Vertical scaling for digital image data with aperture correction

Details Vertical scaling for digital image data with aperture correction Vertical scaling for digital image data with aperture correction

1995-02-08

1996-12-03

Peng, John K.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348606, 348628, 348630, H04N 5208

Patent

active

055813062

ABSTRACT:
A method of improving the sharpness of horizontal edges of an image that has been vertically scaled. The scaled signal, which represents a series of pixel values, is used to derive an aperture correction value (41-46), which is determined by the scaling ratio and an edge factor. This aperture correction value is added to the scaled signal (47), resulting in enhanced pixel values at edges.

REFERENCES:
patent: 4336552 (1982-06-01), Tanaka
patent: 4504864 (1985-03-01), Anastassiou
patent: 5379074 (1995-01-01), Hwang
patent: 5424783 (1995-06-01), Wong
patent: 5430499 (1995-07-01), Asada et al.

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