Interactive projection apparatus and touch position determining method thereof
AssigneeCoretronic Corporation
InventorsCheng-Shen Lee, Lien-Fu Cheng, Chih-Neng Tseng
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Abstract
An interactive projection apparatus and a touch position determining method thereof are provided. The invention adopts such a scheme of defining the effective touch area according to the coordinate information of the positioning pattern and judging whether or not the light spot is located in the effective touch area. If the light spot is located in the effective touch area, the position of the light spot is taken as the touch position of an input tool.
Claims13
An interactive projection apparatus, comprising a projection unit, a photosensitive unit and a control unit, wherein the projection unit projects a positioning beam onto a surface to form a positioning pattern, the photosensitive unit has a sensing area, the photosensitive unit senses the positioning pattern in the sensing area, and the control unit is coupled to the projection unit and the photosensitive unit, calculates a coordinate information of the positioning pattern and defines an effective touch area according to the coordinate information of the positioning pattern, wherein when the photosensitive unit senses a light spot in the sensing area, the control unit decides whether or not the light spot is located in the effective touch area, when the light spot is located in the effective touch area, a position of the light spot serves as a touch position of an input tool;
- when the light spot is not located in the effective touch area, the control unit does not respond to the light spot to perform any operation, wherein the effective touch area is capable of operating after a size of the rectangular effective touch area is adjusted according to a stray light produced by an ambient light in the sensing area, wherein the positioning pattern includes four dots defining a substantial rectangle and a fifth dot indicating the direction of a frame projected by the projection unit so as to avoid upside down of the projection frame.
A touch position determining method of an interactive projection apparatus, comprising:
- projecting a positioning beam onto a surface and forming a positioning pattern at the surface;
- sensing the positioning pattern in a sensing area;
- calculating coordinate information of the positioning pattern;
- defining an effective touch area according to the coordinate information of the positioning pattern;
- sensing a light spot in the sensing area;
- judging whether or not the light spot is located in the effective touch area;
- when the light spot is located in the effective touch area, taking a position of the light spot as a touch position of an input tool;
- and
- when the light spot is not located in the effective touch area, no operation is performed in response to the light spot that is not located in the effective touch area,
- wherein the effective touch area is capable of operating after a size of the rectangular effective touch area is adjusted according to a stray light produced by an ambient light in the sensing area, wherein the positioning pattern includes four dots defining a substantial rectangle and a fifth dot indicating the direction of a frame projected by the projection unit so as to avoid upside down of the projection frame.
Dependencies are inferred from the claim text.