[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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Field factors such as ghost wave time fluctuations, receiving antenna, variations reception location and others are important when Perceived D/U Ratio (PDUR), a measure of picture quality degradation by ghosts, is introduced to the assessment of ghost interference.
Outdoor measurements were made to investigate the influence of these field factors. It is confirmed that PDUR varies with the level and phase fluctuations of the desired and/or ghost waves ; it varies by the time and by the day. The number of receiving antenna elements and their height statistically contributes little to measured PDUR. PDUR is affected by power lines crossing a reception area, and is also affected by the edge of a building when it is within the first fresnel zone radius.

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Moiré effects caused by optical interference between regularly arrayed solid state image sensor pixels and test chart geometrical patterns were investigated.
Moiré patterns were found to occur as anchor patterns, hyperbolic patterns and circular patterns for a radial line chart, a hyperbolic zone plate chart and a circular zone plate chart, respectively. For a solid state image sensor with N_h horizontal pixels and N_v vertical pixels, the center of Moiré patterns is located along the vertical and horizontal axes at 3N_h/2r or 3r'N_h/2 TV lines for vertically arrayed pixels and at 2N_v/r or 2r'N_h TV lines for horizontally arrayed pixels, where integers r or r' were defined as Moiré's order numbers.
Moire pattern appearances were discussed in connection with the modulation transfer function determined by the effective photo-sensitive apertures of solid state image sensors.

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