Space-Time Quantization and Motion-Aligned Reconstruction for Block-Based Compressive Video Sensing

作者：Li, Ran^*; Liu, Hongbing; He, Wei; Ma, Xingpo

来源：KSII Transactions on Internet and Information Systems, 2016, 10(1): 321-340.

DOI：10.3837/tiis.2016.01.019

• Compressive video sensing
• space-time quantization
• motion-aligned reconstruction
• median filter based prediction
• multi-hypothesis prediction

The Compressive Video Sensing (CVS) is a useful technology for wireless systems requiring simple encoders but handling more complex decoders, and its rate-distortion performance is highly affected by the quantization of measurements and reconstruction of video frame, which motivates us to presents the Space-Time Quantization (ST-Q) and Motion-Aligned Reconstruction (MA-R) in this paper to both improve the performance of CVS system. The ST-Q removes the space-time redundancy in the measurement vector to reduce the amount of bits required to encode the video frame, and it also guarantees a low quantization error due to the fact that the high frequency of small values close to zero in the predictive residuals limits the intensity of quantizing noise. The MA-R constructs the Multi-Hypothesis (MH) matrix by selecting the temporal neighbors along the motion trajectory of current to-be-reconstructed block to improve the accuracy of prediction, and besides it reduces the computational complexity of motion estimation by the extraction of static area and 3-D Recursive Search (3DRS). Extensive experiments validate that the significant improvements is achieved by ST-Q in the rate-distortion as compared with the existing quantization methods, and the MA-R improves both the objective and the subjective quality of the reconstructed video frame. Combined with ST-Q and MA-R, the CVS system obtains a significant rate-distortion performance gain when compared with the existing CS-based video codecs.

• 出版日期2016-1-31
• 单位信阳师范学院