Image enhancement system

Details Image enhancement system Image enhancement system

1992-01-29

1993-12-07

Nguyen, Long T.

Boots, shoes, and leggings

G06G 702

Patent

active

052688607

ABSTRACT:
Signal components of the luminance signal are delayed by a 90.degree. phase by a first filter and pass therethrough, where the closer the frequencies of the signal components to the upper limit frequency of the frequency bandwidth of the luminance signal, the less the signal components attenuated. The signal components also pass through a second filter, where the phase of the signal components do not change, the closer the frequencies of the signal components to the upper limit frequency of the frequency bandwidth, the less the signal components attenuated. The signal components that have a phase difference of 90.degree. with respect to each other and that pass through each of the filters undergo vector composition to generate a signal that has an amplitude which is the root of the sum of the squares of the two amplitudes. A signal that has the same phase as the signal component that passes through the second filter and that has the same amplitude as the amplitude of the signal subjected to the vector composition is then generated. From this signal the signal component that passes through the second filter is subtracted to generate the edge emphasis component. This edge emphasis component is added to the luminance signal to emphasize the edge of an image.

REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4160265 (1979-07-01), Tanaka
patent: 4941190 (1990-07-01), Joyce
patent: 4972359 (1990-11-01), Silver et al.
patent: 5063448 (1991-11-01), Jaffray et al.

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