Touch detection apparatus, touch detection method and recording medium
First Claim
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1. A touch detection apparatus, comprising:
- a plurality of lighting units configured to emit light including invisible wavelength components onto a screen;
a control unit configured to control the emission of light from the plurality of lighting units according to a plurality of lighting patterns including;
a first lighting pattern to cause one or more of the plurality of lighting units associated with a first group to emit light such that a shadow of an object is formed at a first position on the screen; and
a second lighting pattern to cause one or more of the plurality of lighting units associated with a second group to emit light such that the shadow of the object is formed at a second position on the screen, the second position being different from the first position,wherein at least one of the plurality of lighting units associated with the second group is different from the plurality of lighting units associated with the first group;
an image sensing unit configured to obtain, according to control by the control unit, a plurality of captured images of the screen including;
a first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group; and
a second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group,wherein the image sensing unit is configured to have a sensitivity to the invisible wavelength components of the light emitted from the plurality of lighting units; and
a detection unit configured to detect a touch to the screen by the object based on the plurality of captured images including the first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group and the second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group.
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Abstract
A touch detection method executed by a touch detection apparatus projects light that does not include a wavelength component of visible light onto a screen, has a sensitivity in a wavelength component of the light projected by the projecting, takes an image on the screen in a state where light is projected by the projecting, and performs detection pertaining to a touch, based on image data taken by the image-sensing.
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Citations
10 Claims
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1. A touch detection apparatus, comprising:
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a plurality of lighting units configured to emit light including invisible wavelength components onto a screen; a control unit configured to control the emission of light from the plurality of lighting units according to a plurality of lighting patterns including; a first lighting pattern to cause one or more of the plurality of lighting units associated with a first group to emit light such that a shadow of an object is formed at a first position on the screen; and a second lighting pattern to cause one or more of the plurality of lighting units associated with a second group to emit light such that the shadow of the object is formed at a second position on the screen, the second position being different from the first position, wherein at least one of the plurality of lighting units associated with the second group is different from the plurality of lighting units associated with the first group; an image sensing unit configured to obtain, according to control by the control unit, a plurality of captured images of the screen including; a first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group; and a second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group, wherein the image sensing unit is configured to have a sensitivity to the invisible wavelength components of the light emitted from the plurality of lighting units; and a detection unit configured to detect a touch to the screen by the object based on the plurality of captured images including the first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group and the second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch detection method, comprising:
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instructing a plurality of lighting units to emit light including invisible wavelength components onto a screen; controlling the emission of light from the plurality of lighting units according to a plurality of lighting patterns including; a first lighting pattern to cause one or more of the plurality of lighting units associated with a first group to emit light such that a shadow of an object is formed at a first position on the screen; and a second lighting pattern to cause one or more of the plurality of lighting units associated with a second group to emit light such that the shadow of the object is formed at a second position on the screen, the second position being a position different from the first position, wherein at least one of the plurality of lighting units associated with the second group is different from the plurality of lighting units associated with the first group; image-sensing, according to control by the controlling, a plurality of captured images of the screen including; a first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group; and a second captured image of the screen, wherein the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group, the image-sensing further including sensing the invisible wavelength components of the light emitted from the plurality of lighting units; and detecting a touch to the screen by the object based on the plurality of captured images including the first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group and the second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group.
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10. A non-transitory computer-readable recording medium having recorded therein a program for causing a computer to execute:
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instructing a plurality of lighting units to emit light including invisible wavelength components onto a screen; controlling the emission of light from the plurality of lighting units according to a plurality of lighting patterns including; a first lighting pattern to cause one or more of the plurality of lighting units associated with a first group to emit light such that a shadow of an object is formed at a first position on the screen; and a second lighting pattern to cause one or more of the plurality of lighting units associated with a second group to emit light such that the shadow of the object is formed at a second position on the screen, the second position being a position different from the first position, wherein at least one of the plurality of lighting units associated with the second group is different from the plurality of lighting units associated with the first group; image-sensing, according to control by the controlling, a plurality of captured images of the screen including; a first captured image of the screen, where the shadow of the object is formed at the first position, being lighted by the one or more of the plurality of lighting units associated with the first group; and a second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group, the image-sensing further including sensing the invisible wavelength components of the light emitted from the plurality of lighting units; and detecting a touch to the screen by the object based on the plurality of captured images including the first captured image of the screen, where the shadow of the object is formed a the first position, being lighted by the one or more of the plurality of lighting units associated with the first group and the second captured image of the screen, where the shadow of the object is formed at the second position, being lighted by the one or more of the plurality of lighting units associated with the second group.
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Specification