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Computer-generated image system to display translucent features with anti-aliasing

  • US 4,679,040 A
  • Filed: 04/30/1984
  • Issued: 07/07/1987
  • Est. Priority Date: 04/30/1984
  • Status: Expired due to Term
First Claim
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1. In a computer image generator having geometric processor means to prioritize faces of images to be displayed and for providing predetermined intensity information for said faces, having at least one video processor means including memory means to store temporarily information on each point to be displayed, and having display means to produce a visual representation of said images to be displayed, said video processor means comprising:

  • integrator circuit means connected to receive information from said geometric processor means on the priority and the intensity assigned to each face of images to be displayed;

    skip-over logic circuit means connected to receive information from said integrator circuit means to identify any areas in the faces of images to be displayed not requiring further intensity modification, and separating such identified areas for temporary storage;

    translucency update circuit means connected to receive information from said skip-over logic circuit means to identify those areas requiring further intensity modification in accordance with an assigned priority, the translucency update circuit means including;

    means to separate each area that requires further intensity modification into its own path and for modifying the intensity of each area that is separated in accordance with the relationship;

    ##EQU3## where;

    AT=Average Translucency,A=Area inside brackets,N=current face data value,P=previous face data value,&

    =the logical AND,TM=Translucency value,P=complement of P,N=complement of N;

    means to recombine the informationn from each path after intensity modification to form a combined signal according to the relationship;

    
    
    space="preserve" listing-type="equation">F=A[N&

    P]×

    TM×

    Q+A[N&

    P]×

    TM×

    Q where;

    F=the Resulting Intensity,A=a fractional area,N=the current intensity,P=the previous intensity,TM=data stored in memory,&

    =a logical AND value,Q=the opacity data value,P=the complement of P;

    andcircuit means to connect said combined signal from said translucency update circuit means to said display means.

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