Image projection device

Patent metadata

Field	Value
Publication number	US-9401129-B2
Application number	US-201414330078-A
Country	US
Kind code	B2
Filing date	Jul 14, 2014
Priority date	Jul 25, 2013
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

An image projection device includes: a drive controller that causes generation of light of a specified color tone by a combination of light to be transmitted by a liquid crystal panel to project image data onto a projection plane; an image capturing controller that receives a synchronization signal that specifies a period in which the liquid crystal panel does not transmit light from the drive controller and causes capturing of an image of the projection plane according to the period that is specified by the synchronization signal; an illuminated image detector that detects, from the captured image of the image data, an illuminated image that is illuminated by an illuminating device on the projection plane; and an illuminated image generator that generates projection image data obtained by combining given image data in a position in which the illuminated image is detected.

First claim

What is claimed is:

1. An image projection device, comprising:
a drive controller that causes generation of light of a specified color tone by a combination of light to be transmitted by a liquid crystal panel to project image data onto a projection plane;
a camera configured to capture an image of the image data projected on the projection plane;
an image capturing controller that receives, from the drive controller, a synchronization signal that specifies a period in which the liquid crystal panel does not transmit light, and causes capturing of the image of the image data projected on the projection plane by the camera according to the period specified by the synchronization signal, wherein a drive frequency to drive the liquid crystal panel is equal to a drive frequency to perform exposure with the camera;
an illuminated image detector that detects, from the captured image of the image data, an illuminated image that is illuminated by an illuminating device on the projection plane; and
an illuminated image generator that generates projection image data obtained by superimposing new image data at a position in which the illuminated image is detected.

2. The image projection device according to claim 1 , wherein the illuminated image generator generates, at a set of coordinates of the detected illuminated image, an enlarged image of an area of the new image data, the area being determined according to the set of coordinates of the detected illuminated image, as the projection image data.

3. The image projection device according to claim 1 , wherein the illuminated image generator generates, at a set of coordinates of the detected illuminated image, an enlarged image of the illuminated image as the new image data.

4. An image projection device, comprising:
a drive controller that causes generation of light of a specified color tone by a combination of light to be transmitted by a liquid crystal panel to project image data onto a projection plane;
a camera configured to capture an image of the image data projected on the projection plane;
an image capturing controller that receives, from the controller, a synchronization signal that specifies a period in which the liquid crystal panel does not transmit light, and causes capturing of the image of the image data projected on the projection plane according to the period specified by the synchronization signal, wherein a drive frequency to drive the liquid crystal panel is equal to a drive frequency to perform exposure with the camera;
a light spot device that generates a light spot around the projection plane from the captured image data by applying a stress onto the projection plane;
a light spot detector that detects the light spot generated by the light spot device around the projection plane; and
a light spot image generator that generates projection image data obtained by superimposing new image data at a position in which the light spot is detected.

5. The image projection device according to claim 4 , wherein the light spot generator generates, at a set of coordinates of the detected light spot, an enlarged image of an area of the new image data, the area being determined according to the set of coordinates of the detected light spot, as the projection image data.

6. The image projection device according to claim 4 , wherein the light spot generator generates, at a set of coordinates of the detected light spot, an enlarged image of the light spot as the new image data.

Assignees

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

Inventors

• Nakata Otoichi
• Nakashige Fumihiro
• Sumiyoshi Shinichi

Classifications

• G06F3/0304 Primary

  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 title

• H04N9/3194

  including sensor feedback · 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

• H04N5/74

  Projection arrangements for image reproduction, e.g. using eidophor · CPC title

• G09G5/18 Primary

  Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) · CPC title