Chapter 5
Performing Machine Vision Tasks
IMAQ Vision for LabWindows/CVI User Manual
5-10
ni.com
Finding Lines or Circles
If you want to find points along the edge of an object and find
a line describing the edge, use
imaqFindEdge()
and
imaqFindConcentricEdges()
. The
imaqFindEdge()
function finds
edges based on rectangular search areas, as shown in Figure 5-5. The
imaqFindConcentricEdge()
function finds edges based on annular
search areas.
Figure 5-5.
Finding a Straight Feature
1
Search Region
2
Search Lines
3
Detected Edge Points
4
Line Fit to Edge Points
2
1
4
3
