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Method and apparatus for producing a composite still picture of a moving object in successive positions

  • US 4,005,261 A
  • Filed: 11/20/1975
  • Issued: 01/25/1977
  • Est. Priority Date: 11/26/1974
  • Status: Expired due to Term
First Claim
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1. A method of operating a storage-type image pick-up tube provided with a shutter, and a memory device for producing a composite video signal representing an image of a moving object in an initial position and changes from said position of the object at intervals over a period of time, comprising:

  • a first step of opening said shutter while operating said pick-up tube to pick-up an image of said object in an initial position thereof and to produce a corresponding first video signal, and simultaneously applying said first video signal to said memory device for storage in the latter;

    a second step of closing said shutter while readingout the signal previously stored in said memory device and storing the read-out signal in said pick-up tube;

    a third step of opening said shutter while operating said pick-up tube to pick-up an image of said object in a subsequent position thereof and to produce a corresponding signal from which the signal then stored in the pick-up tube is subtracted for providing a resultant signal representing the changes in said subsequent position from said initial position, and simultaneously applying said resultant signal to said memory device for storage in the latter in superposed relation to the signal previously stored in the memory device; and

    repeating said second and third steps cyclically at intervals for the duration of said period of time so that, at the conclusion of said period of time, said memory device has stored therein a final composite video signal corresponding to said first signal with the successive resultant signals superposed thereon.

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