Nec Corporation

Dhs, Ltd.

Yoichi Katayama

Makoto Iwahara

Takeyoshi Dohi

Hidenobu Harasaki

Nobuhiko Hata

Hongen Liao

The present invention provides a three-dimensional image display device capable of reproducing clear, deviation-free and distortion-free three-dimensional images generated by a three-dimensional generating method. The three-dimensional image display devicecomprises a lens arrayhaving the predetermined number of convex lenses arranged in a matrix; and image display means for displaying a plurality of two-dimensional imagescorresponding to the respective convex lenses. The same lens arrayis employed in the three-dimensional display device as the lens array employed for generating the two-dimensional images.

Three-dimensional image calculating method, three-dimensional image generating method and three-dimensional image display device

Method for compressing and decompressing image signals and apparatus for compressing and decompressing image signals

When adding a first data and a second data, a selection circuit outputs the first data and a constant number 1 to a multiplication circuit and the second data to an addition circuit. When subtracting the second data from the first data, the selection circuit outputs the first data and a constant number -1 to the multiplication circuit and the second data to the addition circuit. When multiplying the first data by the second data, the selection circuit outputs the first data and the second data to the multiplication circuit and a constant number zero to the addition circuit. The multiplication circuit multiplies two input values and outputs a result to the addition circuit. The addition circuit adds the two input values.

Orthogonal transformation processing device

A three-dimensional image processing apparatus and method wherein a three-dimensional digital image in a three-dimensional memory is cut and read out to perform image processing. Addresses of a two-dimensional digital differential analyzer are first calculated by ray tracing in a direction of a vector on one plane of a three plane coordinate system of a three-dimensional coordinate system, and then data of voxel columns, arranged perpendicularly to the one plane coordinate system in the three-dimensional space along straight lines perpendicular to the ray at the addresses, are read out in units of a column for the individual voxel columns from the three-dimensional memory. A pair of three-dimensional memories are utilized, and a writing operation of a three-dimensional digital image into one of the three-dimensional memories and a reading out operation of the voxel columns from the other three-dimensional memory are performed simultaneously in a parallel relationship.

Method of and apparatus for reading out digital image data from

An image memory device wherein data necessary for interpolation is read out simply and successively from a frame memory at a time without requiring a complicated timing control circuit to allow interpolation processing to be performed at a high speed. Image data are temporarily stored into a plurality of parallel frame memories having an interleave construction. Conversion addresses for the frame memories are generated based on different conversion rules from a plurality of address decoders and applied in parallel at a time to the frame memories so that data at neighboring points of a coordinate position for an object of interpolation are outputted at a time from the frame memories. The neighboring point data are inputted in parallel at a time, or pipeline inputted, to an interpolation calculation circuit so that coefficients are generated from individual pipelines. Product sum calculation is performed for the coefficients and the neighboring point data.

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Tokyo, Japan

Yoichi Katayama