Journal ArticleDOI
Bit Rate Reduction Algorithm For A Digital VCR
Sung-Youn Kim,Young-Keun Park,Dae Hee Youn,W.K. Kim,B.K. Yoo +4 more
- Vol. 37, Iss: 3, pp 267-274
TLDR
In this paper, a bit rate reduction algorithm for use in digital VCRs, based on block scrambling and the two-dimensional adaptive discrete cosine transform, is described. But this method is not suitable for video transcoding.Abstract:
The authors describe a bit rate reduction algorithm for use in digital VCRs, based on block scrambling and the two-dimensional adaptive discrete cosine transform. This method satisfies many of the demands unique to digital VCRs. Before the encoding process, the input image is divided into 8*8 pixel blocks and then scrambled on a block-by-block basis to achieve efficient bit distribution in a frame and to simplify buffer control strategy. In addition to block scrambling, a simple yet efficient variable length coding method is proposed. Simulation results are presented. >read more
Citations
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Patent
Critical packet partial encryption
TL;DR: In this paper, the authors proposed an encryption arrangement for multiple encryption of television programs, where only critical packets such as those carrying a payload incorporating packetized elementary stream header information are encrypted.
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Content distribution for multiple digital rights management
TL;DR: In this paper, a method and apparatus for enabling the use of multiple digital rights management scenarios (DRM) is presented, where unencrypted data representing digital content is examined to identify at least segments of content for encryption and then duplicated and encrypted using a first encryption method associated with a first DRM to produce first encrypted segments.
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Content replacement by PID mapping
TL;DR: A method and apparatus for content substitution, consistent with certain embodiments of the present invention involves receiving data representing content, the data having at least first and second packet identifiers (PIDs) associated with the content and placing content having the first PID into a data stream as discussed by the authors.
Patent
Method and apparatus for securing control words
TL;DR: In this paper, a method for securing control words in a descrambler integrated circuit is described. But the method requires the user to decrypt the encrypted control word using a key stored in a register circuit of the descramler integrated circuit and descrambling the scrambled digital content using the decrypted control word.
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Method and apparatus for protecting the transfer of data
TL;DR: In this paper, a method for scrambling and descrambling program data comprises the receipt of a mating key generator message including a manufacturer identifier, which is transmitted to a first remote source identified by the manufacturer identifier.
References
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Journal ArticleDOI
Discrete Cosine Transform
TL;DR: In this article, a discrete cosine transform (DCT) is defined and an algorithm to compute it using the fast Fourier transform is developed, which can be used in the area of digital processing for the purposes of pattern recognition and Wiener filtering.
Journal ArticleDOI
Adaptive Coding of Monochrome and Color Images
Wen-Hsiung Chen,C. Smith +1 more
TL;DR: In this article, an efficient adaptive encoding technique using a new implementation of the Fast Discrete Cosine Transform (FDCT) for bandwidth compression of monochrome and color images is described.
Journal ArticleDOI
Scene Adaptive Coder
Wen-Hsiung Chen,W. Pratt +1 more
TL;DR: An efficient single-pass adaptive bandwidth compression technique using the discrete cosine transform is described, demonstrating excellent results for coding of color images at 0.4 bits/pixel corresponding to real-time color television transmission over a 1.5 Mbit/s channel.
Journal ArticleDOI
The role of human visual models in image processing
TL;DR: Three areas in which human vision models have been successfully applied are image bandwidth compression, image quality assessment, and image enhancement; results from these areas are summarized and some example results are given.
Journal ArticleDOI
An experimental study for a home-use digital VTR
Chojuro Yamamitsu,Akifumi Ide,Akira Iketani,Tatsuro Juri,S. Kadono,Chiyoko Matsumi,K. Matsushita,H. Mizuki +7 more
TL;DR: A modified DCT (discrete cosine transform) has been developed for this system that needs only one-half the number of multipliers of a conventional DCT, making the hardware scale smaller.