Method of and apparatus for processing image data
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorFumihiro Hatayama
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Abstract
For image parts in an image with large circumscribed quadrilaterals, one-dimensional data development is executed where intersection point data on a scanning line are accumulated for plural image parts and one-dimensional raster data of the scanning line is produced based on the intersection point data. For image parts with small circumscribed quadrilaterals, two-dimensional data development is executed where intersection point data in an image part are obtained and two-dimensional raster data of the image part is produced. While the one-dimensional data development requires only a small memory capacity for raster data creation even for relatively large image parts, the two-dimensional data development allows high-speed raster data creation for relatively small image parts.
Claims20
An image data processing method for producing raster data of an image comprising a plurality of image parts, comprising the steps of:
- sequentially selecting one of said plurality of image parts;
- comparing the size of the selected one of said plurality of image parts with a predetermined reference size;
- and
- executing one-dimensional data processing for producing raster data representing a one-dimensional image portion of the selected one of said plurality of image parts when the selected one of said plurality of image parts is larger than said reference size, and executing two-dimensional data processing for producing raster data representing a two-dimensional image portion of the selected one of said plurality of image parts when the selected one of said plurality of image parts is smaller than said reference size.
An image data processing apparatus for producing raster data of an image comprising a plurality of image parts, comprising:
- first means for sequentially selecting one of said plurality of image parts;
- second means for comparing the size of the selected one of said plurality of image parts with a predetermined reference size;
- third means for executing one-dimensional data processing for producing raster data representing a one-dimensional image portion of the selected one of said plurality of image parts when the selected one of said plurality of image parts is larger than said reference size;
- and
- fourth means for executing two-dimensional data processing for producing raster data representing a two-dimensional image portion of the selected one of said plurality of image parts when the selected one of said plurality of image parts is smaller than said reference size.
An image data processing apparatus for producing raster data of an image including a plurality of image parts, comprising:
- first means for producing intersection point information representing an intersection point of each scanning line with a contour of an image region within a selected one of said plurality of image parts;
- a memory for storing said intersection point information;
- and
- second means for producing raster data from said intersection point infomration stored in said memory;
- wherein said first means comprises:
- means for sequentially selecting one of said plurality of image parts;
- means for comparing the size of the selected one of said plurality of image parts with a predetermined reference size;
- and
- means for producing said intersection point information as one-dimensional intersection point information when the selected one of said plurality of image parts is larger than said reference size and producing said intersection point information as two-dimensional intersection point information when the selected one of said plurality of image parts is smaller than said reference size, wherein said intersection point information includes filling-indication data indicating whether each intersection point of each scanning line with a contour of an image region within the selected one of said plurality of image parts is a start point or an end point of filling.
Dependencies are inferred from the claim text.