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发帖数: 34 | 1 Watermark Extraction
A watermark must be extractable even from degraded documents that might have
been photocopied, scanned, or manipulated by imaging programs. If a degraded
document does not have the same format, resolution, or physical size as the
original, it has to be normalized to the original format before the watermark
can be extracted. Typical normalization processes include format conversion,
resampling, enlarging a cropped part to full size, and scaling of the signal
level.
Watermark |
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