Fast Mode Decision for Intra Prediction in H.264/AVC Encoder

La, Byeongdu; Eom, Minyoung; Choe, Yoonsik

doi:10.1109/icip.2007.4379830

Cited by 26 publications

(12 citation statements)

References 3 publications

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“…In other words, these algorithms have similar rate-distortion degradation. Besides, the PSNR values of our proposed algorithm are similar to those of the algorithms in [3] and [4] and are slightly increment in bitrates, compared to the rest of the other algorithms. Therefore, we can say that our proposed algorithm outperforms the other algorithms, especially in terms of time saving.…”

Section: Figsupporting

confidence: 59%

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Fast Intra Prediction Mode Decision for H.264/AVC

Quan

2010

IEICE Trans. Inf. & Syst.

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SUMMARYIn this letter, we present a simple but efficient intra prediction mode decision for H.264/AVC. Based on our investigation, the DC mode appears to be the superior prediction mode among the various candidates. We propose an intra-mode decision algorithm where the DC mode is chosen as a candidate for the best prediction mode. By experimental results, on average, the proposed algorithm significantly saves 81.905% of the entire encoding time compared to the H.264 reference software; besides, it reduces negligible peak signal-to-noise ratio (PSNR) values and slightly increases bitrates.

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Section: Figsupporting

confidence: 59%

“…Pan et al [3] proposed a fast mode decision algorithm for intra-frame coding using local edge information of each macroblock. La et al [4] used the dominant edge direction to make fast mode decision. A simple algorithm based on direction detection of the edge inside the block was developed by Lin et al [5].…”

Section: Introductionmentioning

confidence: 99%

Fast Intra Prediction Mode Decision for H.264/AVC

Quan

2010

IEICE Trans. Inf. & Syst.

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“…The experimental results reveal that the enhanced algorithm outperforms other efficient intra mode decision algorithms such as IST [10] and DED [11]. The algorithm has been applied to MPEG-2 to H.264/AVC intra frame transcoding [12], and the results demonstrate its superiority to other two distinct algorithms in [3] and [4] in all three respects (PSNR, bit rate as well as computation time).…”

Section: Introductionmentioning

confidence: 86%

General Architecture for MPEG-2/H.263/H.264/AVC to H.264/AVC Intra Frame Transcoding

Lin

Hsu

2010

J Sign Process Syst

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The latest international video-coding standard H.264/AVC significantly achieves better coding performance compared to prior video coding standards such as MPEG-2 and H.263, which have been widely used in today's digital video applications. To provide the interoperability between different coding standards, this paper proposes an efficient architecture for MPEG-2/H.263/H.264/AVC to H.264/AVC intra frame transcoding, using the original information such as discrete cosine transform (DCT) coefficients and coded mode type. Low-frequency components of DCT coefficients and a novel rate distortion cost function are used to select a set of candidate modes for rate distortion optimization (RDO) decision. For H.263 and H.264/AVC, a mode refinement scheme is utilized to eliminate unlikely modes before RDO mode decision, based on coded mode information. The experimental results, conducted on JM12.2 with fast C8MB mode decision, reveal that average 58%, 59% and 60% of computation (reencoding) time can be saved for MPEG-2, H.263, H.264/ AVC to H.264/AVC intra frame transcodings respectively, while preserving good coding performance when compared with complex cascaded pixel domain transcoding (CCPDT); or average 88% (a speed up factor of 8) when compared with CCPDT without considering fast C8MB. The proposed algorithm for H.264/AVC homogeneous transcoding is also compared to the simple cascaded pixel domain transcoding (with original mode reuse). The results of this comparison indicate that the proposed algorithm significantly outperforms the mode reuse algorithm in coding performance, with only slightly higher computation.

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“…This indicates that the total encoding time can be considerably reduced if the computations for the RDO intra mode decision can be removed when the best mode for an MB is not one of the intra modes. In the meantime, there have been several researches [14,15,16,17] for fast intra mode decision to solve this well known problem. These researches reduced the total encoding time by alleviating the complexity of the intra mode decision using various algorithms, but inevitably caused a bit rate increment, PSNR loss, or even both.…”

Section: The Low Probability Of Intra Coded Mbmentioning

confidence: 99%

Fast mode decision algorithm based on thread-level parallelization and thread slipstreaming in H.264 video coding

Hyun¹

2010

2010 IEEE International Conference on Multimedia and Expo

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As multicore processors have become a general in computer architecture, parallel algorithms and software designs based on thread-level parallelization are rapidly gaining importance in compute-intensive applications. However, it is difficult to exploit thread-level parallelism for multimedia applications like video encoders due to complicated data/control dependences. In particular, the H.264 encoder has data dependences between the inter mode decision and the intra mode decision, especially when rate-distortion optimization (RDO) is used. This paper proposes a new RDO mode decision algorithm based on thread-level parallelization for the H.264 encoder, which can efficiently resolve the dependences and exploit thread-level parallelism for fast mode decision. The proposed methods, slipstreaming and skipping mechanisms reduce the total encoding time without PSNR loss and bit rate increment. These mechanisms can remove most of computation overhead for RDO intra mode decision as well as improve the computational performance of motion estimation. The experiments performed with JM12.2 showed that the proposed method reduces the total encoding time by 31.3% on average while maintaining the identical PSNR and bit rate.

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Fast Mode Decision for Intra Prediction in H.264/AVC Encoder

Cited by 26 publications

References 3 publications

Fast Intra Prediction Mode Decision for H.264/AVC

Fast Intra Prediction Mode Decision for H.264/AVC

General Architecture for MPEG-2/H.263/H.264/AVC to H.264/AVC Intra Frame Transcoding

Fast mode decision algorithm based on thread-level parallelization and thread slipstreaming in H.264 video coding

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