Position detection system and control method of position detection system

• US 10,114,475 B2
• Filed: 03/23/2017
• Issued: 10/30/2018
• Est. Priority Date: 01/21/2014
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Naess, Hallvard, Njolstad, Tormod, Moen, Sverre Dale, Pawlak, Karol Marcin, Kubota, Shinji
• Primary Examiner(s): Davis, Tony
• Application Number:
  US15/467,772
• Publication Number:
  US 20170192528A1
• Time in Patent Office: 586 Days
• Field of Search: 345156, 345170-178
• 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 an indication position of an indicator; and

a position detection apparatus that includes;

an imaging portion that captures an image of the detection area, and

a position detection portion that;

detects light from the indicator based on data of the image captured by the imaging portion,

detects the indication position of the indicator in the detection area, and

determines whether the indicator is a light emitting indicator that emits light or an indicator that does not emit light, wherein the light emitting apparatus is turned on and off repeatedly, and when the indication position of the indicator is detected White the light emitting apparatus is turned off, the position detection portion determines that the indicator is the light emitting indicator.

2. The position detection system according to claim 1, wherein the position detection apparatus further includes a transmitting portion that transmits a synchronization signal that indicates a timing of light emissions of the indicator.

3. The position detection system according to claim 2, wherein the timing of light emissions of the light emitting apparatus is based on the synchronization signal.

4. A control method comprising:

emitting, by a light emitting apparatus, detection light to a detection area for detecting an indication position of an indicator;

capturing, by a position detection apparatus, an image of the detection area;

detecting, by the position detection apparatus, light from the indicator based on data of the image captured by the position detection apparatus;

detecting, by the position detection apparatus, the indication position of the indicator in the detection area; and

determining, by the position detection apparatus, whether the indicator is a light emitting indicator that emits light or an indicator that does not emit light, wherein the light emitting apparatus is turned on and off repeatedly, and when the indication position of the indicator is detected while the light emitting apparatus is turned off, the position detection portion determines the indicator is the light emitting indicator.