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Abstract

A semi-automatic image tracing method for a graphics processing device adapted to implement tracing an image semi-automatically involves starting tracing the image upon designation for tracing, tracing the image points in accordance with trace conditions for the control data in a parameter table, and interrupting the tracing at every branch point of the trace path at which designation affecting continued tracing by the operator is required. When the tracing is interrupted, the image data in the neighborhood of the branch point is displayed on a display unit in an enlarged manner by a branch-point neighborhood display processing section. The operator makes a designation to continue the trace processing. A switch is operatively controlled at the branch point which is involved with the control of the trace path of the image, in accordance with a predetermined control data of the parameter table. This allows the branch-point neighborhood display processing unit to make an enlarged display of an area in the neighborhood of the branch point on an auxiliary view port disposed separately from a main view port.

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First Claim