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Picture processing apparatus

  • US 5,101,440 A
  • Filed: 09/08/1989
  • Issued: 03/31/1992
  • Est. Priority Date: 09/08/1988
  • Status: Expired due to Fees
First Claim
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1. A picture processing apparatus for transforming an input picture into a line picture, the apparatus comprising:

  • a) edge detection means receiving input picture data representing said input picture and detecting edges of an image included in said input picture and edge detection data corresponding thereto,b) converting means receiving said edge detection data from said edge detection means, said edge detection data representing said edges of the image, said converting means separately converting sad edge detection data by a transformation calculated from an entire histogram, derived from the whole image, of the frequency of said edge detection data versus the intensity of said edge detection data at the output thereof, said transformation causing as flatter intensity distribution of said edge detection data than at the input thereof, andc) means for displaying a line picture on the basis of converted edge detection data from said converting means wherein said detected edges are displayed with nearly equal visual intensity corresponding to the flatter histogram.

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