### Circles to XY

**Block Category:** Operations

Input Image
Format

**Input Image Requirements:** None

**Description:** The Circles to XY block converts
circles to *x,y* coordinates based on the center of the circle and ignores
all conversions that fall within a specified region.

**Ignore Rectangular Region: **Indicates the region to
be ignored.** **Top left is *x*_{1}, y_{1}; bottom right
is *x*_{2},y_{2}.

#### Example

In this example, a moving hockey punk is plotted in two XY
plots. The Resize, In Range, Erode Find Contour, Image Moment, and Draw Circles
blocks are used to detect, isolate, and highlight the punk as the player pushes
in across the table. The two Circles to XY blocks plot the course of the punk as
it moves across the table. **Flip Y** flips the *y* coordinate so that
the plot and the image mirror each other. (Note that in OpenVision, the *y*
coordinate starts at the top left corner of the image.) The upper plot defines
the region of the image to be ignored as 0,0 and 19,70. In the lower plot, the
image region to be ignored is larger and defined as 0,0 and 500,300.