Interactive input system with improved signal-to-noise ratio (SNR) and image capture method
First Claim
1. An input panel for an interactive input system comprising:
- an optical waveguide;
a first radiation source that is turned on and off, when on said first radiation source directing radiation into said optical waveguide, said radiation undergoing total internal reflection within said optical waveguide;
a diffusion layer adjacent to and disposed on one major outer side of the optical waveguide, totally internally reflected radiation within said optical waveguide being frustrated and escaping the optical waveguide in response to one or more pointer contacts on the diffusion layer;
at least one second radiation source that is turned on and off, when on said at least one second radiation source directing radiation towards an opposite major outer side of the optical waveguide; and
at least one imaging device having a field of view looking at the opposite major outer side of the optical waveguide and capturing image frames, wherein during image frame capture operation, image frames are captured at least when (i) the first radiation source is on and the at least one second radiation source is off (ii) the first radiation source is off and the at least one second radiation source is on and (iii) the first radiation source is off and the at least one second radiation source off.
7 Assignments
0 Petitions
Accused Products
Abstract
An input panel for an interactive input system comprises an optical waveguide; a first radiation source directing radiation into said optical waveguide, said radiation undergoing total internal reflection within said optical waveguide; a diffusion layer adjacent to and on one side of the optical waveguide, totally internally reflected light being frustrated and escaping the optical waveguide in response to pointer contacts on the diffusion layer; a second radiation source directing radiation towards another side of the optical waveguide that is opposite the one side; and at least one imaging device having a field of view looking at the optical waveguide and capturing image frames, wherein said first and second radiation sources are turned on and off in succession and wherein said first radiation source is turned off when said second radiation source is on and wherein said first radiation source is turned on when said second radiation source is off.
-
Citations
24 Claims
-
1. An input panel for an interactive input system comprising:
-
an optical waveguide; a first radiation source that is turned on and off, when on said first radiation source directing radiation into said optical waveguide, said radiation undergoing total internal reflection within said optical waveguide; a diffusion layer adjacent to and disposed on one major outer side of the optical waveguide, totally internally reflected radiation within said optical waveguide being frustrated and escaping the optical waveguide in response to one or more pointer contacts on the diffusion layer; at least one second radiation source that is turned on and off, when on said at least one second radiation source directing radiation towards an opposite major outer side of the optical waveguide; and at least one imaging device having a field of view looking at the opposite major outer side of the optical waveguide and capturing image frames, wherein during image frame capture operation, image frames are captured at least when (i) the first radiation source is on and the at least one second radiation source is off (ii) the first radiation source is off and the at least one second radiation source is on and (iii) the first radiation source is off and the at least one second radiation source off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An interactive input system comprising:
-
at least one Imaging device capturing image frames of a region of interest, wherein the exposure time for each captured image frame is less than a total image frame capture time; at least first and second radiation sources that are turned on and off, when on each of the at least first and second radiation sources emitting radiation into the region of interest during the exposure time; and processing structure processing images captured by said at least one imaging device to determine the presence of one or more pointers within the region of interest, wherein during image frame capture operation, image frames are captured at least when (i) the first radiation source is on and the second radiation source is off (ii) the first radiation source is off and the second radiation source is on and (iii) the first radiation source is off and the second radiation source off. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
-
Specification