Progressive scan display system having intra-field and inter-fie

Details Progressive scan display system having intra-field and inter-fie Progressive scan display system having intra-field and inter-fie

1986-09-29

1987-10-06

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358160, H04N 701

Patent

active

046986758

ABSTRACT:
An interlaced video input signal is applied to a speed-up unit which time compresses and interleaves lines of the input signal with lines of a further signal derived therefrom for display in progressive scan fashion on a display device. The further signal is generated by circuitry which derives line-interpolated, field-delayed and vertical detail signals from the input signal. Selection circuitry selects the field delayed signal for display when the detail signal is above a threshold level and the field-delayed signal is concurrently within a range bounded by the input signal and the line-delayed signal, the interpolated signal being selected for display otherwise to thereby provide a progressive scan display having relatively high vertical detail characteristic of interfield processing and immunity to motion artifacts characteristic of intra-field processing. Noise due to quantizing errors or poor input signal-to-noise conditions is further reduced by range extension circuitry which increases the selection range beyond the values bounded by the input and line-delayed signals for selection of the field-delayed signal.

REFERENCES:
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patent: 4400719 (1983-08-01), Powers
patent: 4415931 (1983-11-01), Dischert
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patent: 4583113 (1986-04-01), Pritchard
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patent: 4630098 (1986-12-01), Fling
patent: 4641188 (1987-02-01), Dischert
Murata et al., "A Consumer Use Flicker Free Color Monitor Using Digital Signal Processing" IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug. 1986, pp. 215-227.

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