Region

Support

Required licenses

EasyImage

Recommended images

Any

Location

[…]C:\Users\Public\Documents\Euresys\Open eVision 24.02\Sample Programs
\[LANGUAGE] samples\Image Processing\Region

Purpose

This sample program demonstrates how to:

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Create an ERegion and use it to restrict Open eVision processing to its domain.

Code highlights

Create an ERegion with the desired geometrical shape.

_region = new EPolygonRegion(...);
_region = new ERectangleRegion(...);
_region = new ECircleRegion(...);
_region = new EEllipseRegion(...);

Retrieve the handle at the given coordinates so you can later move it to new coordinates and modify the ERegion.

handle = _region.HitTest(x, y);

Move the previously retrieved handle to a new position to modify the ERegion.

_region.Drag(handle, x, y);

Draw the ERegion components, respectively the area, the contour and the handles (for graphical manipulation purposes).

_region->Draw(render_hdc);
_region->DrawContour(render_hdc);
_region->DrawHandles(render_hdc);

Compute the pixel average on the image, restricted to the domain of the ERegion.

EasyImage::PixelAverage(&_image, *_region, average);