Homography
Find the homography (perspective transformation) between two planar point sets.
Syntax
Definition:
HRESULT Homography(
HRESULT hrPrev,
ITcVnContainer* ipSrcPoints,
ITcVnContainer* ipDestPoints,
TcVnMatrix3x3_LREAL& aPerspectiveTransform,
ETcVnEstimationAlgorithm eAlgorithm = EA_DEFAULT,
double fReprojThreshold = 3,
ITcVnContainer** pipInlierMask = nullptr,
ULONG nMaxIterations = 2000,
double fConfidence = 0.995
)Parameters
|
Name |
Type |
Default |
Description |
|---|---|---|---|
|
hrPrev |
|
HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.) | |
|
ipSrcPoints |
|
Container with at least 4 source points (ContainerType_Vector_TcVnPoint2_REAL) | |
|
ipDestPoints |
|
Container with destination points (same number as ipSrcPoints, ContainerType_Vector_TcVnPoint2_REAL) | |
|
aPerspectiveTransform |
|
Returns the perspective transformation matrix, which transforms the source points to the destination points | |
|
eAlgorithm |
EA_DEFAULT |
Estimation algorithm | |
|
fReprojThreshold |
double |
3 |
Maximum allowed reprojection error to treat a point pair as an inlier (only for RANSAC, RHO) |
|
pipInlierMask |
nullptr |
Returns a mask marking the inliers (optional, set to 0 if not required; ContainerType_Vector_SINT; only for RANSAC, LMEDS) | |
|
nMaxIterations |
ULONG |
2000 |
Maximum number of RANSAC iterations |
|
fConfidence |
double |
0.995 |
Confidence (0..1) |
Return valueRequired License
TC3 Vision Base
System Requirements
Development environment | Target platform | PLC libraries to include |
|---|---|---|
TwinCAT V3.1.4024.59 or later | PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU | Tc3_Vision |