Abstract: A positioning and calibration method is applied in the positioning and calibration of a projection system with touch control function. The projection system includes a touch device and a projection device. The touch device has touch plates, which can be combined and formed into a plane. The projection device has projection units, which project images onto projection areas of the plane, respectively, so as to form a projection image on the plane. The positioning and calibration method includes the steps of projecting positioning markers onto the plane by the projection device; disposing a calibration element at or around each of the positioning markers; and locating and calibrating the corresponding projection unit according to a positioning signal of the calibration element delivered by the touch device. The invention makes the projection system, having touch plates, projection units and the touch control function, have the good location function.

Abstract: A projection system with touch control includes a touch device, a projection device and a control module. The touch device has plural touch plates which can be combined to form a plane. The projection device has plural projection units which can project on the plane respectively so as to form a projection image on the plane. The control module is electrically connected with the touch plates and the projection units for controlling the projection device to change the projection image corresponsively as a user touches the projection image projected on the plane. Herein, the touch plates can be combined to form a plane, and the user can interact with the projection image projected on the plane.