A three-dimensional image display apparatus comprising a display panel, which displays a parallel projection image corresponding to a three-dimensional image, and an array plate disposed on a front of the display panel and having pinholes arranged two-dimensionally. The display panel includes pixels arranged two-dimensionally in correspondence with the pinholes. Each of the pixels can include a first subpixel, a second subpixel, and a third subpixel. The apparatus also includes a point at which a line passing through one of the pinholes from the first subpixel intersects the three-dimensional image, a point at which a line passing through the one of the pinholes from the second subpixel intersects the three-dimensional image, and a point at which a line passing through the one of the pinholes from the third subpixel intersects the three-dimensional image being separated from one another.

 
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> Face direction estimation using a single gray-level image

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