Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-09-29
1996-12-31
Lee, Michael H.
Television
Image signal processing circuitry specific to television
Gray scale transformation
382274, 382261, H04H 552
Patent
active
055898904
ABSTRACT:
A filter architecture particularly for video applications, includes a filter section for separating high pass and low pass components from a video input signal conveying a video image, a brilliance estimating section for determining a mean brilliance value for each of a plurality of sections into which the video image is divided, first and second image characteristic adjusting sections for modifying the high pass and low pass components in response to the mean brilliance values, and a summing section for combining the modified high pass and low pass components to generate a filtered video signal. The first and second image characteristic adjusting sections operate using Fuzzy Logic which enables the filter architecture to effectively adjust contrast and brightness in the video image over a wide range of image brightness values.
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patent: 4667304 (1987-05-01), Hier et al.
patent: 5162902 (1992-11-01), Bell et al.
Kaufman et al., Hardware Realization of 2-D 11R Semisystatic Filter With Application to Real-Time Homomarphic Filtering, Feb. 1993, pp. 2-14.
Peli et al., Adaptive Filtering for Image Enhancement, Jan. 1982 vol. 21, No. 1, pp. 108-112.
Patent Abstracts of Japan, vol. 17, No. 219 (E-1358) Apr. 30, 1993 & JP-A-04354268 (Matsushita).
Mancuso Massimo
Poluzzi Rinaldo
Rizzotto Gianguido
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
Driscoll David M.
Lee Michael H.
Morris James H.
SGS--Thomson Microelectronics S.r.l.
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