ITE Transactions on Media Technology and Applications
Online ISSN : 2186-7364
ISSN-L : 2186-7364
Volume 11, Issue 1
Displaying 1-2 of 2 articles from this issue
  • Yoshitaka Kidani, Kyohei Unno, Kei Kawamura, Hiroshi Watanabe
    2023 Volume 11 Issue 1 Pages 1-12
    Published: 2023
    Released on J-STAGE: January 01, 2023

    Overlapped block motion compensation (OBMC) is an inter prediction tool that improves coding performance by blending reference samples of the current and neighboring block across the block boundaries. For this mechanism, OBMC increases the reference samples fetched from the external memory on hardware decoders, i.e., memory bandwidth. This is a disadvantage when introducing OBMC to video coding standards such as VVC, especially for mobile devices with limited batteries, because the extended memory bandwidth increases decoders' power consumption. In this paper, we propose a memory bandwidth constrained OBMC method with adaptive number of motion vectors and interpolation filter taps of the neighboring blocks depending on the current block sizes. Simulation results show that the proposed method achieves -0.22 % performance improvements over VVC reference software without exceeding the maximum memory bandwidth of VVC, which is comparable to the full performance of OBMC (-0.33 %), requiring 3.8 times its memory bandwidth.

    Download PDF (535K)
  • Tomohiko Kimura, Hotaka Ogawa, Tomoyuki Suzuki, Hiroyuki Hamazumi
    2023 Volume 11 Issue 1 Pages 13-25
    Published: 2023
    Released on J-STAGE: January 01, 2023

    Professional wireless cameras using the millimeter-wave band can transmit more information than those in the UHF band, making this band especially useful for transmitting high-quality video and audio with low latency. Although such devices have been put into practical use, there is a need to downsize the equipment on the camera side to reduce expensive millimeter-wave band components and improve operability. In this study, we configure the downlink of a professional wireless camera for UHDTV as a single frequency network (SFN) and study the expansion of coverage provided by a booster. A coupling loop interference canceller and multi-path equalizer are installed in the booster. A computer simulation shows that the booster works well. SFN interference, in which the master and booster waves multiply propagate, can be equalized through frequency domain equalization (FDE) of the single-carrier (SC) system at the receiver side.

    Download PDF (8701K)