Experimental setup:

• A watermark is embedded in a 480x272 color image (at approx. 43 dB PSNR) with no preceptual distortion.
• The image is displayed with 2x scale-up factor on a TFT display.
• The screen is photographed with two cameras: a Canon IXUS70 (roughly 7.1 MP) and a Nokia 6300i (2 MP) mobile phone.
• The target images are manually registered (cropped, rotated, scaled) without holding on to accurate affine distortion compensation. No 'trapeze adjustment' has been performed (don't know how to do that with Gimp .
• Presence of the watermark can be easily detected in the registered image while guaranteeing a low probability of false-positive detection (Pfp = 1e-6).

Here are the test images (click on the thumbnails for full-size images):

Canon IXUS70		Nokia 6300i
Captured 3072x2304	Registered 480x272	Captured 1600x1200	Registered 480x272
IMG_3725.JPG	rIMG_3725.png	Image0007.jpg	rImage0007.png
IMG_3727.JPG	rIMG_3727.png	Image0008.jpg	rImage0008.png
IMG_3728.JPG	rIMG_3728.png	Image0009.jpg	rImage0009.png

posted at: 21:26 | path: /academic | permanent link