Method and arrangement for furnishing a correcting of errors in the registration of rasters in color television cameras

Claim 2

In a TV camera having color signal furnishing means each furnishing color signals within a corresponding raster, said rasters including a reference raster, a method for furnishing a correction signal for correcting the registration of said rasters relative to said reference raster, comprising, in combination, the steps of limiting the amplitude of said color signals to an amplitude range between a first and second predetermined amplitude, thereby creating limited color signals having amplitude discontinuities; creating a plurality of first pulses, each in response to one of said amplitude discontinuities; creating second pulses having predetermined pulse width in response to said first pulses, said second pulses including broad second pulses associated with said reference raster and narrow second pulses, each of said broad and narrow second pulses having a trailing edge; creating primary and secondary third pulses having a pulse width corresponding to the pulse width of said broad second pulses in response to the trailing edges of said broad and narrow second pulses, respectively; creating first difference signals corresponding to the difference in amplitude between said broad second pulses and said secondary third pulses, said first difference signal having positive and negative components; creating second difference signals corresponding to the difference between said primary and secondary third pulses, said second difference signals having positive and negative components; creating a sum signal having positive components corresponding to the positive components of said first difference signal and negative components corresponding to the negative components of said second difference signal; and integrating said sum signal thereby creating said correction signal.

Claim 3

A method as set forth in claim 1, wherein said correction signal comprises a horizontal correction signal for horizontal deflection correction and a vertical correction signal for vertical deflection correction; and wherein the width of said first pulses when creating said horizontal correction signal is approximately equal to the persistence time of an image spot.

Claim 4

A method as set forth in claim 1, wherein said correction signal comprises a horizontal correction signal for horizontal deflection correction and a vertical deflection signal for vertical deflection correction; and wherein the pulse width of said first pulses when used for creating said vertical correction signal substantially equal to a line duration.

Claim 5

A method as set forth in claim 1, further comprising the step of analyzing said color signals and creating said correction signal only in the presence of color signals indicative of a sharp and low color content picture.

Claim 6

A method as set forth in claim 1, wherein each of said rasters has a first, second and third vertical section respectively corresponding to the beginning, middle and end portion of the corresponding horizontal sweep; wherein furnishing a correction signal comprises furnishing, in time sequence, a first horizontal correction signal for correcting the position of said raster in the horizontal direction, a second horizontal correction signal for correcting the size of said raster in the horizontal direction, a third horizontal correction signal for recorrecting the position of said raster in the horizontal direction, and a fourth horizontal correction signal for correcting the linearity of said raster in the horizontal direction; and wherein said color signals are derived from said second, third, first and second vertical sections, respectively when creating said first, second, third and fourth horizontal correction signals.

Claim 7

The method as set forth in claim 1, wherein said television camera furnishes vertical sweep signals; wherein said rasters have a first, second and third horizontal section respectively corresponding to the beginning, middle and end of said vertical sweeps; wherein furnishing said correction signals comprises furnishing a first, second and third vertical correction signal in time sequence, for respectively correcting the position, size, and linearity of said raster in the vertical direction; and wherein said color signals are derived from said second, third and first horizontal section when creating said first, second and third vertical correction signals, respectively.

Claim 8

In a color television camera having at least a first and second pick-up tube respectively furnishing first and second color signals and a first and second raster, a system for furnishing a correction signal for automatically correcting the registration of said first and second rasters, comprising, in combination, amplifying means for amplifying and limiting said first and second color signals; program means furnishing programming signals; switch means having a first and second switch output, connected to said amplifying means and said progRam means, for furnishing, under control of said programming signals, selected ones of said first color signals at said first switch output and selected ones of said second color signals at said second switch output; converter means connected to said first and second switch outputs for furnishing primary and secondary first pulses in response to discontinuities in said first and second selected and limited color signals, respectively; first and second monostable circuit means connected to the output of said converter means for furnishing broad and narrow second pulses in response to said primary and secondary first pulses, respectively, said broad pulses having a predetermined pulse width relative to said narrow pulses; third and fourth monostable circuit means respectively connected to the output of said first and second monostable circuit means, for furnishing primary and secondary third pulses respectively, in response to the trailing edges of said broad and narrow second pulses, respectively, said primary and secondary third pulses having a pulse width substantially equal to the pulse width of said broad second pulses; first difference amplifier means having a first and second input respectively connected to the output of said first and second monostable circuit means, for furnishing a first difference signal corresponding to the difference therebetween; second difference amplifier means connected to the output of said third and fourth monostable circuit means, for furnishing a second difference signal corresponding to the difference therebetween, said first and second difference signals each having a positive and a negative portion; and summing amplifier means connected to the outputs of said first and second difference amplifier means, for adding said positive portion of said first difference signal to said negative portions of said negative difference signals, thereby creating a sum signal, said so created sum signal constituting said correction signal.

Claim 9

In a color television camera having at least a first and second pick-up tube respectively furnishing first and second color signals and a first and second raster, a system for furnishing a correction signal for automatically correcting the registration of said first and second rasters, comprising, in combination, amplifying means for amplifying and limiting said first and second color signals; program means furnishing programming signals; switch means having a first and second switch output, connected to said amplifying means and said progRam means, for furnishing, under control of said programming signals, selected ones of said first color signals at said first switch output and selected ones of said second color signals at said second switch output; converter means connected to said first and second switch outputs for furnishing primary and secondary first pulses in response to discontinuities in said first and second selected and limited color signals, respectively; first and second monostable circuit means connected to the output of said converter means for furnishing broad and narrow second pulses in response to said primary and secondary first pulses, respectively, said broad pulses having a predetermined pulse width relative to said narrow pulses; third and fourth monostable circuit means respectively connected to the output of said first and second monostable circuit means, for furnishing primary and secondary third pulses respectively, in response to the trailing edges of said broad and narrow second pulses, respectively, said primary and secondary third pulses having a pulse width substantially equal to the pulse width of said broad second pulses; first difference amplifier means having a first and second input respectively connected to the output of said first and second monostable circuit means, for furnishing a first difference signal corresponding to the difference therebetween; second difference amplifier means connected to the output of said third and fourth monostable circuit means, for furnishing a second difference signal corresponding to the difference therebetween, said first and second difference signals each having a positive and a negative portion; and summing amplifier means connected to the outputs of said first and second difference amplifier means, for adding said positive portion of said first difference signal to said negative portions of said negative difference signals, thereby creating a sum signal, said so created sum signal constituting said correction signal.

Claim 10

An arrangement as set forth in claim 7, further comprising low pass filter means connected to the output of said summing amplifier means.

Claim 11

An arrangement as set forth in claim 8, wherein said correction signal comprises a horizontal correction signal for correcting the registration of said raster in the horizontal direction and a vertical correction signal for correcting the registration of said raster in the vertical direction; wherein said converter means and said first, second, third and fourth monostable circuit means are horizontal converter and monostable circuit means; further comprising corresponding vertical converter and monostable circuit means; and H/V switch means connected to said program means and to said third and fourth horizontal and vertical monostable circuit means for alternatively connecting said third and fourth horizontal or said third and fourth vertical monostable circuit means to the inputs of said first and second difference amplifying means under control of said programming signals.

Claim 12

An arrangement as set forth in claim 8, wherein said first and second color signals are respectively, green and red color signals; further comprising third puck-up tube means furnishing blue color signals.

Claim 13

An arrangement as set forth in claim 10, wherein said switch means comprise means for furnishing said green color signals at first switch output, and said red and blue color signals at said second switch output in response to said programming signals.

Claim 14

An arrangement as set forth in claim 7, further comprising signal analyzer means connected to said amplifying means and said switch means for blocking said switch means in the presence of signals having excessive rise times or excessive color content.