Abstract
This paper presents the VLSI architecture and implementation of the highly efficient fractional motion estimation (FME) for High Efficiency Video Coding (HEVC) systems. In this design, the processing sequence of input pixels is highly optimized so that large parts of the hardware resources in the interpolator circuit are shared and the area complexity is greatly reduced. In order to further enhance the efficiency of hardware utilization and to achieve high throughput, the sum of absolute transformed differences circuit is realized using a pipelined time-multiplexing scheme, and the hardware-sharing structure is utilized to reduce the required computation components. Furthermore, comparing to the literature based on HEVC systems, this design enhances the rate-distortion performance by supporting more prediction modes. The proposed design has been synthesized, placed, and routed through cell-based design flow using TSMC 90-nm technology. The post-layout estimations show that, occupying the area complexity of 525.4 kGE, the presented FME architecture achieves 39 frames per second (fps) with resolution of 3840 × 2160 and 29 fps with resolution of 7680 × 4320. In addition, comparing to the prior art that supports 30 fps and the same number of prediction modes, this design achieves a 2 × improvement of hardware efficiency.
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Notes
We note here that QP = 0 ~ 5 may not be needed in most applications nowadays. However, these experimental results can provide more comprehensive insights and shedding some lights on the design and implementation for HEVC systems targeting on potential very high-quality applications.
It has been reported in [28] that utilizing longer tap filters in HEVC compared to shorter filters in H.264/AVC increases the required memory bandwidth by as high as 51% and increases the required multiply-and-add operations by approximately 20%.
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This work is supported in part by the Ministry of Science and Technology, Taiwan, ROC under Grant MOST 104-2221-E-011-122.
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Lung, CY., Shen, CA. Design and implementation of a highly efficient fractional motion estimation for the HEVC encoder. J Real-Time Image Proc 16, 1541–1557 (2019). https://doi.org/10.1007/s11554-016-0663-2
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DOI: https://doi.org/10.1007/s11554-016-0663-2