MPEG-1 low-cost encoder solution

Klaus Grueger; Frank Schirrmeister; Lutz Filor; Christian von Reventlow; Ulrich Schneider; Gerriet Mueller; Nicolai Sefzik; Sven Fiedrich

doi:10.1117/12.201216

17 February 1995 MPEG-1 low-cost encoder solution

Klaus Grueger, Frank Schirrmeister, Lutz Filor, Christian von Reventlow, Ulrich Schneider, Gerriet Mueller, Nicolai Sefzik, Sven Fiedrich

Author Affiliations +

Proceedings Volume 2451, Advanced Image and Video Communications and Storage Technologies; (1995) https://doi.org/10.1117/12.201216
Event: Advanced Networks and Services, 1995, Amsterdam, Netherlands

Abstract

A solution for real-time compression of digital YC_RC_B 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.

Citation Download Citation

Klaus Grueger, Frank Schirrmeister, Lutz Filor, Christian von Reventlow, Ulrich Schneider, Gerriet Mueller, Nicolai Sefzik, and Sven Fiedrich "MPEG-1 low-cost encoder solution", Proc. SPIE 2451, Advanced Image and Video Communications and Storage Technologies, (17 February 1995); https://doi.org/10.1117/12.201216

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