AVX2-optimized Kvazaar HEVC intra encoder
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Details
| Original language | English |
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| Title of host publication | 2016 IEEE International Conference on Image Processing (ICIP) |
| Publisher | IEEE |
| Pages | 549-553 |
| ISBN (Electronic) | 978-1-4673-9961-6 |
| DOIs | |
| Publication status | Published - 2016 |
| Publication type | A4 Article in a conference publication |
| Event | IEEE International Conference on Image Processing - Duration: 1 Jan 1900 → … |
Publication series
| Name | |
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| ISSN (Electronic) | 2381-8549 |
Conference
| Conference | IEEE International Conference on Image Processing |
|---|---|
| Period | 1/01/00 → … |
Abstract
This paper presents efficient SIMD optimizations for the open-source Kvazaar HEVC intra encoder. The C implementation of Kvazaar is accelerated by Intel AVX2 instructions whose effect on Kvazaar ultrafast preset is profiled. According to our profiling results, C functions of SATD, DCT, quantization, and intra prediction account for over 60% of the total intra coding time of Kvazaar ultrafast preset. This work shows that optimizing primarily these functions doubles the coding speed of a single-threaded Kvazaar intra encoder for the same rate-distortion performance. The highest performance boost is obtained by deploying the proposed optimizations jointly with multithreading. On the Intel 8-core i7 processor, the AVX2-optimized 16-threaded Kvazaar ultrafast preset achieves real-time (30 fps) intra coding speed up to 1080p resolution. Compared to AVX2-optimized ultrafast preset of x265, Kvazaar is 20% times faster and still obtains 9.1% bit rate gain for the same quality. These results justify that Kvazaar is currently the leading open-source HEVC intra encoder in terms of real-time coding speed and efficiency.
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Field of science, Statistics Finland
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