Only features with keypoint.hessian larger than that are extracted. good default value is ~300-500 (can depend on the average local contrast and sharpness of the image). user can further filter out some features based on their hessian values and other characteristics

public double HessianThreshold { get; set; }

Public Property HessianThreshold As Double
	Get
	Set

public:
property double HessianThreshold {
	double get ();
	void set (double value);
}

member HessianThreshold : float with get, set