MeasureAngleBetweenEdges
Measure the angle between 2 edges.
Can use available TwinCAT Job Tasks for executing parallel code regions.
Can return partial results when canceled by Watchdog.
Syntax
Definition:
HRESULT MeasureAngleBetweenEdges(
HRESULT hrPrev,
ITcVnImage* ipSrcImage,
float& fAngle,
TcVnPoint2_REAL& aInnerPoint,
TcVnPoint2_REAL& aOuterPoint1,
TcVnPoint2_REAL& aOuterPoint2,
ETcVnEdgeDirection eEdgeDirection,
float fMinStrength,
ULONG nSearchLines,
float fSearchLineDist = 1,
ULONG nMaxThickness = 10,
bool bInvertSearchDirection = false,
ULONG nSubpixelsIterations = 10,
bool bAngleInDegrees = false,
float fApproxPrecision = 0.001f,
ETcVnEdgeDetectionAlgorithm eAlgorithm = EDA_INTERPOLATION,
ITcVnContainer** pipEdgePoints1 = nullptr,
ITcVnContainer** pipEdgePoints2 = nullptr,
float fRangeCutoffFactor = 0.135f
)Parameters
|
Name |
Type |
Default |
Description |
|---|---|---|---|
|
hrPrev |
|
HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.) | |
|
ipSrcImage |
|
Source image (1 channel) | |
|
fAngle |
float& |
|
Returns the angle between the detected edges (radians or degrees, depending on bAngleInDegrees) |
|
aInnerPoint |
|
Position inside the angle to measure, from which to start the edge search process (in the direction of aOuterPoint1 and aOuterPoint2) | |
|
aOuterPoint1 |
|
Position where the search process for edge 1 ends | |
|
aOuterPoint2 |
|
Position where the search process for edge 2 ends | |
|
eEdgeDirection |
|
Specification of the edge direction from aInnerPoint to aOuterPoint1 and aOuterPoint2 to search for | |
|
fMinStrength |
float |
|
Specification of the minimum strength (intensity difference) of the edge to search for |
|
nSearchLines |
ULONG |
|
Width of the search window, i.e. the number of search lines (3, 5, 7, ...), centered around the line specified by aInnerPoint and aOuterPoint1, aOuterPoint2 |
|
fSearchLineDist |
float |
1 |
Distance between the search lines in pixels (> 0) |
|
nMaxThickness |
ULONG |
10 |
Specification of the maximum thickness of the edge to search for, which means fMinStrength must be reached within nMaxThickness pixels |
|
bInvertSearchDirection |
bool |
false |
If true, the search starts from each aOuterPoint in direction of aInnerPoint |
|
nSubpixelsIterations |
ULONG |
10 |
Specifies the number of subpixels (for INTERPOLATION, 10 - 20 usually is sufficient) or maximum number of iterations for optimizing the parameters (for APPROX_ERF and APPROX_GAUSSIAN, 50 - 100 usually is sufficient) |
|
bAngleInDegrees |
bool |
false |
fAngle is in degrees, if true |
|
fApproxPrecision |
float |
0.001f |
Specifies the approximation precision for APPROX_ERF and APPROX_GAUSSIAN (0.001 usually is sufficient, unused for INTERPOLATION) |
|
eAlgorithm |
EDA_INTERPOLATION |
Selection of the edge detection algorithm | |
|
pipEdgePoints1 |
nullptr |
Returns the detected edge points between aInnerPoint and aOuterPoint1 (ContainerType_Vector_TcVnPoint2_REAL) | |
|
pipEdgePoints2 |
nullptr |
Returns the detected edge points between aInnerPoint and aOuterPoint2 (ContainerType_Vector_TcVnPoint2_REAL) | |
|
fRangeCutoffFactor |
float |
0.135f |
Relative edge strength factor to cut off the range of pixels used for approximation. Negative numbers are valid to include noise, i.e. intensity differences in the other direction. At most nMaxThickness pixels are used in each direction. |
Return valueRequired License
TC3 Vision Metrology 2D