An ROI-codec-supported rate control algorithm in video compression

Zi-yin Li; Shang-zhong Jin

doi:10.1117/12.755541

29 November 2007 An ROI-codec-supported rate control algorithm in video compression

Zi-yin Li, Shang-zhong Jin

Author Affiliations +

Proceedings Volume 6833, Electronic Imaging and Multimedia Technology V; 683327 (2007) https://doi.org/10.1117/12.755541
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

For low bit rate video compression, the quality of reconstructed video is usually poor. The high codec priority of region of interest (ROI) can improve image quality obviously. Nowadays, video segmentation methods are often used for extracting ROI, but these methods have high computational complexity and are not satisfied to real time communication. On the other hand, in most existing rate control algorithms, ROI can't select the low and high bit rate R-Q model adaptively. Aiming at these problems, in this paper, a simple and efficient approach of extracting ROI is proposed which can decrease the computational complexity of existing ROI extracting algorithms. Bits are distributed to ROI and non- ROI (NROI) respectively according to the image complexity and motion information. Moreover, the judgment criterion of distinguishing between low and high bit rate coding category is derived, which makes the algorithm select the R-Q model adaptively and decrease the rate control errors. In addition, the scheme of modifying the coding order of macro blocks (MBs) can enhance the objective image quality. Experiment results demonstrate that the proposed algorithm achieves a bit rate closer to the target, provides fewer skipped frames, and gets better objective and subjective image quality significantly compared with TMN7 and TMN8 algorithms.

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Zi-yin Li and Shang-zhong Jin "An ROI-codec-supported rate control algorithm in video compression", Proc. SPIE 6833, Electronic Imaging and Multimedia Technology V, 683327 (29 November 2007); https://doi.org/10.1117/12.755541

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