Method to acquire human body safety envelopes

The invention discloses a method to acquire human body safety envelopes, comprising the steps of using the width direction of a bed body as an x axis, the length direction of the bed body as a y axisand the height direction of the bed body as a z axis to establish an xyz right-angled coordinate system; making a high slope shot for a human body lying flat on the bed body through a first camera from above, and screening high-slope outlines DP of the human body to obtain X coordinates and Y coordinates of human body outlines HP; calculating a human body center line L1 according to an average oftwo values x1 corresponding to each y1 in the high-slope outline; photographing a lateral projection of the human body, formed on a background board, through a second camera in a horizontal directionperpendicular to the human body center line L1, and screening to obtain human body side outlines SP; acquiring Z coordinates of the human body outlines HP according to z2 and the human body center line L1 so as to obtain the hu