Boots – shoes – and leggings
Patent
1991-09-17
1993-11-16
Mai, Tan V.
Boots, shoes, and leggings
G06G 702
Patent
active
052629783
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: 4181917 (1980-01-01), Richman
patent: 4183051 (1980-01-01), Richman
patent: 4598310 (1986-07-01), Brand et al.
patent: 4789897 (1988-12-01), Koppeler et al.
patent: 4951127 (1990-08-01), Mehrgardt et al.
Mai Tan V.
Victor Company of Japan Ltd.
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