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Method of controlling transmission light amount and television camera apparatus using the method

  • US 6,674,474 B2
  • Filed: 10/19/2001
  • Issued: 01/06/2004
  • Est. Priority Date: 10/23/2000
  • Status: Expired due to Fees
First Claim
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1. A television camera apparatus for converting an incident light originated from a photographing object into a picture signal, comprising:

  • an image pick-up unit containing a plurality of photoelectric converting elements, for generating said picture signal;

    a detection unit for detecting first and second luminance level ranges each higher than a predetermined level within said picture signal at first and second predetermined time instants, respectively, and detecting a change component between said first and second luminance level ranges;

    a transmission light amount control unit for controlling a light amount of said incident light from said photographing object, received on the respective photoelectric converting elements;

    a predicting unit for predicting, at a preselected time instant before a third predetermined time instant, a third luminance level range at said third predetermined time instance higher than the predetermined level from said picture signal based on said change component from said detection unit; and

    a control unit coupled with said transmission light amount control unit, for controlling a light amount of said incident light entered into said photoelectric converting elements at said third predetermined time instant, based upon an output of said predicting unit.

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