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Proceedings Paper

MPEG-1 low-cost encoder solution
Author(s): Klaus Grueger; Frank Schirrmeister; Lutz Filor; Christian von Reventlow; Ulrich Schneider; Gerriet Mueller; Nicolai Sefzik; Sven Fiedrich
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Paper Abstract

A solution for real-time compression of digital YCRCB video data to an MPEG-1 video data stream has been developed. As an additional option, motion JPEG and video telephone streams (H.261) can be generated. For MPEG-1, up to two bidirectional predicted images are supported. The required computational power for motion estimation and DCT/IDCT, memory size and memory bandwidth have been the main challenges. The design uses fast-page-mode memory accesses and requires only one single 80 ns EDO-DRAM with 256 X 16 organization for video encoding. This can be achieved only by using adequate access and coding strategies. The architecture consists of an input processing and filter unit, a memory interface, a motion estimation unit, a motion compensation unit, a DCT unit, a quantization control, a VLC unit and a bus interface. For using the available memory bandwidth by the processing tasks, a fixed schedule for memory accesses has been applied, that can be interrupted for asynchronous events. The motion estimation unit implements a highly sophisticated hierarchical search strategy based on block matching. The DCT unit uses a separated fast-DCT flowgraph realized by a switchable hardware unit for both DCT and IDCT operation. By appropriate multiplexing, only one multiplier is required for: DCT, quantization, inverse quantization, and IDCT. The VLC unit generates the video-stream up to the video sequence layer and is directly coupled with an intelligent bus-interface. Thus, the assembly of video, audio and system data can easily be performed by the host computer. Having a relatively low complexity and only small requirements for DRAM circuits, the developed solution can be applied to low-cost encoding products for consumer electronics.

Paper Details

Date Published: 17 February 1995
PDF: 11 pages
Proc. SPIE 2451, Advanced Image and Video Communications and Storage Technologies, (17 February 1995); doi: 10.1117/12.201216
Show Author Affiliations
Klaus Grueger, SICAN GmbH (Germany)
Frank Schirrmeister, SICAN GmbH (Germany)
Lutz Filor, SICAN GmbH (Germany)
Christian von Reventlow, SICAN GmbH (Germany)
Ulrich Schneider, Technische Univ. Berlin (Germany)
Gerriet Mueller, Technische Univ. Berlin (Germany)
Nicolai Sefzik, Technische Univ. Berlin (Germany)
Sven Fiedrich, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 2451:
Advanced Image and Video Communications and Storage Technologies
Naohisa Ohta; Heinz U. Lemke; Jean Claude Lehureau, Editor(s)

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