Dynamic contrast automatic adjustment circuit and adjustment method thereof

Dynamic contrast automatic adjustment circuit and adjustment method thereof

  • CN 102,572,341 A
  • Filed: 12/30/2010
  • Published: 07/11/2012
  • Est. Priority Date: 12/30/2010
  • Status: Active Application
First Claim
Patent Images

1. dynamic contrast automatic circuit comprises at least:

  • The statistics with histogram module, it makes up brightness histogram according to the luminance input signal that receives, and adds up brightness in this brightness histogram less than the number of the point of low threshold and the brightness number greater than the point of high threshold;

    The dynamic parameter computing module;

    According to each dynamic parameter of Linear Mapping curve calculation that this brightness provides greater than the number and the piecewise linear maps module of the point of high threshold less than the number of the point of low threshold, this brightness, this each dynamic parameter comprises that at least mapping selects the slope and the side-play amount of each section straight line in signal, this mapping curve;

    Dynamic brightness adjustment circuit;

    Receive this each dynamic parameter and this luminance input signal, be used for this luminance input signal being increased greater than the number of the point of high threshold less than the number of the point of low threshold and this brightness or reducing by a dynamic brightness shifted signal to be adjusted into luminance input signal to be mapped according to this brightness;

    AndThe piecewise linear maps module according to this each dynamic parameter that receives, should be calculated in luminance input signal pointwise to be mapped, with the luminance signal output after the acquisition mapping.

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