Dropout control in subpixel rendering

Details Dropout control in subpixel rendering Dropout control in subpixel rendering

2005-05-17

2005-05-17

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S421000, C345S428000, C345S611000, C382S254000, C382S266000, C382S269000

Reexamination Certificate

active

06894702

ABSTRACT:
The present invention relates to dropout control in which one or more samples are added to adjacent samples that fall within an image outline. The samples are used in sub-pixel rendering to compensate for unnaturally thin or faint object stems. Horizontal dropout control operations are provided to add samples to sets of horizontally adjacent samples such that each set of samples comprises a minimum number of samples. Vertical dropout control operations are provided to position samples such that the weighted anti-aliasing filtering will take sufficient account of the samples. In one embodiment, an associative table is utilized to calculate alternative patterns of samples. In another embodiment, the baseline of an object is used in the dropout control operations to reduce artifacts that can be created by the addition of samples in the vertical direction.

REFERENCES:
patent: 4470065 (1984-09-01), Reitmeier
patent: 6188776 (2001-02-01), Covell et al.
patent: 6219025 (2001-04-01), Hill et al.
patent: 6508768 (2003-01-01), Hall et al.
patent: 20020015041 (2002-02-01), Naegle et al.

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