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Method and apparatus for constructing, storing and displaying characters
| Details |
Inventors: Daly, Joseph P.; Hennessy, Denis G.; Samways, Philip;
Assignee: nHance Development Corporation (Dublin, GB5)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner: Couso; Jose L.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett and Dunner
A method and apparatus for creating and storing characters for display on a video screen. The shape of the graphic character is displayed at various degrees of resolution. The graphic character is stored as a bitmap or as coefficients of spline curves. These can be scaled up or down to give different character sizes. The coefficients can be converted to form pixelmaps which are rectangular arrays of pixels. The pixelmaps may have gray scale values. |
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DETAILED DESCRIPTION This invention provides a computer system for creating graphic characters for display on a video screen, comprising: display means for displaying a graphic character at a plurality of different degrees of resolution; means for determining the shape of the displayed graphic characters for said displayed degrees of resolution by changing pixels forming the graphic character displayed for the higher of said plurality of degrees of resolution; and storage means for storing the graphic character for the higher resolution.
The invention further provides a method of operating a computer system for creating graphic characters for display on a video screen, comprising the steps of: displaying a graphic character at a plurality of different degrees of resolution; determining the shape of the displayed graphic character by changing pixels forming the graphic character displayed for the higher of said plurality of degrees of resolution; and storing the graphic character for the higher resolution.
In this latter method the displayed graphic character has three degrees of resolution, high, medium, and low, such that the graphic character corresponding to the medium resolution has approximately one-fourth of the pixels of the graphic character corresponding to the high resolution, and the graphic character corresponding to the low resolution has approximately one-fourth of the pixels of the graphic character corresponding to the medium resolution.
Additionally the invention provides a computer system for displaying graphic characters on a video screen, comprising: storage means for storing graphic characters as coefficients for spline curves which are a function of the boundaries of the respective graphic characters; conversion means for converting said coefficients to form a pixelmap of the character, said pixelmap including gray scale values from full on to full off for pixels at points along the boundary of the displayed graphic character; and display means for displaying said formed pixelmap
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TV Signal 
