Mobile terminal with image projection
AssigneeLG Electronics Inc.
InventorsDuck Moon Shin, Jong Hwan Kim
Life of this patent
Estimating the term…
Abstract
A mobile terminal is provided including a projector module, a camera, and a controller. The projector module is configured to project an image for display on an external screen. The camera is configured to receive an input image of the image displayed on the external screen. The input image includes a pointer located over the image and a shadow of the pointer. The controller is configured to obtain a distance between the pointer and the shadow of the pointer from the input image, to recognize a touch by the pointer to a touch point in the displayed image according to the obtained distance, to project through the projector module a pointer cursor at the touch point, and to perform an operation corresponding to the recognized touch point.
Claims22
A mobile terminal comprising:
- a projector module configured to project an image for display on an external screen;
- a camera configured to receive an input image of the image displayed on the external screen, the input image including a pointer located over the image and a shadow of the pointer;
- and
- a controller configured to:
- obtain a distance between the pointer and the shadow of the pointer from the input image;
- recognize a touch by the pointer to a touch point in the displayed image according to the obtained distance;
- project through the projector module a pointer cursor at the touch point;
- perform an operation corresponding to the recognized touch point;
- recognize the touch by the pointer when the obtained distance is less than a threshold distance even when the distance between the pointer and the shadow of the pointer is not zero, and to not recognize the touch when the obtained distance is greater than the threshold distance;
- and
- cause displaying of text on the external screen when the obtained distance is greater than the threshold distance and less than a second threshold distance, the text indicating that a touch will be recognized when the distance between the pointer and the shadow of the pointer is less than the threshold distance.
A method of recognizing a touch in a mobile terminal, the method comprising:
- projecting an image on an external screen;
- capturing the external screen to obtain an input image, the input image including a pointer located over the image and a shadow of the pointer;
- obtaining a distance between the pointer and the shadow from the input image;
- recognizing a touch by the pointer to a touch point in the displayed image according to the obtained distance;
- projecting a pointer cursor at the touch point;
- and
- performing an operation corresponding to the recognized touch point,
- wherein:
- the touch by the pointer is recognized when the obtained distance is less than a threshold distance even when the distance between the pointer and the shadow of the pointer is not zero and no touch is recognized when the obtained distance is greater than the threshold distance;
- and
- the method further comprises displaying text on the external screen when the obtained distance is greater than the threshold distance and less than a second threshold distance, the text indicating that a touch will be recognized when the distance between the pointer and the shadow of the pointer is less than the threshold distance.
Dependencies are inferred from the claim text.