Circuit for enhancing a color difference signal by utilizing the

Details Circuit for enhancing a color difference signal by utilizing the Circuit for enhancing a color difference signal by utilizing the

1990-01-19

1990-12-25

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 514

Patent

active

049807552

ABSTRACT:
An enhancing circuit wherein a color difference signal (b) is enhanced by utilizing the change of a luminance signal (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 these two sample-and-hold circuit (11 and 12), such a delayed color difference signal (c) and color different 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 Harolos IEEE Transactions on Consumer Electronics, vol. CE-31, No. 3, Aug. 1985.

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