By Thomas C. Henderson
This publication covers up to date equipment and algorithms for the automatic research of engineering drawings and electronic cartographic maps. The Non-Deterministic Agent procedure (NDAS) bargains a parallel computational method of such photo research. The publication describes innovations appropriate for chronic and specific wisdom illustration for engineering drawings and electronic maps. It additionally highlights extra particular ideas, e.g., employing robotic navigation and mapping tips on how to this challenge. additionally incorporated are extra unique bills of using unsupervised segmentation algorithms to map pictures. ultimately, most of these threads are woven jointly in similar platforms: NDAS and AMAM (Automatic Map research Module).
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Extra info for Analysis of Engineering Drawings and Raster Map Images
3. corner points: two directions of travel possible, but at significantly different angles. 4. multibranch points: more than two directions of travel possible. Methods were developed to identify these four types of point features, and a decision tree method was used to classify pixels. , one of the four possible types). An information theoretic approach was used to inform the construction of the decision tree (see ). Attributes used in building the decision tree included: • Attributes 1:7: Hu invariant moments  of the PRM.
Bounding box: the corners of the smallest bounding sub-image in the original image. • PCA frame: the PCA frame is found for each set of foreground pixels. • CC skeleton: this should be a medial axis like set of pixels. • branch points: points in the skeleton where three paths diverge. • endpoints: extreme points on a segment of the skeleton. , regular is neither end nor branch point); a segment is then either (1) a linear sequence of skeleton points with a branch or endpoint at each end and regular points in between or (2) a cycle consisting of only regular points.
52) text in box3: enforces distinct instance of text in box. (53) text in box4: enforces distinct instance of text in box. (54) one datum ref : 3 collinear and adjacent text in box. (55) two datum ref : 4 collinear and adjacent text in box. (56) datum ref : either of (54) or (55). (57) datum below text: a datum ref below text. 52 4 A Structural Model for Engineering Drawings • (58) dashed lines: 3 collinear line segments specifying a cross-section in the image. • (59) dash line1: enforces distinct instance of dashed line.