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Improved Prediction Via Thresholding Transform Coefficients

: Schäfer, M.; Pfaff, J.; Rasch, J.; Hinz, T.; Schwarz, H.; Nguyen, T.; Tech, G.; Marpe, D.; Wiegand, T.


Institute of Electrical and Electronics Engineers -IEEE-:
25th IEEE International Conference on Image Processing, ICIP 2018 : October 7-10, 2018, Athens, Greece
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-4799-7061-2
ISBN: 978-1-4799-7062-9
International Conference on Image Processing (ICIP) <25, 2018, Athens>
Conference Paper
Fraunhofer HHI ()

This paper presents a thresholding method for processing the predicted samples in the state-of-the-art High Efficiency Video Coding (HEVC) standard. The method applies an integer-based approximation of the discrete cosine transform to an extended prediction block and sets transform coefficients beneath a certain threshold to zero. Transforming back into the sample domain yields the improved prediction signal. The method is incorporated into a software implementation that is conforming to the HEVC standard and applies to both intra and inter predictions. Consequently, bit-rate savings ranging from 2.3% to 8.0% have been measured in terms of the Bjøntegaard-Delta bit rate (BD-rate).