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Image processor for processing source pixel intensity values

  • US 5,170,443 A
  • Filed: 12/11/1990
  • Issued: 12/08/1992
  • Est. Priority Date: 03/07/1990
  • Status: Expired due to Fees
First Claim
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1. An image processor for processing pixel data defining the intensity values of respective pixels of a source image, said image processor comprising image processing logic for modifying source pixel data for display on output means capable of displaying pixel intensity values between a minimum value (Imin) and a maximum value (Imax), the image processing logic comprising:

  • means for applying a linear mapping of source pixel intensity values (Is) ranging between said minimum value (Imin) and a predetermined threshold value (T) intermediate said minimum and maximum values to give output pixel intensity values (Io) in a range between the minimum value (Imin) and the threshold value (T); and

    means for applying a non-linear mapping of source pixel intensity values (IS) ranging between said threshold value (T) and an upper limit greater than said maximum value (Imax) to give output pixel intensity values (Io) in a range between the threshold value (T) and the maximum value (Imax), said non-linear mapping having a decreasing slope that approaches zero as said source pixel intensity value increases beyond said threshold.

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