Generating, storing, and displaying graphics using sub-pixel bitmaps
First Claim
Patent Images
1. A method for generating a sub-pixel bitmap in a tile-based digital mapping system, comprising:
- assigning a unique color for each source in a map to be created at a desired resolution;
drawing a bitmap of the map at a higher resolution than the desired resolution, wherein each sub-pixel bitmap pixel corresponds to an N×
M pixel area in the higher resolution drawing;
for each of the N×
M pixel areas in the higher resolution drawing, counting the number of pixels associated with each source;
for each sub-pixel bitmap pixel, storing related source information and any corresponding weights, wherein a weight is used to indicate impact of a source on a sub-bitmap pixel; and
representing the sub-pixel bitmap pixels using run-length encoding that indicates alternating sequences of single source pixels and mixed source pixels included in the higher resolution drawing.
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Abstract
Techniques for generating, storing and displaying graphics on computer systems are disclosed. The type of graphics in particular are images, where the image can be defined as a set of areas, whether these areas are lines, geometric shapes, letters or other types of areas. The effect of using these methods is that graphics, such as digital maps, can be handled faster, with more flexibility and with higher display quality, both for screen use and for printing.
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Citations
23 Claims
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1. A method for generating a sub-pixel bitmap in a tile-based digital mapping system, comprising:
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assigning a unique color for each source in a map to be created at a desired resolution; drawing a bitmap of the map at a higher resolution than the desired resolution, wherein each sub-pixel bitmap pixel corresponds to an N×
M pixel area in the higher resolution drawing;for each of the N×
M pixel areas in the higher resolution drawing, counting the number of pixels associated with each source;for each sub-pixel bitmap pixel, storing related source information and any corresponding weights, wherein a weight is used to indicate impact of a source on a sub-bitmap pixel; and representing the sub-pixel bitmap pixels using run-length encoding that indicates alternating sequences of single source pixels and mixed source pixels included in the higher resolution drawing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for generating a sub-pixel bitmap, comprising:
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assigning a unique color for each source in a graphic to be created at a desired resolution; drawing a bitmap of the graphic at a higher resolution than the desired resolution, wherein each sub-pixel bitmap pixel corresponds to an N×
M pixel area in the higher resolution drawing;for each of the N×
M pixel areas in the higher resolution drawing, counting the number of pixels associated with each source;for each sub-pixel bitmap pixel, storing related source information and any corresponding weights, wherein a weight is used to indicate impact of a source on a sub-bitmap pixel; and representing the sub-pixel bitmap pixels using run-length encoding that indicates alternating sequences of single source pixels and mixed source pixels included in the higher resolution drawing. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification