Atsuro Ichigaya

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A new method of estimating coding peak signal-tonoise ratio (PSNR) without the use of reference signals is presented. Although PSNR is commonly used as a measure of the picture degradation of digitally coded video, the calculation requires source signals as a reference.Therefore, the usage of PSNR is restricted to particular applications or systems. The(More)
The super hi-vision (SHV) developed by NHK is an ultrahigh-definition video system with 4000 scanning lines. Its video format comprises 7680times4320 pixels, which is 16 times the total number of pixels of HDTV (high definition television) and the frame rate is 60 Hz with progressive scanning. It has been designed to give viewers a strong sense of reality.(More)
We propose a novel video coding scheme targeting Super Hi-Vision (SHV) video sources. While it takes a conventional block-based MC + Transform hybrid coding approach that is suitable for hardware implementation of a SHV video codec, the proposed scheme achieved significant coding efficiency improvement by introducing several coding tools such as intra(More)
A novel video coding standard called high efficiency video coding (HEVC)|ITU-T H.265 was released in 2013. HEVC has twice the compression capability of MPEG-4 AVC|ITU-T H.264, a feature that is expected to enhance new broadcasting services. Japanese broadcasters plan to start a new ultra high definition television service using HEVC. To identify the(More)
The present paper provides transform bases with improved normality and orthogonality properties based on the integer DCT of high-efficiency video coding (HEVC). The proposed transform bases improve the normality and orthogonality properties compared to the HEVC transform bases. Coding and re-encoding experiments were conducted using HEVC test model (HM)(More)
This paper proposes an adaptive scan order of intra prediction on High Efficiency Video Coding (HEVC). In HEVC, prediction, transformation and quantization are applied in a zscan order consistently. The proposed method modifies the z-scan order when intra prediction direction is set to from top-right to bottom-left or from bottom-left to top-right, which is(More)
This paper introduces the world’s first video and audio codec system that complies with 8K broadcasting standards and describes transmission experiments via a broadcasting satellite using this system. 8K Super Hi-Vision (8K) is a broadcasting system capable of highly realistic 8K Ultra High Definition Television (UHDTV) video and 22.2 multichannel audio. In(More)
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