Method of measuring a displacement amount for an automobile suspension assembly

A method of measuring a displacement amount of a measurement point of a work surface from a reference position using a photographing device and a laser distance sensor, wherein the measurement point is different from the reference position, a reference plane is set at the reference position and parallel to the work surface, and a distance from the photographing device to the reference plane is set as a reference distance, the method comprising:

• measuring by the photographing device a first displacement amount of the measurement point in a first direction from a first intersection of a photographing direction vector and the reference plane to a second intersection of the reference plane and a vector from the photographing device to the measurement point;
• measuring by the laser distance sensor a second displacement amount of the measurement point in a second direction perpendicular to the reference plane from the reference plane to the work surface;
• and
• calculating a third displacement amount of the measurement point in a third direction within a plane of the work surface based on the first displacement amount measured by the photographing device, the second displacement amount measured by the laser distance sensor, and the reference distance.