Experimental results

1, calibration

In order to determine the accuracy of the device, a three-dimensional point of the angular point of the column (radius 24 Em), height 180 cm) and the cylindrical face is designed. The calibration target of the coordinate value is shown in Figure 6. The height in the vertical direction of each color block on the cylinder is the same, and the arc length in the horizontal direction is different, so that the coordinate values of the respective angular points on the cylinder are nonlinear relationships, thus improving the accuracy of the calibration. At least 30 standard timing points are selected for the real camera and virtual cameras.

According to each set The camera is analyzed by the calculated value of the same calibration point in the empty question. For example: 2 cameras captured the same point P in the space on the calibration target. The three-dimensional coordinates obtained by the image conversion of the next camera and the other camera were recorded as P ', and p ".

The scanning system of this paper selects 31 identical calibration points, the average error of the calibration point is 2.03 mm, and the standard deviation is 0.86 mm.

2, the speed and accuracy of the laser light band center extraction

, (z, y.) Is a gradation value of the corresponding pixel point, (X ., Y. Coordinate for the center point of the foundable light.

The coordinates of the resulting optical belt center points are more accurate.

3, human scanningSelecting a female high 165 cm of the L position for scanning experiments. The scanner is standing in the real camera. The front surface data of the human body is taken directly from the real camera, and the 3L 286 data points are collected, and the standard error is 0.73 mm. The spacing of 2 adjacent points in the horizontal direction does not exceed 3.1 mm. The front data point cloud map of the human body is shown in Figure 7.

The left and right sides of the back surface of the human body is not directly taken directly, which is equivalent to the camera to take the target from the left and right sides of the plane. The resulting image pixel accuracy is lower than the front, and each side is probably obtaining the human surface 16 784 to 18 372 points. The standard error is 0.92 ~ 1.08 mm, and the spacing of adjacent two points in the horizontal direction is not. More than 3.9 mm. Figure 8 shows the backpoint cloud of the human body after the back of the left and right sides of the body. Table L shows the current main commercial three-dimensional body scanner consumption and accuracy. Compared with the current commercial three-dimensional scanning system, the scanning system of

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