Method and apparatus for overcoming a slope overload condition w

Details Method and apparatus for overcoming a slope overload condition w Method and apparatus for overcoming a slope overload condition w

1995-09-29

1998-06-16

Trammell, James P.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345520, H01J 3100

Patent

active

057685070

ABSTRACT:
A display controller to upscale a source video image for display on a display unit of a computer system. An encoder circuit in the display controller circuit stores in a local memory pixel data of previous scan lines required for interpolation in a compressed format using differential pulse code modulation (DPCM) scheme. Encoder circuit avoids a slope overload condition by generating compressed data for a first pixel of each scan line by using the first pixel itself as a reference. Encoder circuit generates compressed data for other pixels by using at least one prior pixel in the corresponding scan line. A decoder circuit decompresses the pixel data into original format prior to sending to an interpolator. The interpolator receives a present scan line and the decompressed data of previous scan lines, and interpolates the received pixels to generate additional pixels required for upscaling the source video image.

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