Method for the detection of line width of line image in image processor
First Claim
1. In a line image processing method for tracing a line image on the basis of a tracing rule defined in terms of a parameter of the line image, the improvement comprising the steps of:
- designating a point near the line image to be traced as a start point;
retrieving a first beginning point on a first contour edge of the line image from the start point;
retrieving a first ending point on a second contour edge of the line image from the first beginning point;
detecting the number of pixels in a first continuous pixel line arranged in the line-width direction of the line image from the first beginning point to the first ending point as the line width of the line image; and
tracing the line image according to a tracing rule that is defined using the detected line width as a parameter of the tracing rule.
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Accused Products
Abstract
An image processor for performing trace processing for tracing the line image has an image memory for storing image data, a data memory for storing graphic data, a display unit for displaying the image data and the graphic data, an input unit for entering trace designation, a semi-automatic image trace processing section for performing the trace processing for tracing the line image of the image data in a semi-automatic way, and a tracing-rule description processing section for designating a trace method for tracing the line image. The line width of the line image is detected by designating a point in the vicinity of a pixel line as a start point for detecting the line width of the line image as an object of tracing the image data, retrieving a change point for changing pixels on a contour of the line image from the start point, and detecting the line width by detecting the number of the pixels in a continuous pixel line arranged in the line-width direction of the line image from the change point.
26 Citations
13 Claims
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1. In a line image processing method for tracing a line image on the basis of a tracing rule defined in terms of a parameter of the line image, the improvement comprising the steps of:
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designating a point near the line image to be traced as a start point; retrieving a first beginning point on a first contour edge of the line image from the start point; retrieving a first ending point on a second contour edge of the line image from the first beginning point; detecting the number of pixels in a first continuous pixel line arranged in the line-width direction of the line image from the first beginning point to the first ending point as the line width of the line image; and tracing the line image according to a tracing rule that is defined using the detected line width as a parameter of the tracing rule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a semi-automatic line image tracing method for tracing a line image on the basis of a tracing rule defined in terms of a parameter of the line image, the improvement comprising the steps of:
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manually designating a non-image point within a predetermined scanning range of a line image to be traced; deriving a first line width-determining point on the line image from the non-image point; deriving a second line width-determining point of the line image from the first line width-determining point, said first and second line width-determining points being respectively located on first and second opposed contour edges of the line image to be traced; determining the line width of the line image between the first and second line width-determining points; and tracing the line image according to a tracing rule that is defined using the line width determined by the determining step as a parameter of the tracing rule; wherein all steps but the designating step are performed automatically. - View Dependent Claims (11, 12)
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13. In a semi-automatic image trace processing method for tracing a line image on the basis of a tracing rule defined in terms of a parameter of the line image, the improvement comprising the steps of:
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manually designating a non-image point within a predetermined scanning range of a line image to be traced; deriving a first line width-determining point on the line image from the non-image point; deriving a second line width-determining point of the line image from the first line width-determining point, said first and second line width-determining points being respectively located on first and second opposed contour edges of the line image to be traced; determining the line width of the line image between the first and second line width-determining points; deriving a first plurality of line width-determining points on the first contour edge, in addition to the first line width-determining point, and a second plurality of line width-determining points on the second contour edge, in addition to the second line width-determining point, the second plurality of line width-determining points having a one-to-one correspondence with the first plurality of line width-determining points; determining respective line widths of the line image between the corresponding first and second pluralities of line width-determining points; determining the average of all determined line widths; and tracing the line image according to a tracing rule defined using the average line width as a parameter of the tracing rule; wherein all steps but the designating step are performed automatically.
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Specification