Method and apparatus for video image film simulation
First Claim
1. A method for simulating the appearance of film recorded images in a video signal comprising the steps of:
- receiving a composite video signal input;
distributing the signal input as a first signal, a second signal, a third signal and a fourth signal;
delaying the second signal for a first time period equivalent to the period of a first video field to produce a first delayed signal;
delaying the third signal for a second time period equivalent to the period of a second video field to produce a second delayed signal;
summing the first signal with the first delayed signal to produce an "A" field;
summing the first signal with the second delayed signal;
delaying the summed first signal and second delayed signal for a time period equivalent to the first time period to produce a "B" field;
repetatively selecting between the A field and B field in a sequence of A-B-A-B-B-A-B-A-B-B to produce an internal signal;
delaying the internal signal for a time period equivalent to the sum of the first and second time periods to produce an "A'"'"'" field;
selecting between the internal signal and the "A'"'"'" field to repetatively produce a sequence of A-B-A-B-A'"'"' to produce a processed video signal;
delaying the fourth signal for a time period equivalent to the circuit delay between the first signal and the processed video signal; and
,selecting the processed video signal during the picture portion of the signal and the delayed fourth signal during the non-picture portion of the signal for a processed video output.
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Accused Products
Abstract
Video signals from pre-recorded video tape or a video camera are received by the present invention and processed to provide the appearance of a motion picture film recorded image. The output of the invention may be provided directly for television broadcast or recording on video tape. Simulation of film frames is provided by summing a real time signal and delayed signals to create an interpolation of preceding and succeeding video fields. Addition of mixed, clipped and filtered noise to provide the appearance of grain in photographic film and alteration of the apparent contrast provide variable artistic attributes which are adjustable for the desired film appearance.
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Citations
12 Claims
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1. A method for simulating the appearance of film recorded images in a video signal comprising the steps of:
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receiving a composite video signal input; distributing the signal input as a first signal, a second signal, a third signal and a fourth signal; delaying the second signal for a first time period equivalent to the period of a first video field to produce a first delayed signal; delaying the third signal for a second time period equivalent to the period of a second video field to produce a second delayed signal; summing the first signal with the first delayed signal to produce an "A" field; summing the first signal with the second delayed signal; delaying the summed first signal and second delayed signal for a time period equivalent to the first time period to produce a "B" field; repetatively selecting between the A field and B field in a sequence of A-B-A-B-B-A-B-A-B-B to produce an internal signal; delaying the internal signal for a time period equivalent to the sum of the first and second time periods to produce an "A'"'"'" field; selecting between the internal signal and the "A'"'"'" field to repetatively produce a sequence of A-B-A-B-A'"'"' to produce a processed video signal; delaying the fourth signal for a time period equivalent to the circuit delay between the first signal and the processed video signal; and
,selecting the processed video signal during the picture portion of the signal and the delayed fourth signal during the non-picture portion of the signal for a processed video output. - View Dependent Claims (2, 3)
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4. An apparatus for modifying a video signal to simulate the appearance of film recorded images comprising:
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means for receiving a composite video signal; a first delay means for receiving the composite video signal and providing an output signal with a first delay; a second delay means for receiving the composite video signal as an input and providing a signal output with a second delay; a first summing means for receiving the output signal of the first delay means and summing that signal with the composite video signal to produce an A field; second summing means for summing the output of the second delay means with the composite video signal; a third delay means receiving the summed composite video signal and second delayed signal and providing a signal output with a delay equal to the first delay as a B field; first switching means to selectably transmit the A field and B field; a fourth delay means connected to the first switch means providing a signal output with a delay equal to the sum of the first and second delay; a second switch means for selectably transmitting the signal transmitted by the first switch means and the output of the fourth delay means; a fifth delay means receiving the composite video signal and providing a signal output having a delay equal to the circuit delay of the signal transmitted through the second switch means; a third switch means selectably transmitting the signal transmitted by the second switch means and the signal output of the fifth delay means to provide a process video output; and control means for selecting the transmitted signals of the first, second and third switch means. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification