Line Finder l Adaptive High Sensitivity detects a great amount of low-contrast edges and noise. l Fixed Value sets an absolute value for the sensitivity to contrast. A typical situation for the use of a fixed value is a setting in which there is little variance in lighting con- ditions. The value represents steps in grey-level. o Higher values reduce sensitivity to contrast. This reduces noise and the amount of low-contrast edges. o Lower values increase sensitivity and add a greater amount of edge at the expense of adding more noise. This may generate false detections and/or slow down the search process.
Maximum Angle Deviation Maximum Angle Deviation relates to the deviation in angle between a hypothesis and the line found by the tool. By default the Line Finder accepts a 20 degree deviation. However, the tool uses the defined Maximum Angle Deviation value to test the hypothesis and refine the pose of the found line. Positioning Level Positioning Level sets the effort level of the instance-positioning process. The range is from 10 (coarser positioning and lower execution time) to 100 (high-accuracy positioning of lines). Subsampling Level Subsampling Level sets the subsampling level used to detect edges that are used by the tool to generate hypotheses.
l High values provide a coarser search with a shorter execution time. l Lower values can provide a more refined search with slower execution time. l A higher subsampling value may help improve accuracy in blurry images. Results Logging If enabled, the results of the tool will be logged to a file. If the extension of the destination file is csv, then the log is written in csv format, which opens with Excel. If a different extension is selected, the log is written in a plain text format (similar to the ACE Sight 2 format). The size of the log file can be set (default size is 5 Mb). Related Topics Line Finder ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 554