 5%~20% noise
Save the image as JPEG file and choose different quality
Extract directly
Original image
Watermark
Watermarked image
Watermarkextraction
Embed method(2/2) Spatial domain watermarking Binary logo
Add 5%~20% noise
Save the image as JPEG file and choose different quality
Extract directly
Original image
Watermark
Watermarked image
Watermarkextraction
Result-gray level logo(1/7)
(A) bit plane 7 (B) bit plane 6 (C) bit plane 5 (D) bit plane 4
(A) bit plane 7 (B) bit plane 6 (C) bit plane 5 (D) bit plane 4
Embed 4 bit to bit plane 7,6,5 and 4
Result-gray level logo(2/7)
4 4.5 5 5.5 6 6.5 7 7.510
15
20
25
30
35
40
45
Embed1bit
Embed2bit
Embed4bit
Bit plane
PS
NR
PSNR curve with embed the watermarking in different bit plane
Result-gray level logo(3/7)
Add noise(use PS) to bit plane 5 which embed 4 bits
(A)5% (B)10% (C)15% (D)20%
(A)5% (B)10% (C)15% (D)20%
Result-gray level logo(4/7)
Add noise to bit plane 5 which embed 4 bits
(A)5% (B)10% (C)15% (D)20%
(A)5% (B)10% (C)15% (D)20%
Result-gray level logo(5/7)
Compress .raw into different quality
(A)10% (B)30% (C)50% (D)70%
Bit plane 5 which embed 4 bits
Result-binary logo(6/7)
(A) bit plane 7 (B) bit plane 6 (C) bit plane 5 (D) bit plane 4
Embed binary logo to bit plane 7,6,5 and 4
Add noise to bit plane 5 and 4
Result-binary logo(7/7)
(A)5% (B)10% (C)15% (D)20%
Plane 5
Plane 4
Conclusion
Embed bits to high bit plane are more robust but lower PSNR
THE END