EP0262927A2
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EP
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Progressive scan display system having intra-field and interfield processing modes
Assignee: RCA Licensing Corp
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Filing: 1987-09-29
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Granted: —
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Expires: 2007-09-29
Abstract
Abstract An interlaced video input signal is applied to a speed-up unit (20) 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 (56-62,80-84) which derives line-interpolated, field-delayed and vertical detail signals from the input signal. Selection circuitry (54,70,86,88) selects the field delayed signal for display (24) when the detail signal (D) is above a threshold level and the field-delayed signal (C) is concurrently within a range bounded by the input signal (B) and the line-delayed signal (A), the interpolated signal (I) 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 (72) which increases the selection range beyond the values bounded by the input and line-delayed signals for selection of the field-delayed signal.
Inventors
- 👤 Robert Francis Casey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:02
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
144 words
In a progressive scan display system of the type comprising processor means for deriving a processed video signal for display from a video input signal, speed-up means for time compressing and interleaving lines of said input and processed video signals and display means for displaying the interleaved lines in progressive scan fashion, characterized in that said processor means comprises: first means (56-62,80-84) for deriving a line-delayed video signal, a field-delayed video signal, a line-interpolated video signal and a vertical detail signal from said video input signal; and second means (54,70,86,88) for selecting said field-delayed video signal for application to said speed-up means as said processed video signal when said detail signal is greater than a threshold value and said field-delayed signal is concurrently within a range of values bounded by said input and line-delayed signals and for selecting said line interpolated video signal otherwise.
Claim 2
Dependent Claim
144 words
In a progressive scan display system of the type comprising processor means for deriving a processed video signal for display from a video input signal, speed-up means for time compressing and interleaving lines of said input and processed video signals and display means for displaying the interleaved lines in progressive scan fashion, characterized in that said processor means comprises: first means (56-62,80-84) for deriving a line-delayed video signal, a field-delayed video signal, a line-interpolated video signal and a vertical detail signal from said video input signal; and second means (54,70,86,88) for selecting said field-delayed video signal for application to said speed-up means as said processed video signal when said detail signal is greater than a threshold value and said field-delayed signal is concurrently within a range of values bounded by said input and line-delayed signals and for selecting said line interpolated video signal otherwise.
Claim 3
Dependent Claim
41 words
A progressive scan display system as recited in Claim 1 characterized in that said second means includes range extension means for extending said range of values to a range greater than said values bounded by said input and line-delayed video signals.
Claim 4
Dependent Claim
58 words
A progressive scan display system as recited in Claim 1 characterized in that said range of values includes an upper limiting value equal to the greater in a first sense of said input and line-delayed video signals and includes a lower limiting value equal to the lesser in a second sense of said input and line-delayed video signals.
Claim 5
Dependent Claim
64 words
A progressive scan display system as recited in Claim 1 characterized in that said range of values includes a first limiting value equal to a sum of a range control signal plus the greater of said input and line-delayed signals and includes a second limiting value equal to a difference of the lessor of said input and line-delayed signals minus said range control signal.
Claim 6
Dependent Claim
99 words
A progressive scan display system as recited in Claim 1 characterized in that said second means comprises: comparison means for determining if said field delayed video signal is within a first range of values and a second range of values, each range having upper and lower bounds which vary as a function of said input and line-delayed signals; and logic means coupled to said comparision means for selecting said field-delayed video signal when said detail signal is greater than said threshold value and said field-delayed video signal is concurrently within one of said first and second ranges of values.
Claim 7
Dependent Claim
70 words
A progressive scan display system as recited in Claim 1 characterized in that said first means includes means for subtractively combining said input and line-delayed video signals to provide a difference signal and means for forming an absolute value signal from said difference signal, and said second means includes comparing means for comparing said absolute value signal with a reference signal for generating a vertical detail responsive threshold control signal.
Claim 8
Dependent Claim
158 words
A progressive scan display system, characterized by: input means for receiving an interlaced video input signal and providing a line-delayed video output signal, a field-delayed video output signal, a line-interpolated video output signal and a vertical detail signal; selection means coupled to said input means for providing a selected video output signal corresponding to said field-delayed video output signal when said vertical detail signal is greater than a threshold value and said field-delayed video output signal is concurrently within a range of values having upper and lower bounds controlled as a function of said input and line-delayed video signals, said selected video output signal corresponding to said line-interpolated video output signal otherwise; display means; and speed-up means coupled to said input means and said selection means for time compressing and interleaving lines of said input and selected video signals and coupled to supply the time compressed interleaved lines to said display means for display in progressive scan fashion.
Claim 9
Dependent Claim
158 words
A progressive scan display system, characterized by: input means for receiving an interlaced video input signal and providing a line-delayed video output signal, a field-delayed video output signal, a line-interpolated video output signal and a vertical detail signal; selection means coupled to said input means for providing a selected video output signal corresponding to said field-delayed video output signal when said vertical detail signal is greater than a threshold value and said field-delayed video output signal is concurrently within a range of values having upper and lower bounds controlled as a function of said input and line-delayed video signals, said selected video output signal corresponding to said line-interpolated video output signal otherwise; display means; and speed-up means coupled to said input means and said selection means for time compressing and interleaving lines of said input and selected video signals and coupled to supply the time compressed interleaved lines to said display means for display in progressive scan fashion.
Claim 10
Dependent Claim
37 words
A progressive scan display system as recited in Claim 7 characterized in that said selection means further comprises range extension means for extending said range of values to a range greater than said upper and lower bounds.
Claim 11
Dependent Claim
44 words
A progressive scan display system as recited in Claim 7 characterized in that said upper bound is equal to the greater of said input and line-delayed video signals, and said lower bound is equal to the lesser of said input and line-delayed video signals.
Claim 12
Dependent Claim
58 words
A progressive scan display system as recited in Claim 7 characterized in that said upper bound is equal to a sum of a range control signal plus the greater of said input and line-delayed signals and said lower bound is equal to a difference of the lessor of said input and line-delayed signals minus said range control signal.
Claim 13
Dependent Claim
69 words
A progressive scan display system as recited in Claim 7 characterized in that said input means includes means for subtractively combining said input and linedelayed video signals to provide a difference signal and for forming an absolute value signal from said difference signal, and said selection means includes comparing means for comparing said absolute value signal with a reference signal for generating a vertical detail responsive threshold control signal.
Claim 14
Dependent Claim
168 words
A progressive scan display system, characterized by: circuit means having input means for receiving an interlaced video input signal having a given line rate and output means for providing an interpolated video output signal and a vertical detail signal, each derived from adjacent vertical lines of said input signal, and for providing a line-delayed output signal and a field-delayed output signal; display means; speed-up means coupled to said circuit means for time compressing and interleaving lines of said input signal and a further signal supplied thereto and coupled to said display means for displaying said time compressed and interleaved signals in progressive scan fashion; and selection means for applying said field-delayed signal to said speed-up means as said further signal when said detail signal is greater than a threshold level and said field-delayed signal is concurrently within a selected one of first and second ranges values bounded by said input and line-delayed signals and for applying said interpolated signal to said speed-up means as said further signal otherwise.
Claim 15
Dependent Claim
168 words
A progressive scan display system, characterized by: circuit means having input means for receiving an interlaced video input signal having a given line rate and output means for providing an interpolated video output signal and a vertical detail signal, each derived from adjacent vertical lines of said input signal, and for providing a line-delayed output signal and a field-delayed output signal; display means; speed-up means coupled to said circuit means for time compressing and interleaving lines of said input signal and a further signal supplied thereto and coupled to said display means for displaying said time compressed and interleaved signals in progressive scan fashion; and selection means for applying said field-delayed signal to said speed-up means as said further signal when said detail signal is greater than a threshold level and said field-delayed signal is concurrently within a selected one of first and second ranges values bounded by said input and line-delayed signals and for applying said interpolated signal to said speed-up means as said further signal otherwise.
Claim 16
Dependent Claim
36 words
A progressive scan display system as recited in Claim 12 characterized in that said selection means further includes range extension means for increasing each of said first and second ranges of values by a predetermined amount.
References Cited (Backward Citations)
No citation records indexed.
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