How to using ROI Region to Image Threshold (by NI Vision)?

[yflin]

I use C# and NI Vision development 2010 sp1,

I want to set ROI Region to Image Threshold

ex:

But,Thresold function must use VisionImag to Computing, as below parameter1 & parameter2...

public static  void Threshold(
   VisionImage source,
   VisionImage destination,
   Range range,
   bool replaceValue,
   double newValue
);

Now I just can Extract a new VisionImage to Threshold, and ImageToImage the new VisionImage to Origin VisionImage,

but it just can use a retangle to Extract Image,

How can I to use RotatedRectangle, Oval or Polygon ROI to achieve my function??

[Ting1224]

Hi,

Did you try to use Vision Assistant first before you try going deep into the C# code?

Vision Assistant helps you to prototype the application and it is easier to use.

[yflin]

Excuse me, I already have to try Vision Assistant,
but the threshold function of Vision Assistant only set gray level or autothreshold choice,
I can't set roi region to threshold.

I look for the help document, as below...
public static  void Threshold(
   VisionImage source,
   VisionImage destination,
   Range range,
   bool replaceValue,
   double newValue
);

public static Collection<ThresholdData> AutoThreshold(
   VisionImage source,
   VisionImage destination,
   int numberOfClasses,
   ThresholdMethod method,
   VisionImage mask
);

AutoThreshold function seem to use mask to achieve ROI region to threshold,
but I want to use manual threshold function that must use threshold function,
why threshold function have not mask parameter???

[Ting1224 · Accepted solution]

Hi yflin,

I think this is what you want to do in the Vision Assistant.

You can check my attched script and image.

[yflin]

That's right.

It is my demand.

Thanks for your repply.