A novel copyright protection scheme for digital content is presented, which is a private watermarking scheme based on the watermark embedding in the DCT domain and watermark extraction Using independent component anal...A novel copyright protection scheme for digital content is presented, which is a private watermarking scheme based on the watermark embedding in the DCT domain and watermark extraction Using independent component analysis （ICA）. The system includes the key for watermark extraction and the host image. The algorithm splits the original image into blocks and classifies these blocks based on visual masking, that is, noise visibility function （NVF）. Watermark components with different strength are inserted into chosen direct current components of DCT coefficients according to the classifier. The watermark extraction is based on the characteristic of the statistic independence of the host image, watermark and key. Principle component analysis （PCA） whitening process and FastICA techniques are introduced to ensure a blind watermark extraction without requiring the original image. Experirnental results show the proposed technique is robust under attacks such as image filtering and adding noise, cropping and resizing. In addition, the proposed private watermarking system can be improved to the application of the DTV content protection system.展开更多
论述了使用数字喷射成形加工技术实现理想材料零件数字化并行设计与制造的原理.分析了表面张力作用下微细管的出流条件,阐明了压电式喷头的工作原理及其性能.开发了以PM AC(programm ab le m u lti-ax is con tro ller)运动控制器为控...论述了使用数字喷射成形加工技术实现理想材料零件数字化并行设计与制造的原理.分析了表面张力作用下微细管的出流条件,阐明了压电式喷头的工作原理及其性能.开发了以PM AC(programm ab le m u lti-ax is con tro ller)运动控制器为控制系统核心,工业控制机为系统支撑单元的并行双CPU控制系统,辅以相应的辅助元件,实现了空间场、材料场、温度场及喷射系统的协调统一.分析了软件系统的组成及各部分的功能.该数字喷射成形加工系统实现了理想材料零件的数字化并行设计与制造.展开更多
基金This project was supported by the Digital TV Special Foundation of National Development and Reform Commission ofChina (040313) Home Coming Scholars Science Activity Foundation of Ministry of Personnel (20041231) the Graduate In-novation Foundation of Xidian University (innovaion 0509)
文摘A novel copyright protection scheme for digital content is presented, which is a private watermarking scheme based on the watermark embedding in the DCT domain and watermark extraction Using independent component analysis （ICA）. The system includes the key for watermark extraction and the host image. The algorithm splits the original image into blocks and classifies these blocks based on visual masking, that is, noise visibility function （NVF）. Watermark components with different strength are inserted into chosen direct current components of DCT coefficients according to the classifier. The watermark extraction is based on the characteristic of the statistic independence of the host image, watermark and key. Principle component analysis （PCA） whitening process and FastICA techniques are introduced to ensure a blind watermark extraction without requiring the original image. Experirnental results show the proposed technique is robust under attacks such as image filtering and adding noise, cropping and resizing. In addition, the proposed private watermarking system can be improved to the application of the DTV content protection system.
文摘论述了使用数字喷射成形加工技术实现理想材料零件数字化并行设计与制造的原理.分析了表面张力作用下微细管的出流条件,阐明了压电式喷头的工作原理及其性能.开发了以PM AC(programm ab le m u lti-ax is con tro ller)运动控制器为控制系统核心,工业控制机为系统支撑单元的并行双CPU控制系统,辅以相应的辅助元件,实现了空间场、材料场、温度场及喷射系统的协调统一.分析了软件系统的组成及各部分的功能.该数字喷射成形加工系统实现了理想材料零件的数字化并行设计与制造.
