ofVec2f ofxCvOpticalFlowLK::flowInRegion(ofRectangle roi)
{
	return flowInRegion(roi.x, roi.y, roi.width, roi.height);
}
ofPoint ofxCvOpticalFlowLK::flowInRegion(ofRectangle roi)
{
	return flowInRegion(roi.x, roi.y, roi.height, roi.width);
}