Flicker processor for cinema video assist
First Claim
1. A video assist system, comprisingmeans for receiving a motion-picture image at a frame rate of a motion-picture camera;
- television camera means for receiving said motion-picture image and for generating an intermittent signal, said intermittent signal having frame in synchrony with a set of frames of said motion-picture image and having image data in each frame disposed at a television rate;
means for storing a substantially unprocessed form of said intermittent signal, having both control signals and data, in a field buffer; and
means for reading a continuous television output signal, having both a set of television control signals and a set of television data, from said field buffer.
4 Assignments
0 Petitions
Accused Products
Abstract
In a video assist system, an intermittent composite video signal produced by a modified television camera from a motion-picture image is converted to a composite video output signal in a continuous television format, by writing a largely unprocessed intermittent signal (including composite color, intensity and timing information) into a field buffer and reading a continuous television output signal (including both control elements and data) from that field buffer. The field buffer may comprise multiplexed banks of static RAM, with separate read address and write address generators for reading and writing data independently. When a field is repeated on output, an even-lines field may follow a previous even-lines field or an odd-lines field may follow a previous odd-lines field. It is not necessary to synchronize the phase of the video assist system with the motion-picture camera, and it is possible to retrieve television image frames at a divisor of the motion-picture camera frame rate to work with a brighter image.
-
Citations
39 Claims
-
1. A video assist system, comprising
means for receiving a motion-picture image at a frame rate of a motion-picture camera; -
television camera means for receiving said motion-picture image and for generating an intermittent signal, said intermittent signal having frame in synchrony with a set of frames of said motion-picture image and having image data in each frame disposed at a television rate; means for storing a substantially unprocessed form of said intermittent signal, having both control signals and data, in a field buffer; and means for reading a continuous television output signal, having both a set of television control signals and a set of television data, from said field buffer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A device for converting a motion-picture image to a television signal, comprising
a television camera, disposed to receive said motion-picture image, having a horizontal synchronization signal input and a vertical synchronization input, capable of operating at a rate other than a standard television rate; -
an A/D converter, coupled to an analog output of said television camera; a dual-port memory, coupled to a digital output of said A/D converter; a D/A converter, coupled to an output of said dual-port memory;
whereby an output of said D/A converter is suitable for use as a television signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
-
19. Apparatus for the conversion of an optical image available through the optical system of the viewfinder of a motion-picture camera to a standard television signal for viewing and recording at a remote location, comprising
a television camera capable of accepting horizontal and vertical synchronization signals from an external source; -
an analog to digital converter connected to said television camera for converting the analog video signal at the output of said camera into an equivalent digital output; a dual port memory connected to said analog to digital converter for simultaneously storing the digital output signal from said analog to digital converter and simultaneously reading out portions of said signal; a digital to analog converter connected to said dual port memory for converting the output of said dual port memory from digital to analog format, whereby said analog format is suitable for use as a standard video signal for video monitors and recorders; a first address generator comprising counting, incrementing, resetting and offsetting circuits for generating write addresses for said dual port memory and connected to the address bus of said dual port memory by means of gating circuits; a second address generator comprising counting, incrementing, resetting and gating circuits for generating read addresses for said dual port memory and connected to the address bus of said dual port memory by means of gating circuits; a first vertical time-base for generating vertical synchronization signals compatible with a frame rate of a motion-picture camera and connected to a vertical synchronization input for said television camera and to a resetting and a presetting input of said first address generator; a second vertical time-base for generating a standard television vertical synchronization signal and connected to a resetting input of said second address generator; a horizontal time-base for generating horizontal standard television synchronization signals connected to a clock input of said first time-base, to a clock input of said second time-base, and to a horizontal synchronization input of said television camera; a waveform generator for generating a set of master clock and logic control signals for said dual port memory, said first and second time-bases, said first and second address generators, said analog to digital converter, and said digital to analog converter.
-
-
20. A method of operating a video assist system, comprising the steps of
receiving a motion-picture image at a predetermined frame rate; -
receiving said motion-picture image and generating an intermittent signal, said intermittent signal having frame in synchrony with a set of frame of said motion-picture image and having image data in each frame disposed at a television rate; storing a substantially unprocessed form of said intermittent signal, having both control signals and data, in a field buffer; and reading a continuous television output signal, having both a set of television control signals and a set of television data, from said field buffer. - View Dependent Claims (21, 22, 23)
-
-
24. A video assist system, comprising
a television camera capable of accepting horizontal and vertical synchronization signals from an external source and capable of integrating a received television image field for a duration substantially equal to a whole frame, said television camera generating a composite television signal; -
an image buffer coupled to said composite television signal; means for storing said composite television signal in said image buffer in a substantially unmodified form; means for retrieving said composite television signal from said image buffer. - View Dependent Claims (25, 26)
-
-
27. A method of operating a video assist system, comprising the steps of
accepting horizontal and vertical synchronization signals from an external source, integrating a received television image field for a duration substantially equal to a whole frame in response thereto, and generating a composite television signal in response thereto; -
storing said composite television signal in an image buffer in a substantially unmodified form; retrieving said composite television signal from said image buffer. - View Dependent Claims (28, 29)
-
-
30. A video assist system, comprising
means for receiving a motion-picture image and for generating an intermediate video image signal in response thereto; -
means for storing a substantially unprocessed form of said intermediate video image signal in a field buffer; and means for retrieving a continuous signal from said field buffer at a television standard. - View Dependent Claims (31, 32, 33, 34)
-
-
35. A method of operating a video assist system, comprising the steps of
receiving a motion-picture image and generating an intermediate video image signal in response thereto; -
storing a substantially unprocessed form of said intermediate video image signal in a field buffer; and retrieving a continuous signal from said field buffer at a television standard. - View Dependent Claims (36, 37, 38, 39)
-
Specification