Digital convergence correction system and method for preparing c

Details Digital convergence correction system and method for preparing c Digital convergence correction system and method for preparing c

1993-02-11

1994-09-06

Groody, James J.

Television

Video display

Projection device

348746, 348806, 31536812, 31536813, H04N 928

Patent

active

053452801

ABSTRACT:
A digital convergence correction system and a method of preparing a convergence correction data used for an image display unit, including at least one cathode ray tube, are disclosed. Correction data at correction points at predetermined between adjusting points providing representative correction points are determined by interpolation. A whole section subjected to correction is segmented into a plurality of sub-sections. An interpolating function for each sub-section is an independent low-order function. The values of the interpolating functions for adjacent sub-sections sandwiching a boundary, i.e., an adjusting point, the values of the first order derivatives and the values of the second order derivatives, respectively, are rendered to be equal to each other at such adjusting point.

REFERENCES:
patent: 4672275 (1987-06-01), Ando
patent: 4673847 (1987-06-01), Louie et al.
patent: 4816908 (1989-03-01), Colineau et al.
patent: 5216497 (1943-06-01), Tsujihara et al.

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