| Parameter | Description |
|---|---|
| image | Destination image |
| center | Center of the circle |
| radius | Radius of the circle |
| color | Circle color in B:G:R orientation, e.g. for blue: IEVisionScalar(255, 0, 0) |
| thickness | Line width |
| linetype | Line type |
| shift | Thickness of lines that make up the rectangle. Negative values mean that the function has to draw a filled circle |