Abstract: A perspective projection calculation device making a perspective correction accurately and rapidly in each plane while avoiding an increase in the number of dividing operations. The perspective projection calculation device comprises at least one plane slope element coefficient calculation unit for calculating a coefficient which implies a plane slope element of the triangle defined in the three-dimensional space usable in common in a plurality of geometrical parameters to be interpolated, at least on interpolation coefficient calculation unit for calculating an interpolation coefficient from the plane slope element coefficient calculated by the plane slope element coefficient calculation unit, and at least one correction unit for making a perspective correction, using the interpolation coefficient obtained in the interpolation coefficient calculation unit.

Abstract: An image processing system for perspectively projecting a triangle defined in a three-dimensional space onto a two-dimensional space and shading the triangle in the two-dimensional space, includes a memory which stores at least inverses of depth coordinates; a CPU which calculates a plane slope element coefficient which implies a plane slope element of the triangle defined in the three-dimensional space, and calculates an interpolation coefficient from the plane slope element coefficient; and a graphics processor which makes a perspective correction using the interpolation coefficient and inverses of depth coordinates stored in the memory. The graphics processor may output inverses of depth coordinates for storage in the memory in advance, and may output a result of the perspective correction for storage in the memory. The image processing system may also include a display for displaying a result of the perspective correction.

Abstract: A perspective projection calculation device making a perspective correction accurately and rapidly in each plane while avoiding an increase in the number of dividing operations. The perspective projection calculation device comprises at least one plane slope element coefficient calculation unit for calculating a coefficient which implies a plane slope element of the triangle defined in the three-dimensional space usable in common in a plurality of geometrical parameters to be interpolated, at least on interpolation coefficient calculation unit for calculating an interpolation coefficient from the plane slope element coefficient calculated by the plane slope element coefficient calculation unit, and at least one correction unit for making a perspective correction, using the interpolation coefficient obtained in the interpolation coefficient calculation unit.