Image processing system and assistance system

1. An assistance system, comprising:

an image processing system, comprising:

a mark in which at least a pair of fiducial lines set to regulation lengths are arranged in a parallel manner or at a predetermined angle so as to form a regulation angle, or four or more fiducial points not on the same straight line virtually configuring the pair of fiducial lines are arranged, and an information display portion presenting predetermined information is included in a region formed by the pair of fiducial lines;

a camera that is relatively movable with respect to the mark;

an information acquisition unit that acquires image data of the mark through image capturing performed by the camera and acquires the information presented in the information display portion of the mark, out of the image data;

a distance calculation unit that calculates a distance from the camera to the mark in an optical axis direction based on the regulation lengths of the pair of fiducial lines and apparent lengths of the pair of fiducial lines in the image data;

an angle calculation unit that calculates a tilt angle of the camera with respect to the mark based on the regulation angle of the pair of fiducial lines and an apparent angle formed by the pair of fiducial lines in the image data;

a mobile body that is provided with the camera and is movable with respect to the mark; and

a movement control unit that controls a movement of the mobile body,

wherein the information of the information display portion includes control information related to at least one of a movement path and a movement speed of the mobile body with respect to the mark,

wherein the movement control unit controls movement of the mobile body based on the control information acquired by the information acquisition unit,

wherein the mobile body configures an assistance apparatus which aids motion of an person receiving assistance, and

wherein the information of the information display portion includes at least one item of personal information which specifies the person receiving assistance and aid information which is related to the aid.

2. The assistance system according to claim 1 ,

wherein the distance calculation unit calculates a shift amount of the camera with respect to the mark based on a difference between a fiducial position of the mark deduced from the pair of fiducial lines in the image data, and a center position of the image data.

3. The assistance system according to claim 2 ,

wherein the information presented by the information display portion includes the regulation lengths and the regulation angle of the pair of fiducial lines,

wherein the distance calculation unit calculates the distance in the optical axis direction or the shift amount by using the regulation lengths acquired by the information acquisition unit, and

wherein the angle calculation unit calculates the tilt angle by using the regulation angle acquired by the information acquisition unit.

4. The assistance system according to claim 3 ,

wherein the information display portion of the mark is configured with a two-dimensional code in which a plurality of unit cells are arrayed in a matrix shape along the fiducial line.

5. The assistance system according to claim 4 ,

wherein in the mark, the pair of fiducial lines are arranged in a parallel manner and the plurality of unit cells are arrayed over a plurality of columns in an extending direction of the fiducial line.