| 摘要 |
Apparatus for restoring compromised image data, including recognizing watermark coding impressed upon video images received by way of a communication channel and subject to alteration prior to and/or during transfer through said channel, includes means for detecting characteristics of said images indicative of at least one feature of said alteration, and means for utilizing said detected characteristics to operate upon the video images received by way of said channel in a sense tending to restore said video images toward their unaltered form prior to their application to said recognition means. Preferably the means for detecting characteristics is responsive to linear boundaries between said video images and their surroundings, and the characteristics are indicative of shrinkage of said video images in both vertical and horizontal directions thereof. |
