Contribution to research and development on the picture quality improvement of HDTV and EDTV (Enhanced TV) and to the international standardization of HDTV

Number of scanning line and viewing distance in terms of the perception of the impairment due to the scanning line structure

Fig.1 Number of scanning line and viewing distance in terms of the perception of the impairment due to the scanning line structure

Schematic diagram of an interpolation filter for scanning conversion from 2:1 interlace to progressive scanning

Fig.2 Schematic diagram of an interpolation filter for scanning conversion from 2:1 interlace to progressive scanning

Concept of linear interpolation frame rate conversion (Conversion from 60 frames/sec to 50 frames/sec)

Fig.3 Concept of linear interpolation frame rate conversion (Conversion from 60 frames/sec to 50 frames/sec)

Concept of motion compensated frame rate conversion (Conversion from 60 frames/sec to 50 frames/sec)

Fig.4 Concept of motion compensated frame rate conversion (Conversion from 60 frames/sec to 50 frames/sec)

  Taiji Nishizawa engaged in research and development on the scanning system of television in the early stage of the development of HDTV. He made clear the difference between progressive and interlace scanning in terms of picture quality impairment. He analyzed interlace and progressive scanning based on the spatio-temporal sampling theory. He developed a scanning conversion system from 2:1 interlace scanning to progressive scanning to improve the picture quality of 2:1 interlace scanning signals. He also engaged in the picture quality improvement of a standard converter. He developed the world first standard converter from HDTV to PAL using motion compensation technique. Thus he had a leading role in the field of improving picture quality of television.

  He served as Vice Chairman of Study Group 11 and Chairman of WP11B of ITU-R and contributed to establish the ITU-R Recommendations such as the studio standard of HDTV.

  The Institute of Image Information and Television Engineers presented Niwa-Takayanagi Achievement Award to Taiji Nishizawa of NHK in 1991 recognizing his work mentioned above.



Publications

[1] Taiji Nishizawa、Visual Effect of Interlace Scanning、1971、ITEJ Visual Information Research Report, vol.25, no.3
[2] Taiji Nishizawa and Yutaka Tanaka、Picture Quality Improvement by Scanning Conversion from Interlace to Non-interlace、1984、NHK Technical Report, vol.27, no.12
[3] Y. Tanaka, T. Ohmura, K. Okada, Y. Ohtsuka, T. Kurita, S. Goshi, Y. Ninomiya, and T. Nishizawa、HDTV-PAL Standard Converter Using Motion Compensation Technique, and Converted Picture Quality、1987、IEICE Transaction D, vol.J70-D, no.8.

Related Researches

Category

Broadcasting
(Human Information Research)
Broadcasting
(Broadcast Systems)

Events in World

1991
Gulf War started.
1991
Soviet Union dissolved.
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