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