发明授权
US4388620A Method and apparatus for generating elliptical images on a raster-type video display 失效
在光栅型视频显示器上产生椭圆图像的方法和装置

  • 专利标题: Method and apparatus for generating elliptical images on a raster-type video display
  • 专利标题(中): 在光栅型视频显示器上产生椭圆图像的方法和装置
  • 申请号: US222480
    申请日: 1981-01-05
  • 公开(公告)号: US4388620A
    公开(公告)日: 1983-06-14
  • 发明人: David L. Sherman
  • 申请人: David L. Sherman
  • 申请人地址: CA Sunnyvale
  • 专利权人: Atari, Inc.
  • 当前专利权人: Atari, Inc.
  • 当前专利权人地址: CA Sunnyvale
  • 主分类号: G09G5/02
  • IPC分类号: G09G5/02 G09G5/42 H04N5/262 G06F3/14
Method and apparatus for generating elliptical images on a raster-type
video display
摘要:
A method and apparatus provides for the generation of a number of elliptical images on a raster scan video display screen by storing information indicative of a predetermined model image, and for each elliptical image to be displayed, storing data indicative of the vertical and horizontal eccentricity of each image, and its display location. During display time, the vertical eccentricity, horizontal eccentricity, and display location binary information for each elliptical is accessed and used to sequentially read selected portions of the model image information to produce therefrom address signals indicative of the location of individual horizontal display elements that make up the desired elliptical image. The address signals are applied to a random access memory to store marker information indicative of the elliptical image at memory locations corresponding to the position on the display screen that the image will take. The random access memory is sequentially scanned in synchronism with the scan of the electron beam used to form the raster, converted to video information and displayed.
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