Adaptive rate control for Motion JPEG2000

IET Image Process. Pub Date : 2009-03-21 DOI:10.1049/IET-IPR.2008.0053

Ling X. Li, Meng-Xin Guo, Zhensong Wang

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引用次数: 4

Abstract

Rate and quality-constrained rate control is very effective for video applications, since it can maintain constant quality while eliminating local rate spikes. An adaptive rate control method based on image activity measures (ARCIAM) is proposed for Motion JPEG2000. The algorithm can efficiently adjust the compressed bit rates to meet the rate and quality constraints for different types of colour sequences. It predicts the rate-distortion (RD) slope thresholds for frames based on image activity measure (IAM) before entropy coding. Thus, the encoding of unnecessary coding passes can be avoided. Experimental results show that the proposed method can meet the quality and rate constraints, and can achieve quality performance comparable to post-compression rate distortion optimisation at the same bit rate. Under 3 bpp and 40 dB constraints, ARCIAM can reduce the total encoding time and tier-1 encoding time for sequences by more than 20 and 30 , respectively. Moreover, the memory requirement for buffering bit-streams and RD-slope information is reduced by more than 30 on average. Besides, the method can be incorporated into the line-based JPEG2000 encoding system easily, and has been implemented on Kakadu.

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运动JPEG2000的自适应速率控制

速率和质量约束的速率控制对于视频应用非常有效，因为它可以在消除局部速率峰值的同时保持恒定的质量。提出了一种基于图像活动度量的自适应速率控制方法(ARCIAM)。该算法可以有效地调整压缩比特率，以满足不同类型颜色序列的速率和质量约束。它在熵编码前基于图像活动度量(IAM)预测帧的率失真(RD)斜率阈值。因此，可以避免不必要的编码通道的编码。实验结果表明，该方法能够满足质量和速率的约束，在相同比特率下获得与后压缩率失真优化相当的质量性能。在3 bpp和40 dB约束下，ARCIAM可以将序列的总编码时间和第1层编码时间分别减少20和30以上。此外，缓冲比特流和rd斜率信息的内存需求平均减少了30%以上。此外，该方法可以方便地集成到基于线的JPEG2000编码系统中，并已在Kakadu上实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IET Image Process.

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