How to specify an elliptical region to be used in ROIToMask

I'd like to make an specified elliptical descrpitor for IMAQ ROIToMask, but I don't know how.

Ishi,
You can define an Oval for ROItoMask by creating your own ROI Descriptor. Below is the datastructure for an ROI Descriptor. I have provided a description of what needs to be in the ROI Descriptor to create an oval.
Array of Clusters
Array of I32 - Global Rectangle is the minimum rectangle required to contain all of the contours in the ROI.
Contours are each of the individual shapes that define the ROI, as follows:
ID refers to whether the contour is the external or internal edge of an ROI. If the contour is external, all of the area inside it is considered part of the ROI. This VI draws the contours in the order that they are listed in the ROI Descriptor.
Type is the shape type of the contour.
Coordinates is the coordinates that define the contour.
1. I32 Array Global Rectangle is the minimum rectangle required to contain all of the contours in the ROI.
2. Array of Clusters
So, basically you need to define a global rectangle

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