By Bernard Chazelle (auth.), Frank Dehne, Andrew Rau-Chaplin, Jörg-Rüdiger Sack, Roberto Tamassia (eds.)
This publication constitutes the refereed complaints of the fifth foreign Workshop on Algorithms and information constructions, WADS'97, held in Nova Scotia, Halifax, Canada, in August 1997.
The 37 revised complete papers provided have been conscientiously chosen from a complete of eighty one submissions. additionally incorporated are 4 abstracts and one complete contribution akin to the invited talks. one of the issues lined are info constructions and algorithmic features in numerous components like computational geometry, graph concept, networking, load balancing, optimization, approximation, sorting, trend matching, etc.
Read or Download Algorithms and Data Structures: 5th International Workshop, WADS'97 Halifax, Nova Scotia, Canada August 6–8, 1997 Proceedings PDF
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Extra resources for Algorithms and Data Structures: 5th International Workshop, WADS'97 Halifax, Nova Scotia, Canada August 6–8, 1997 Proceedings
Since the cover media is known to the encoder, one can optimize the coding process in order to adapt the watermark to the channel characteristics. The procedure consists in looking for the shift of the to-be-embedded watermark pattern which leads to the best correlation value with the cover image. The num☞ ✒ ✕ . 13 using different key combinations. 13: Detection and BER improvement using informed embedding. One must keep in mind that exhaustive search for synchronization tends to increase the probability of high detection value on a content which is not watermarked.
All possible subsets have to be considered, starting with the subsets containing the largest number of points. ✝ For a given subset of points, the determination of the grid’s base vectors ✢ and ✝✢ ❀ ✄ can be performed by an iterative algorithm. Two points belonging to 54 Chapter 3. 2-D periodic patterns for image watermarking the set are chosen as starting base vectors. At each step, the biggest base vector is replaced by a smaller vector derived from a point not yet part of the intermediate grid.
Image expected size means minimum size of image from which the message should be recovered. 3 A spatial watermarking scheme based on generalized 2-D periodic patterns Message M ... Convolutional coding Code C ... A Random repetition (expansion) ✝✆ Sequence S ~ A A Pattern construction ~ A A ... ✂✁ ☎ ✄ , Pattern W ( ✞✠✟☛✡☞✞✍✌✎✡☞✏ ; ✑✓✒✔✡✖✕✘✗ ; ✙✛✚✜✡☞✢ ; ✙✤✣✥✡✦✕✧✏ ) ~ ~ A A ~ ~ A A A A A A ... ~ ~ A A ~ ~ A A ... A A A A ... ... ... ... 7: Watermark pattern construction parameters should be optimized for each situation.