Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-08-03
1990-03-27
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358166, 358162, H04N 977
Patent
active
049125516
ABSTRACT:
An enhancing circuit wherein a color difference signal (b) is enhanced by utilizing the change of a luminance siganal (a). The luminance signal (a) is sent, via a low-pass filter (2), a first delay circuit (3), a first differentiation circuit (4), a detector (5), a slicer (6), and a second differentiation circuit (7), to a comparator set (8) to produce two signals (i and j). The two signals (i and j) are sent to first and second sample-and-hold circuits (11 and 12). Meanwhile, the color difference signal (b) is delayed in a second delay circuit (10). In thses two sample-and-hold circuit (11 and 12), such a delayed color difference signal (c) and color difference signal (b) are respectively held in response to the two signals (i and j). Then, such two held signals (I' and II') and the delayed color difference signal (d) are sent to a switching circuit (13) for selecting one of these three signals (I', II', III') in accordance with the combination of the two signals (i and j) thereby producing an enhanced color difference signal (k). Since the luminance signal (a) has a wide frequency band, color-ringing of an image can be satisfactorily reduced.
REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4504853 (1985-03-01), Faroudja
patent: 4541014 (1985-09-01), Yagi
patent: 4581631 (1986-04-01), Sonnenberger
patent: 4729014 (1988-03-01), Flamm et al.
"Picture Signal Improvement in Color TV Receivers" by Hartmut Harlos IEEE Transactions on Consumer Electronics, vol. CE-31, No. 3 Aug. 1985.
Groody James J.
Harvey David E.
Victor Company of Japan Ltd.
LandOfFree
Circuit for enhancing a color difference signal by utilizing the does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for enhancing a color difference signal by utilizing the, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for enhancing a color difference signal by utilizing the will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1655027