Fall Detection and Direction Judgment Based on Posture Estimation

Algorithm 2

Fall direction judgment.

	Input: The 2D joint features obtained by the fall detection module;
	Output: Specific direction of fall;
(1)	If fall detection (P) = = “fall”:
(2)	Building 3D coordinate system: {
(3)	The generator maps 2D feature p to 3D; Feature X;
(4)	The discriminator judges the generated 3D feature X;
(5)	The re-projection module calculates the deviation of the estimation result;
	}
(6)	Select a group of joint points from X to form vector set L
(7)	Calculate the included angle θ of the same vector before and after the fall;
(8)	Determine the orientation of human body according to the position relationship of joint points;
(9)	Calculate the changes of X and Z coordinates of head joint points;
(10)	Estimate the specific direction of the fall;
(11)	Next frame;
(12)	End if