DCT-based Still Image Compression ICs With Bit-rate Control

2005 ◽  
Author(s):  
M. Nakagawa ◽  
M. Sasaki ◽  
Y. Ishizawa ◽  
Y. Miyano ◽  
M. Yamazaki ◽  
...  
Keyword(s):  
Image Compression ◽  
Rate Control ◽  
Bit Rate ◽  
Still Image

DCT-based still image compression ICs with bit-rate control

1992 ◽  
Vol 38 (3) ◽  
pp. 711-717 ◽  
Author(s):  
M. Nakagawa ◽  
M. Sasaki ◽  
Y. Ishizawa ◽  
Y. Miyano ◽  
M. Yamazaki ◽  
...  
Keyword(s):  
Image Compression ◽  
Rate Control ◽  
Bit Rate ◽  
Still Image

Speed versus quality in low bit-rate still image compression

1999 ◽  
Vol 15 (3) ◽  
pp. 231-254 ◽  
Author(s):  
Amir Averbuch ◽  
Moshe Israeli ◽  
Francois Meyer
Keyword(s):  
Image Compression ◽  
Bit Rate ◽  
Still Image ◽  
Low Bit Rate

scholarly journals Region-of-interest-based rate control scheme for high-efficiency video coding

2014 ◽  
Vol 3 ◽  
Author(s):  
Marwa Meddeb ◽  
Marco Cagnazzo ◽  
Béatrice Pesquet-Popescu
Keyword(s):  
Video Coding ◽  
Rate Control ◽  
Control Algorithm ◽  
High Efficiency ◽  
Region Of Interest ◽  
Bit Allocation ◽  
Bit Rate ◽  
High Efficiency Video Coding ◽  
Control Scheme ◽  
Rate Control Algorithm

This paper presents a novel rate control scheme designed for the newest high efficiency video coding (HEVC) standard, and aimed at enhancing the quality of regions of interest (ROI) for a videoconferencing system. It is designed to consider the different regions at both frame level and coding tree unit (CTU) level. The proposed approach allocates a higher bit rate to the region of interest while keeping the global bit rate close to the assigned target value. The ROIs, typically faces in this application, are automatically detected and each CTU is classified in a region of interest map. This binary map is given as input to the rate control algorithm and the bit allocation is made accordingly. The algorithm is tested, first, using the initial version of the controller introduced in HEVC test model (HM.10), then, extended in HM.13. In this work, we first investigate the impact of differentiated bit allocation between the two regions using a fixed bit rate ratio in intra-coded frames (I-frames) and Bidirectionally predicted frames (B-frames). Then, unit quantization parameters (QPs) are computed independently for CTUs of different regions. The proposed approach has been compared to the reference controller implemented in HM and to a ROI-based rate control algorithm initially proposed for H.264 that we adopted to HEVC and implemented in HM.9. Experimental results show that our scheme has comparable performances with the ROI-based controller proposed for H.264. It achieves accurate target bit rates and provides an improvement in region of interest quality, both in objective metrics (up to 2 dB in PSNR) and based on subjective quality evaluation.

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