POSITION DETECTION SYSTEM AND CONTROL METHOD OF POSITION DETECTION SYSTEM

• US 20150205345A1
• Filed: 01/16/2015
• Published: 07/23/2015
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: PAWLAK, Karol Marcin, KUBOTA, Shinji, NAESS, Hallvard, NJOLSTAD, Tormod, MOEN, Sverre Dale
• Granted Patent: US 9,639,165 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/017 Gesture based interaction, e.g. based on a set of recognized hand gestures interaction based on gestures traced on a digitiser G06F3/04883
• CPC Class Codes: G06F 3/0304 Detection arrangements using opto-electronic means constructional details of pointing devices not related to the detection arrangement using opto-electronic means G06F3/033; optical digitisers G06F3/042
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386

Abstract

A projection system includes a light emitting apparatus that emits detection light to a detection area for detecting indication positions of indicators, and a projector that detects the indication positions of the indicators in the detection area. The projector includes an imaging portion that captures an image of the detection area, and a position detection portion that detects at least one of an image of light generated by the indicator and an image of the detection light reflected on the indicator from data of a captured image of the imaging portion, and discriminates and detects the indication positions of the indicator and the indicator based on light emission timings of the indicator and the light emitting apparatus.

Claims

1. A position detection system comprising:

a light emitting apparatus that emits detection light to a detection area for detecting indication positions of indicators; and

a position detection apparatus that detects the indication positions of the indicators in the detection area,

wherein the position detection apparatus includes an imaging portion that captures an image of the detection area, and a position detection portion that detects at least one of an image of light generated by a first indicator of the indicators and an image of the detection light reflected on a second indicator of the indicators from data of a captured image of the imaging portion, and discriminates and detects the indication positions of the first indicator and the second indicator based on light emission timings of the first indicator and the light emitting apparatus.

2. The position detection system according to claim 1,

wherein the position detection portion detects a position of a bright spot taken in the data of captured image after the light emitting apparatus is turned off, as the indication position of the first indicator.

3. The position detection system according to claim 1,

wherein the position detection portion determines light that the plurality of first indicators turn on and off according to identification information allocated to the respective first indicators based on the data of the captured image, and discriminates and detects the indication positions of the plurality of first indicators.

4. The position detection system according to claim 1,

wherein the position detection apparatus includes a first transmitting portion that transmits a synchronization signal for informing lighting timing of the first indicator, and a second transmitting portion that transmits a signal for informing timing at which the detection light is emitted to the light emitting apparatus.

5. A control method of a position detection system that includes a light emitting apparatus that emits detection light to a detection area for detecting indication positions of indicators, and a position detection apparatus that detects the indication positions of the indicators in the detection area, the method comprising:

capturing an image of the detection area by an imaging portion; and

detecting at least one of an image of light generated by a first indicator of the indicators and an image of the detection light reflected on a second indicator of the indicators from data of a captured image of the imaging portion, and discriminating and detecting the indication positions of the first indicator and the second indicator based on light emission timings of the first indicator and the light emitting apparatus.