Machine Vision
IMAQ Vision Info VIs have misleading and undocumented parameters
Environment:
Windows 8.1
LabVIEW 2018 SP1 f4
Vision Development Module 2018-2019 SP1
Steps to Reproduce:
- Create a new VI (or see attached);
- Read an image and learn some Pyramid pattern matching template on it using IMAQ Learn Pattern 6 VI;
- Place an IMAQ Is Vision Info Present 2 VI on a BD and wire the template image to it;
- Create a constant for Vision Info terminal and select Grayscale Template item;
- Create an indicator for Present? terminal;
- Run the VI.
Expected Result:
According to VI reference:
Grayscale Template (3): Checks if any grayscale pattern matching template information is associated with the image.
So it's expected that Present? will return True.
Actual Result:
Present? returns False.
However, it returns True for Low Discrepancy Sampling template (only):
and Vision Info typedef contains more values than VI reference.
So it looks like Grayscale Template actually mean LD Sampling Template.
The same problems exist for IMAQ Remove Vision Info 2 VI.
Conclusion:
Vision Info Type2 typedef items and documentation need clarifications and updating.
Reported to NI with SR #7810065.
