Interpolating component generator for scanning line interpolator

Details Interpolating component generator for scanning line interpolator Interpolating component generator for scanning line interpolator

1993-10-18

1996-01-09

Groody, James J.

Television

Format conversion

Line doublers type

348451, H04N 701, H04N 1120

Patent

active

054832888

ABSTRACT:
An interpolating component generator for a scanning line interpolator using pseudo median filters wherein in generating an interpolating component signal required for converting an image signal of the interlaced scanning system into an image signal of the progressive scanning system, a determination is made whether an inter-field variation is larger than an intra-field variation, based on a determination signal from an inter-field/intra-field determination processor so that an intra-field pseudo median filter is used when the inter-field variation is larger than the intra-field variation, whereas an inter-field pseudo median filter is used when the intra-field variation is larger than the inter-field variation, so as to calculate a pixel value to be finally used in interpolation, thereby solving problems such as a step edge phenomenon and a reduced vertical resolution encountered in fixed intra-field or inter-field interpolation systems, an overlap phenomenon occurring in median filters, arid an increase in cost and a failure to consider diagonal components in Faroudja's temporal median filter system.

REFERENCES:
patent: 4989090 (1991-01-01), Campbell et al.
patent: 5051826 (1991-09-01), Ishii et al.
patent: 5070394 (1991-12-01), Kobayashi
patent: 5315699 (1994-05-01), Imai et al.

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