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  • Moiré Patterns on Video Pictures Taken by Solid State Image Sensors
  • コタイ サツゾウ ソシ ノ モアレ ガゾウ

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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.<BR>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 Nh horizontal pixels and Nv vertical pixels, the center of Moiré patterns is located along the vertical and horizontal axes at 3Nh/2r or 3r'Nh/2 TV lines for vertically arrayed pixels and at 2Nv/r or 2r'Nh TV lines for horizontally arrayed pixels, where integers r or r' were defined as Moiré's order numbers.<BR>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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