Apparatus and method for mip-map generation using low-pass filte

Details Apparatus and method for mip-map generation using low-pass filte Apparatus and method for mip-map generation using low-pass filte

1994-12-21

1996-10-15

Herndon, Heather R.

G06T 1550

Patent

active

055662846

ABSTRACT:
According to the MIP-map image generating apparatus of the invention, an original texture image stored in a memory is processed by spatial transformation in a discrete cosine transform section, so as to be spatial frequency image data. A polygon calculating section calculates the size of a polygon, and calculates resolution ratios of the texture to be mapped. A spatial low-pass filter allows the components of lower frequencies of the spatial frequency image data to pass therethrough using a cutoff frequency corresponding to the resolution ratios of the texture. After the filtered spatial frequency image data is processed by inverse spatial transformation, the size thereof is reduced. Thus, a MIP-map image having a predetermined size is obtained.

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