Apparatus and method for real time reconstruction of digital map data
First Claim
Patent Images
1. Apparatus for real time reconstruction of digital map data, characterized by:
- bulk storage means for storing in compressed form symbology commands representing the total area covered by a map;
controlling means;
working memory means connected to the controlling means;
a symbol generator connected to the bulk storage means, the controlling means and the working memory means, and controlled by the controlling means for timely receiving the symbology commands from the bulk storage means and for thereupon drawing a desired digital picture of the map into the working memory means, whereby the working memory means contains digital data in uncompressed form corresponding to the desired digital map picture;
display memory means connected to the working memory means;
the working memory means being divided into a plurality of memory components, each of which is equivalent to a local map display area, said controlling means automatically updating an adjacent memory component wherever the passing of the boundary between two consecutive memory components is detected by said controlling means, whereby the apparatus functions transient free in real time, and said divided working memory means controlled by the controlling means for transferring the desired digital map picture to the display memory means which provides digital signals corresponding to said map picture; and
means connected to the display memory means and to the controlling means and controlled by the controlling means for converting the digital signals to video signals which are used for providing a desired map picture display.
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Abstract
Apparatus and method for real time reconstruction of digital map data are disclosed, wherein symbology commands representing the total area covered by a map are stored in bulk in compressed form. A symbol generator draws the symbology commands into a working memory device having a plurality of memory components, each of which is equivalent to a local display area. The memory components are received by a display memory device which contains an element by element digital representation of a map picture for conversion into video signals for driving a display device to display the map picture.
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Citations
12 Claims
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1. Apparatus for real time reconstruction of digital map data, characterized by:
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bulk storage means for storing in compressed form symbology commands representing the total area covered by a map; controlling means; working memory means connected to the controlling means; a symbol generator connected to the bulk storage means, the controlling means and the working memory means, and controlled by the controlling means for timely receiving the symbology commands from the bulk storage means and for thereupon drawing a desired digital picture of the map into the working memory means, whereby the working memory means contains digital data in uncompressed form corresponding to the desired digital map picture; display memory means connected to the working memory means; the working memory means being divided into a plurality of memory components, each of which is equivalent to a local map display area, said controlling means automatically updating an adjacent memory component wherever the passing of the boundary between two consecutive memory components is detected by said controlling means, whereby the apparatus functions transient free in real time, and said divided working memory means controlled by the controlling means for transferring the desired digital map picture to the display memory means which provides digital signals corresponding to said map picture; and means connected to the display memory means and to the controlling means and controlled by the controlling means for converting the digital signals to video signals which are used for providing a desired map picture display. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for real time reconstruction of digital map data, characterized by:
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storing in compressed form symbology commands representing the total area covered by a map; timely receiving the symbology commands for drawing a desired digital picture of the map, and providing digital data in uncompressed form corresponding to the desired map picture; transferring the desired digital map picture to a display memory means for providing corresponding digital signals, including dividing a working memory means into a plurality of memory components, each of which is equivalent to a local map display area, automatically updating an adjacent memory component wherever the passing of the boundary between two consecutive memory components is detected for reconstructing the digital map data transient free in real time, and controlling said divided working memory means for transferring the digital map picture to the display memory means; converting the digital signals to video signals; and using the video signals for providing a desired map picture display. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification