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Color imaging apparatus including a means for electronically non-linearly expanding and compressing dynamic range of an image signal

  • US 4,926,247 A
  • Filed: 10/14/1987
  • Issued: 05/15/1990
  • Est. Priority Date: 10/15/1986
  • Status: Expired due to Term
First Claim
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1. A logarithmic color imaging apparatus comprising:

  • an imaging device for converting a light image of an object to at least one electric output signal;

    a color separating means for separating each output signal of said imaging device into separate output signals for different primary colors or auxiliary colors;

    a first logarithmic compressing means for logarithmically compressing the output signals of said color separating means for the different primary colors or auxiliary colors;

    an inverse-logarithmic converting means for inverse-logrithmically converting output signals of said first logarithmic compressing means;

    a matrix-converting means for linear-matrix-converting output signals of said inverse-logarithmic converting means;

    a second logarithmic compressing means for logarithmically compressing output signals of said matrix-converting means; and

    a color signal compounding means for producing a logarithmically compressed brightness signal from output signals of said second logarithmic compressing means.

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