CAD Contour Processing Morphological Operations Endpoint Accuracy
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Solution Overview
Problem
Existing contour line processing methods in CAD technology face challenges in accurately determining the endpoints of line segments that are close to each other, leading to misjudgments and difficulties in forming enclosed contours, which affects the estimation of area or weight of product objects and consumes excessive system resources.
Innovation Solution
A contour line processing method that involves obtaining a CAD image file, detecting line segments, performing morphological operations such as dilation and erosion to generate blocks, and determining a target contour block through a union operation, effectively converting discrete line segments into closed contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the endpoints of multiple line segments are determined by direct connection, then the process is simple, but misjudgment occurs when endpoints are too close, leading to gaps and inability to form enclosed contours
Solution Approach 1:
The patent introduces an intermediary approach by using morphological operations (dilation followed by erosion) as a mediator between the line segments and the final contour. This intermediary process expands the line segments to blocks, performs union operation to connect them, then erodes back to form the final contour, effectively resolving the endpoint proximity problem without requiring direct endpoint connection
Solution Approach 2:
The patent changes the parameter representation from point-based (endpoints) to region-based (blocks). By transforming line segments into blocks through dilation, then performing union operation, and finally eroding to get the contour, the method changes the fundamental parameter from discrete points to continuous regions, eliminating the misjudgment issue
2Reliability
If all line segments are analyzed to determine sequence relationship, then complete contour formation is achieved, but system resources are consumed excessively
Solution Approach 1:
The patent merges the processing of multiple line segments into a single unified operation. Instead of analyzing each line segment's sequence relationship individually, the method performs a union operation on all expanded blocks simultaneously, then extracts the contour from the result. This merging approach maintains completeness while dramatically reducing computational complexity
Solution Approach 2:
The patent performs preliminary action by first expanding all line segments into blocks through morphological operations before performing the union operation. This preliminary transformation simplifies the subsequent contour formation process, allowing the system to process all segments more efficiently rather than analyzing their sequence relationships in detail
Data Source
AI summary
A contour line processing method is provided, which includes obtaining a computer-aided design image file and detecting a plurality of line segments from the computer-aided design image file, performing a first morphological operation on the plurality of line segments to generate a plurality of blocks, performing a union operation on the plurality of blocks to generate a union block, performing a second morphological operation on the union block to generate a processed block, and determining a target contour block according to the processed block.