Phase responsive composite video signal control system
First Claim
1. A phase responsive video signal correction system for correcting a video parameter of an image represented by a composite video signal, comprising:
- phase detecting means responsive to detect relative phase between a phase encoded component of an uncorrected composite video signal and a reference signal in each one of a plurality of ranges of phases representable by said composite video signal;
correction signal means responsive to said detected relative phase for generating a correction signal related to said detected relative phase; and
means responsive to said correction signal for correcting said uncorrected composite video signal to provide a corrected composite video signal.
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Accused Products
Abstract
A phase responsive video parameter control system operative for correcting hue, saturation, and luminance of a phase encoded component of a composite video signal. A digital phase detector detects the instantaneous hue of the video image, and provides a signal which selects which one of a plurality of color intervals or bands the detected instantaneous hue falls in. Prestored digital correction values associated with the selected color interval are retrieved from memory and converted into analog correction signals which modify the phase, amplitude, and DC level of the composite video signal. New digital correction values, which reflect operator control panel adjustments, may be loaded into memory during the vertical retrace interval, thereby allowing frame-by-frame color correction.
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Citations
59 Claims
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1. A phase responsive video signal correction system for correcting a video parameter of an image represented by a composite video signal, comprising:
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phase detecting means responsive to detect relative phase between a phase encoded component of an uncorrected composite video signal and a reference signal in each one of a plurality of ranges of phases representable by said composite video signal; correction signal means responsive to said detected relative phase for generating a correction signal related to said detected relative phase; and means responsive to said correction signal for correcting said uncorrected composite video signal to provide a corrected composite video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A phase responsive video parameter control system for controlling a video parameter of a portion of a video image represented by a phase-encoded input video signal, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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memory means for storing a plurality of correction signals, each of said correction signals corresponding to a desired value of said video parameter for each one of a plurality of color intervals, each of said color intervals corresponding to one of a plurality of ranges of phase differences between said input video signal and a subcarrier reference signal; phase detecting means responsive to said phase-encoded video signal for detecting said predetermined hue by detecting relative phase between said phase encoded video signal and said subcarrier reference signal and for providing a correction value selection signal related to the detected instantaneous hue of said video image; correction value selecting means responsive to said correction value selection signal for selecting and retrieving a particular one of said plurality of correction signals associated with a particular one of said color intervals stored in said memory means and for providing said particular correction signal as an output, said particular correction signal being related to a particular desired value of said video parameter for said detected instantaneous hue; and means responsive to said particular correction signal for controlling said video parameter to said particular desired value. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A hue responsive video parameter control system for controlling a video parameter of a portion of a video image, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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operator hue selection means for selecting a particular predetermined hue of said video image in response to actuation by an operator; hue detecting means responsive to an input video signal to detect said selected particular predetermined hue and to provide a hue detect signal; memory means for storing a plurality of correction signals, each one of said plurality of correction signals corresponding to a different one of a plurality of predetermined hues; means responsive to said hue detect signal for retrieving a correction signal related to a desired value of a video parameter for said selected particular predetermined hue from said memory means; and means for applying said retrieved correction signal to said input video signal to correct said video parameter to said desired value. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A hue responsive video signal correction system for correcting a video parameter of an image represented by an uncorrected input color video signal, comprising:
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hue detecting means responsive to said input color video signal for detecting hue of said input color video signal in one of a plurality of ranges of hues representable by said input color video signal; and means responsive to said hue detecting means and comprising a single channel circuit for correcting a parameter of said uncorrected input color video signal to provide a corrected color video output signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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43. A phase responsive video signal correction system for correcting a video parameter of an image represented by a color video signal, comprising:
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phase detecting means responsive to detect relative phase between a phase encoded component of an uncorrected color video signal and a reference signal; correction signal means for generating a plurality of correction signals, each of said correction signals being related to a different one of a plurality of ranges of relative phase between said uncorrected color video signal and said reference signal; correction signal selecting means responsive to said detected relative phase detected by said detecting means for selecting a particular one of said correction signals corresponding to one of said ranges of relative phase; and means responsive to said selected correction signal for correcting said uncorrected color video signal to provide a corrected output color video signal.
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44. A video signal color correction system for correcting a video parameter of an image represented by an input color video signal, comprising:
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means for defining a plurality of color control ranges, each of said color control ranges comprising those hues of the visible color spectrum which fall within a region of the spectrum defined by a first boundary of a predetermined first hue and a second boundary of a predetermined second hue; detecting means for detecting when said input color video signals have hues within one of said color control ranges and responsive to provide a hue detect signal; operator control means for providing color control signals indicative of an adjustment of a selected video parameter related to hues within said color control ranges; and means responsive to said hue detect signal for applying said color control signals to said input color video signal.
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45. A video signal color correction system for correcting a video parameter of an image represented by a color video signal, comprising:
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memory means for storing a plurality of correction signals, each of said correction signals corresponding to a color correction for a video parameter having a hue within a predetermined color interval; means responsive to said input color video signal for selecting one of said correction signals stored in said memory means as a function of the instantaneous hue of the video image; and correction means responsive to said selected one of said correction signals for correcting said input color video signal to provide a color corrected video output signal.
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46. A video signal color correction system for correcting a video parameter of an image represented by an input color video signal, comprising:
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means for providing a plurality of color correction regions on a vectorscope representation of said color video signal; memory means for storing a selectively variable correction signal corresponding to corrections for a video parameter; means for detecting when said color video signal is within one of said color correction regions; means for retrieving said correction signal from said memory means in response to said detecting means; and correction means responsive to said retrieved correction signal for correcting said input color video signal to provide a corrected video output signal. - View Dependent Claims (41, 42)
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47. A phase responsive luminance control system for controlling the luminance of a portion of a video image represented by a phase-encoded video signal, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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phase detecting means responsive to detect said predetermined hue by detecting relative phase between said phase-encoded video signal and a reference signal in each one of a plurality of ranges of phases representable by said phase-encoded video signal; luminance controlling means responsive responsive to said detected relative phase for generating a correction signal related to said detected relative phase; and means responsive to said correction signal for controlling luminance in a video signal corresponding to said phase encoded video signal. - View Dependent Claims (48, 49)
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50. A phase responsive chrominance control system for controlling the chrominance of a portion of a video image represented by a chrominance signal, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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phase detecting means responsive to detect said predetermined hue by detecting relative phase between said chrominance signal and a reference signal in each one of a plurality of ranges of phases representable by said chrominance signal; correction signal means responsive to said detected relative phase for generating a correction signal related to said detected relative phase; and means responsive to said correction signal for controlling said chrominance signal to provide a corrected chrominance signal. - View Dependent Claims (51, 52, 53, 54)
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55. A phase responsive video signal correction system for correcting a video parameter of an image represented by a composite video signal, comprising:
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phase detecting means responsive to detect relative phase between a phase encoded component of an uncorrected composite video signal and a reference signal; correction signal means responsive to said detected relative phase for generating a correction signal related to said detected relative phase; and means responsive to said correction signal for selectively correcting a luminance portion of a particular hue represented by said uncorrected composite video signal to provide a corrected composite video signal.
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56. A phase responsive video parameter control system for controlling a video parameter of a portion of a video image represented by a phase-encoded video signal, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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memory means for storing a plurality of correction signals, each of said correction signals corresponding to a desired value of said video parameter for a particular instantaneous hue; phase detecting means responsive to said phase-encoded video signal for detecting said predetermined hue by detecting relative phase between said phase encoded video signal and a subcarrier reference signal and for providing a correction value selection signal related to a detected instantaneous hue of said video image; means for dividing each cycle of said subcarrier reference signal into a plurality of discrete color intervals, each of said color intervals being related to a particular one of said correction signals stored in said memory means; correction value selecting means responsive to said correction value selection signal for selecting and retrieving a particular one of said plurality of correction signals associated with a particular one of said color intervals stored in said memory means and for providing said particular correction signal as an output, said particular correction signal being related to a particular desired value of said video parameter for said detected instantaneous hue; and means responsive to said particular correction signal for controlling said video parameter to said particular desired value.
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57. A phase responsive video parameter control system for controlling a video parameter of a portion of a video image represented by a phase-encoded video signal, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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memory means for storing a plurality of correction signals, each of said correction signals corresponding to a desired value of said video parameter for a particular instantaneous hue; phase detecting means responsive to said phase-encoded video signal for detecting said predetermined hue by detecting relative phase between said phase encoded video signal and a subcarrier reference signal and for providing a correction value selection signal related to a detected instantaneous hue of said video image; correction value selecting means responsive to said correction value selection signal for selecting and retrieving a particular one of said plurality of correction signals stored in said memory means and for providing said particular correction signal as an output, said particular correction signal being related to a particular desired value of said video parameter for said detected instantaneous hue; means responsive to said particular correction signal for controlling said video parameter to said particular desired value; operator control means for providing updated correction signals in response to actuation by an operator to indicate a desired change in control; and means for periodically storing said updated correction signals in said memory means during an external access mode.
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58. A phase responsive video parameter control system for controlling a video parameter of a portion of a video image, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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means for developing a phase-encoded video signal representative of a video image to be controlled; operator hue selection means for selecting a particular predetermined hue of said video image in response to actuation by an operator; phase detecting means responsive to said phase-encoded video signal to detect said selected particular predetermined hue by detecting relative phase between said phase-encoded video signal and a subcarrier reference signal; means responsive to said detected relative phase for generating a correction signal related to a desired value of a video parameter for said selected particular predetermined hue; memory means for storing a plurality of correction signals, each one of said plurality of correction signals corresponding to a different one of a plurality of predetermined hues; second memory means for storing a plurality of sets of said correction signals, each one of said sets corresponding to a particular plurality of said correction signals associated with a particular video image; and means responsive to said correction signal for correcting said video parameter to said desired value.
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59. A phase responsive video parameter control system for controlling a video parameter of a portion of a video image, said portion of said video image being at least partially defined by a predetermined hue, comprising:
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means for developing a phase-encoded video signal representative of a video image to be controlled; operator hue selection means for selecting a particular predetermined hue of said video image in response to actuation by an operator; phase detecting means responsive to said phase-encoded video signal to detect said selected particular predetermined hue by detecting relative phase between said phase-encoded video signal and a subcarrier reference signal; memory means for storing a plurality of sets of a plurality of correction signals, each one of said sets being associated with a different video image, said memory means being responsive to provide a particular one of said sets of correction signals in response to receipt of a scene change signal indicative of a change in video images; means responsive to said detected relative phase for retrieving from said memory means one of said correction signals related to a desired value of a video parameter for said selected particular predetermined hue; and means responsive to said correction signal for correcting said video parameter to said desired value.
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Specification