Rendering shaded areas with boundary-localized pseudo-random noi

Details Rendering shaded areas with boundary-localized pseudo-random noi Rendering shaded areas with boundary-localized pseudo-random noi

1989-06-23

1993-01-12

Herndon, Heather R.

395143, G06F 1520

Patent

active

051796414

ABSTRACT:
A computer graphics technique for rendering shaded areas by using pseudo-random noise localized to image boundaries is disclosed. Calculated pixel values are initially generated using an arithmetic accuracy larger than the word size of an associated bitmap memory. The calculated pixel values thus have a most significant portion, corresponding to the portion which is to be stored in bitmap memory, and a least significant portion, corresponding to the additional accuracy. Pseudo-random noise, preferably generated by a linear feedback shift register, is then added to some or all of the least significant portion, and the carry output from this operation is added to the most significant portion. The most significant portion is then written into bitmap memory. Changes in the value of the integer portion thus occur with increased frequency as the distance to an intensity boundary decreases, since the random noise causes the dithering to occur with increased frequency. The result is a more natural display than would otherwise be available with a given bitmap memory word size.

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