Digital watermarking system and drift compensating system

Details Digital watermarking system and drift compensating system Digital watermarking system and drift compensating system

2004-11-03

2009-12-01

Ahmed, Samir A. (Department: 2624)

Image analysis

Applications

C375S240180, 36

Reexamination Certificate

active

07627135

ABSTRACT:
An object of the present invention is to perform DCT coefficient operation and drift compensation for embedding watermark data with the small amount of computing. An MB data extraction unit extracts a macro block or block into which the watermark data is embedded on the basis of a template. Additionally, a DCT coefficient extraction unit extracts the DCT coefficient at a position into which the watermark data is embedded according to a direction of the template. A DCT coefficient operation unit performs the process of embedding the watermark data or the process of compensating the drift to the extracted DCT coefficient.

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