Picture signal contrast control

  • US 7,050,114 B2
  • Filed: 04/08/2002
  • Issued: 05/23/2006
  • Est. Priority Date: 04/11/2001
  • Status: Active Grant
First Claim
Patent Images

1. A method of controlling contrast in a first part of a picture, said picture being represented by a picture signal, said picture signal comprising a number of sub signals each holding color information for different areas of the picture, said color information being represented by a first set of basic colors, each of said basic colors having an amplitude, the method comprising:

  • increasing (1) contrast by increasing the amplitudes of all basic colors in a selected sub signal representing that part of the picture to be contrast increased,determining (2–

    4) if an amplitude of one of said basic colors exceeds a predefined value, andreducing (2–

    4) saturation of said color information if an amplitude of one of said basic colors exceeds the predefined value.

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