Image projection apparatus and presentation system

Patent metadata

Field	Value
Publication number	US-9470966-B2
Application number	US-201414453741-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Aug 14, 2013
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

The present invention is concerning an image projection apparatus comprising: a projecting unit that projects and displays on a projection surface each image in a time sharing manner for each of a plurality of color components, for an input image signal; a shooting unit that shoots a projected image on the projection surface; a shoot control unit that makes the shooting unit perform the shooting, when a detection mode of a irradiation point at which light is irradiated from an irradiation device on the projection surface is set, in timing shifted by a certain amount of time from a synchronized state to time sharing timing of each color component in the projecting unit; and an irradiation-point-position detecting unit that detects, from a projected image projected by the projecting unit, a position of the irradiation point on the image.

First claim

What is claimed is:

1. An image projection apparatus comprising:
a projecting device that projects and displays on a projection surface each image in a time sharing manner for each of a plurality of color components, for an input image signal, wherein the projecting device includes a color wheel having a plurality of different color filters that are used to project the plurality of color components;
an image capturing device that captures a projected image on the projection surface; and
circuitry configured to:
detect, on the projection surface, a color of an irradiation point irradiated from an irradiation device;
determine a timing with respect to one of the plurality of color components based on the detected color of the irradiation point, the determined timing representing a timing in which the one of the plurality of color components is not projected by the projecting device;
set a period of exposure time in relation to the plurality of different color filters, the set period of exposure time being set to a period from a point of time delayed from a start of the determined timing to a point of time earlier than an end of the determined timing; and
detect a position of the irradiation point based on the capturing of the projected image during the set period of exposure time.

2. The image projection apparatus according to claim 1 , wherein
the plurality of color filters are arranged on an identical circumference in sections and pass light from a light source, and
the circuitry is further configured to:
detect a rotation position of the color wheel, and
control the image capturing device to perform the capturing based on the detected rotational position.

3. The image projection apparatus according to claim 2 , wherein
the circuitry is further configured to set a shutter timing along with the set period of exposure time.

4. The image projection apparatus according to claim 1 , wherein
the circuitry is further configured to perform an image processing to display a predetermined emphasizing display image at the detected position of the irradiation point, or perform an image processing to display an image corresponding to image data in a part of an area around the detected position of the irradiation point in an enlarge manner.

5. The image projection apparatus according to claim 1 , wherein the circuitry is further configured to:
detect a plurality of different colors of the irradiation device.

6. The image projection apparatus according to claim 1 , further comprising:
additional image capturing devices, wherein the circuitry is configured to control the image capturing device to perform the capturing or the additional image capturing devices to perform capturing of a projected image, based on the detected color.

7. A presentation system comprising:
a projecting device that projects and displays on a projection surface each image in a time sharing manner for each of a plurality of color components, for an input image signal, wherein the projecting device includes a color wheel having a plurality of different color filters that are used to project the plurality of color components;
an image capturing device that captures a projected image on the projection surface;
a irradiation device that forms an irradiation point by irradiating light onto the projection surface; and
circuitry configured to:
detect, on the projection surface, a color of the irradiation point irradiated from the irradiation device;
determine a timing with respect to one of the plurality of color components based on the detected color of the irradiation point, the determined timing representing a timing in which the one of the plurality of color components is not projected by the projecting device;
set a period of exposure time in relation to the plurality of different color filters, the set period of exposure time being set to a period from a point of time delayed from a start of the determined timing to a point of time earlier than an end of the determined timing;
detect a position of the irradiation point based on the capturing of the projected image during the set period of exposure time.

8. The presentation system according to claim 7 , wherein
the circuitry is further configured to determine whether or not a detection mode of the irradiation device is set, by detecting power-on and off of the irradiation device by any one of wireless and wired communication.

Assignees

• Sumiyoshi Shinichi
• Nakashige Fumihiro
• Nakata Otoichi
• Ricoh Co Ltd

Inventors

• Sumiyoshi Shinichi
• Nakashige Fumihiro
• Nakata Otoichi

Classifications

• H04N23/73

  by influencing the exposure time · CPC title

• G06F3/0386

  for light pen · CPC title

• H04N9/3114

  by using a sequential colour filter producing one colour at a time · CPC title

• G06F3/0425

  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) · CPC title

• G03B17/54

  with projector · CPC title