SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms

A technology of rate-distortion optimization and video coding, which is applied in the field of video coding rate control and can solve problems such as increasing the complexity of the coding end

Inactive Publication Date: 2015-07-22
FUZHOU UNIV
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But if the encoder tries all possible QP values, it wi

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  • SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms
  • SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms
  • SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms

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Embodiment

[0090] Use H.265 to encode an uncompressed original video. In the bit rate control process, first preset the target bit rate. For each coding unit, this algorithm first uses the quadratic R-Q model to calculate the quantization parameter QP; other encoding The parameters are obtained by rate-distortion optimization using SSIM; after the encoding is completed, the video sequence feature parameters α and β are updated and used for rate control of the next coding unit. Compared with the original encoding algorithm of H.265, this algorithm can further reduce the bit rate while maintaining the same image quality, reduce the data storage space and transmission bandwidth while ensuring the video quality, and the obtained bit stream is more stable. Fully compatible with H.265 standard.

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Abstract

The invention discloses SSIM (structural similarity) based HEVC (high efficiency video coding) video coding rate distortion optimizing and rate control algorithms. The SSIM based HEVC video coding rate distortion optimizing algorithm includes: adopting an SSIM based video evaluation method, and calculating video distortion DSSIM to acquire a lagrangian multiplier lambda in a rate distortion optimization model; calculating rate distortion rate in video coding through the lambda. The rate control algorithm adopts a secondary R-Q model in the video coding to represent relation between texture residual bits and edge information code rate in video coding bit streams, coding parameters QP in the rate distortion model and update values of video sequence characteristic parameters of alpha and beta during coding are calculated. With the algorithms, code rate can be further lowered under the condition that image quality is kept constant, and the acquired bit streams are smoother.

Description

technical field [0001] The invention relates to the technical field of video coding rate control, in particular to an SSIM-based HEVC video coding rate-distortion optimization and rate control algorithm. Background technique [0002] In video coding and transmission applications, the new generation of high-performance video coding standard H.265 / MPEG-H HEVC (High Efficiency Video Coding) is a video coding standard established by two international standardization organizations, ISO-IEC / MPEG and ITU-T / VCEG. Developed by the Joint Development Team (JCT-VC), compared with H.264 / AVC, HEVC can reduce the bit rate by half at the same visual quality. [0003] As a new-generation video coding standard, HEVC still belongs to the hybrid coding framework of prediction and transformation. It also includes coding modules such as intra prediction, inter prediction, orthogonal transformation, quantization, filtering, and entropy coding. Careful optimization and improvement have been carrie...

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Application Information

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IPC IPC(8): H04N19/147H04N19/19
Inventor 郑明魁苏凯雄叶宇煌杨秀芝兰诚栋黄博
Owner FUZHOU UNIV
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