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External memory bandwidth is the most critical issue of video coding for high performance or low power concerns. To solve this issue, this paper presents a simple yet efficient lossless embedded compression engine. The engine uses adaptive differential patterns to reduce the data redundancy and encodes the residuals with simple Golomb Rice coding. For data that cannot be compressed, the engine adopts...
In this paper, we propose a real-time platform for the H.264 CODEC with a memory management method, in which we use a preloading mechanism in order to reduce access to external memory. The platform uses an external DDR2 memory (to record the sequence images) and an intelligent memory controller to read the external memory periodically to load another local memory by the macroblocks (of different sizes)...
Region-of-interest (ROI) can be applied in H.264 video encoder to enhance subjective quality and reduce computation complexity. For the aiming application of low cost hardware real-time encoder in videophone with faces as ROI, this paper proposes a face detection algorithm to detect each macroblock (MB) as one part of a face or not. This face detection algorithm has a unique estimation-and-verification...
A H.264/AVC baseline-profile real-time encoder for HDTV-1080p at 30 fps is proposed in this paper. On the basis of the specifications and algorithm optimizations, the dedicated hardware engines and one 32-bit media embedded processor (MeP) equipped with hardware extensions are mapped into the three-stage macroblock pipelining system architecture. This paper describes the design considerations for...
This paper presents a novel method of reference frame compression for use in H.264/AVC video codecs. The method comprises a predictive pattern decision for encoding of original 2times2 pixel blocks, selective step quantization and fast reconstruction of embedded patterns during the decoding. The proposed approach has a number of advantages over existing methods, such as random access to compressed...
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