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Journal ArticleDOI

MCPIC: a video coding algorithm for transmission and storage applications

01 Nov 1990-IEEE Communications Magazine (IEEE)-Vol. 28, Iss: 11, pp 24-32
TL;DR: A video coding algorithm developed at Bellcore that has been proposed as a contribution to the standardization activity of ISO/MPEG is described and the following characteristics of the algorithm are described.
Abstract: The Moving Picture Experts Group (MPEG) of ISO is considering a standard for storage applications below 1.5 Mb/s. A video coding algorithm developed at Bellcore that has been proposed as a contribution to the standardization activity of ISO/MPEG is described. The following characteristics of the algorithm are described. The following characteristics of the algorithm are described in detail: frequent periodic reset of the temporal predictor (to provide random access), interpolative coding of every second frame, flexibility of providing adaptive Huffman code tables for digital-storage-media (DSM)-based applications (not feasible for real-time transmissions), 1/2-pel accuracy in motion estimation, and optional quantization matrix. Additional features of reverse playback, fast searches, and random access are described. >
Citations
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Patent
03 Jan 1992
TL;DR: In this paper, a system of distributing video and audio information employs digital signal processing to achieve high rates of data compression, and the compressed and encoded audio and video information is sent over standard telephone, cable or satellite broadcast channels to a receiver specified by a subscriber of the service, preferably in less than real time, for later playback and optional recording on standard audio and/or video tape.
Abstract: A system of distributing video and/or audio information employs digital signal processing to achieve high rates of data compression. The compressed and encoded audio and/or video information is sent over standard telephone, cable or satellite broadcast channels to a receiver specified by a subscriber of the service, preferably in less than real time, for later playback and optional recording on standard audio and/or video tape.

1,032 citations

Patent
13 Aug 1992
TL;DR: In this article, asymmetrical digital subscriber line interface units over a local loop were proposed to provide digital transmission connectivity between the central office and the subscriber for conventional telephone instrument connectivity in a public switched telephone network (PSTN).
Abstract: A public switched telephone network (PSTN) (10) provides digital video signals from a video information provider (140, 160) to one or more of a plurality of subscriber premises (100, 120). A subscriber uses either a standard telephone instrument (102) over the PSTN or a dedicated control device (130, 132) over an ISDN packet network (38) to order video programming. The request is transmitted to a designated video information provider (140, 160) and digital transmission connectivity is established between the video information provider (140, 160) and the central office serving the subscriber. Connectivity between the central office and subscriber is provided by asymmetrical digital subscriber line interface units over a local loop. The interface units frequency multiplex digital video information with voice information to the subscriber and support transmission of a reverse control channel from the subscriber to the central office for transmission on the ISDN packet data network (38) back to the video information provider (140, 160). The interfaces also allow base band signalling and audio between the central office and the subscriber for conventional telephone instrument connectivity.

715 citations

Journal ArticleDOI
TL;DR: Two algorithms for block motion estimation that produce performance similar to that of exhaustive search but with computation reduced by a factor of 8 or 16 are presented.
Abstract: Two algorithms for block motion estimation that produce performance similar to that of exhaustive search but with computation reduced by a factor of 8 or 16 are presented. The algorithms are based on motion-field and pixel subsampling. A subsampled motion field is first determined by estimating the motion vectors for a fraction of the blocks. The motion vectors for these blocks are determined by using only a fraction of the pixels at any searched location and by alternating the pixel subsampling patterns with the searched locations. The subsampled motion field is then interpolated so that a motion vector is determined for each block of pixels. The algorithms are more robust than previously proposed fast algorithms and both can easily be combined with a hierarchical search strategy. One of the algorithms is fully compatible with MPEG-I. >

658 citations

Patent
02 Apr 1993
TL;DR: In this article, a public switched telephone network (PSTN) provides digital video signals from a video information provider or digital service bureau to one or more of a plurality of subscriber premises.
Abstract: A public switched telephone network (PSTN) provides digital video signals from a video information provider or digital service bureau to one or more of a plurality of subscriber premises. Administration of orders from subscribers is carried out by a video gateway and file servers at the central office. Asymmetrical digital subscriber line interface (ADSL) units over a local loop carry the necessary signalling between the subscribers and information providers. The interface units frequency multiplex digital video information with voice information to the subscriber and support transmission of a reverse control channel from the subscriber to the central office for transmission back to the information provider. Several enhancements and special features are disclosed.

570 citations

Patent
29 Mar 1996
TL;DR: In this article, a public switched telephone network for providing information from a multimedia information server to any one of a plurality of subscriber premises, comprises a central office receiving multimedia information signals from an information server and orders from a prescribed subscriber, and a switch for routing multimedia signals from the server to the prescribed subscriber in accordance with the routing data.
Abstract: A public switched telephone network for providing information from a multimedia information server to any one of a plurality of subscriber premises, comprises a central office receiving multimedia information signals from a multimedia information server and orders from a prescribed subscriber. The central office includes a gateway system for conveying routing data in response to subscriber orders and a switch for routing multimedia signals from the server to the prescribed subscriber in accordance with the routing data. An interface at the central office transmits and receives audio telephone service signals, subscriber control signals and digital multimedia information signals on first, second and third signal channels. Each subscriber premises includes an interface for transmitting and receiving audio telephone service signals, subscriber control signals and digital multimedia information signals on the three signal channels. A plurality of subscriber local loops interconnect each subscriber interface and the central office interface. Multimedia information is collected from information providers and stored at media servers that provide a library of data and control sessions. Software modules at the media servers and resident terminals enable interactive multimedia session building, sharing of databases and joint authoring of multimedia presentations.

395 citations

References
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Journal ArticleDOI
01 Apr 1985
TL;DR: An overview of the theory of sampling and reconstruction of multidimensional signals, including the role of the camera and display apertures, and the human visual system is presented and a class of nonlinear interpolation algorithms which adapt to the motion in the scene is presented.
Abstract: Sampling is a fundamental operation in all image communication systems A time-varying image, which is a function of three independent variables, must be sampled in at least two dimensions for transmission over a one-dimensional analog communication channel, and in three dimensions for digital processing and transmission At the receiver, the sampled image must be interpolated to reconstruct a continuous function of space and time In imagery destined for human viewing, the visual system forms an integral part of the reconstruction process This paper presents an overview of the theory of sampling and reconstruction of multidimensional signals The concept of sampling structures based on lattices is introduced The important problem of conversion between different sampling structures is also treated This theory is then applied to the sampling of time-varying imagery, including the role of the camera and display apertures, and the human visual system Finally, a class of nonlinear interpolation algorithms which adapt to the motion in the scene is presented

301 citations