Watermarking schemes evaluation Abstract鈥擠igital watermarking has been presented as a solution to copy protection of multimedia objects and dozens of schemes and algorithms have been proposed. Two main problems seriously darken the future of this technology though. Firstly, the large number of attacks and weaknesses which appear as fast as new algorithms are proposed, emphasizes the limits of this technology and in particu-lar the fact that it may not match users expectations. Secondly, the requirements, tools and methodologies to assess the current technologies are almost non-existent. The lack of benchmarking of current algorithms is bla-tant. This confuses rights holders as well as software and hardware manufacturers and prevents them from using the solution appropriate to their needs. Indeed basing long-lived protection schemes on badly tested watermarking technology does not make sense.
标签： Watermarking watermarking evaluation presented
上传时间： 2013-12-04
上传用户：thinode
Video-DVM is a very cheap DVM that shows how an output as complex as a videocomposite signal can be generated entirely in software: two I/O pins and three resistors are all the hardware required. Connected to any TV set it displays voltages, included max and min peaks, using both giant digits and an analog bar-display . A serial data output for computer data logging is provided, too.
标签： videocomposite Video-DVM complex output
上传时间： 2014-12-09
上传用户：xuan‘nian
ystem will automatically delete the directory of debug and release, so please do not put files on these two directory.
标签： automatically directory release delete
上传时间： 2014-01-07
上传用户：yyq123456789
Playfair Cipher 1.not even the large number of keys in a monoalphabetic cipher provides security 2.one approach to improving security was to encrypt multiple letters 3.the Playfair Cipher is an example 4.invented by Charles Wheatstone in 1854,but named after his friend Baron Playfair Playfair Key Matrix 1.a 5X5 matrix of letters based on a keyword 2.fill in letters of keyword (sans duplicates) 3.fill rest of matrix with other letters Encrypting and Decrypting -plaintext is encrypted two letters at a time 1. if a pair is a repeated letter, insert filler like X’ 2. if both letters fall in the same row, replace each with letter to right (wrapping back to start from end) 3. if both letters fall in the same column, replace each with the letter below it (again wrapping to top from bottom) 4. otherwise each letter is replaced by the letter in the same row and in the column of the other letter of the pair
标签： monoalphabetic Playfair provides security
上传时间： 2017-05-25
上传用户：变形金刚
Please read your package and describe it at least 40 bytes. System will automatically delete the directory of debug and release, so please do not put files on these two directory.
标签： automatically describe package Please
上传时间： 2013-12-06
上传用户：dave520l
Jpeg Steganography Please read your package and describe it at least 40 bytes. System will automatically delete the directory of debug and release, so please do not put files on these two directory.
标签： Steganography describe package automat
上传时间： 2013-12-17
上传用户：努力努力再努力
This experiment uses the Blackfi n BF533/BF537 EZ-KIT to run a simple FIR fi lter on stereo channels at a sampling frequency of 48 kHz. The CYCLE register is embedded in the main program ( process_data.c) to benchmark the time needed to process two FIR fi lters. A background telemetry channel (BTC) is set up to display the cycle count.
标签： experiment Blackfi EZ-KIT channe
上传时间： 2013-12-27
上传用户：baiom
A bad thing never dies. 遗臭万年。 A bad workman always blames his tools. 不会撑船怪河弯。 A bird in the hand is worth than two in the bush. 一鸟在手胜过双鸟在林。 A boaster and a liar are cousins-german. 吹牛与说谎本是同宗。 A bully is always
上传时间： 2013-12-20
上传用户：iswlkje
Linux下视频捕捉的例子，使用video for linux two API编写，可以提供一个简单的流程，供以后加深。
上传时间： 2014-01-06
上传用户：叶山豪
C Algorithms for Real-Time DSP Chapter 4 covers the basic real-time filtering techniques which are the cornerstone of one-dimensional real-time digital signal processing.
标签： Algorithms techniques Real-Time filtering
上传时间： 2013-12-11
上传用户：lhc9102
