×

Processing method for the rotation of an image

  • US 4,618,991 A
  • Filed: 05/23/1984
  • Issued: 10/21/1986
  • Est. Priority Date: 05/23/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. An image rotation processing method for transforming the address signals identifying the storage locations in memory where there are stored signals of an original image represented in two-dimensional orthogonal coordinates into the address signals of memory locations for storing signals of an image rotated by an angle θ

  • (radians) with respect to said original image, comprising;

    a first step of transforming the address signals of the memory storage locations of said original image into address signals of memory storage locations which are represented on skew coordinates making an intersectional angle θ

    (radians) with respect to one of said orthogonal coordinates;

    a second step of conducting reduction of the transformed address signals substantially of cos θ

    in the direction of one axis of said orthogonal coordinates and enlargement substantially of sec θ

    (or cosec θ

    ) in the direction of the other axis; and

    a third step of transforming the reduced/enlarged address signals into address signals of memory storage locations which are represented on skew coordinates making an intersectional angle θ

    (radians) with respect to the other one of said orthogonal coordinates.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×