Method and apparatus for correcting errors in pixel characterist

Details Method and apparatus for correcting errors in pixel characterist Method and apparatus for correcting errors in pixel characterist

1994-09-01

1997-04-29

Jankus, Almis R.

Image analysis

Histogram processing

For setting a threshold

395126, 395133, 382266, 382267, 382269, G06T 500

Patent

active

056257686

ABSTRACT:
An incremental orthogonal error correction process for 3D graphics for correcting errors or otherwise reducing abrupt changes in the characteristics of adjacent pixels while interpolating a polygon into a pixel grid. Error values are calculated for each desired characteristic to be corrected, where the error values are calculated based on the slope of the main slope and the orthogonal slope of the corresponding characteristic value. Thus, the error values adjust the characteristics of the pixels in the scan line to adjust for the slant of the main slope of the polygon. An interpolator for each corrected characteristic accumulates the error value in the opposite direction as the corresponding orthogonal slope. When the fractional component of the x parameter overflows, the orthogonal slope values are subtracted from the corresponding accumulated error values to thereby reduce the magnitude of the error values. Thus, the error values accumulate until an overflow causes a pixel shift of the scan line, and then the magnitude of the errors is reduced. The resulting values of the characteristics along the surface of the polygon appear smoother and monotonic. Furthermore, intersection lines between polygons drawn in 3D space appear straight rather than jagged.

REFERENCES:
patent: 5420972 (1995-05-01), Johnson, Jr. et al.
Foley, van Dam, Feiner, Hughes, Phillips, Introduction to Computer Graphics, Chapter 3, pp. 65-128 (1990).

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