Presentation system and display device for use in the presentation system

• US 9,098,195 B2
• Filed: 10/27/2010
• Issued: 08/04/2015
• Est. Priority Date: 10/29/2009
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Inventors: Onodera, Shinji, Morishita, Satomi, Iwahara, Kenichi, Uchida, Yoshiharu
• Primary Examiner(s): Chow, Doon
• Assistant Examiner(s): NGUYEN, LE V
• Application Number:
  US12/912,876
• Publication Number:
  US 20110107222A1
• Time in Patent Office: 1,742 Days
• Field of Search: 715/863, 715/752, 715/800, 715/730
• US Class Current: 1/1
• CPC Class Codes: G06F 3/01 Input arrangements or combined input and output arrangements for interaction between user and computer G06F3/16 takes precedence
• 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
• CPC Class Codes: G06F 3/04817 using icons graphical or visual programming using iconic symbols G06F8/34
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
• CPC Class Codes: G06T 11/60 Editing figures and text; Combining figures or text
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/4143 embedded in a Personal Computer [PC]
• CPC Class Codes: H04N 21/42202 environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
• CPC Class Codes: H04N 21/4223 Cameras H04N23/00 takes precedence
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 5/44504 Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A display device according synthesizes icons and messages with a portion where no descriptive display image is displayed by OSD for display. Icon functions are set by a PC so that the setting of the operation of the PC and the display device, and the setting of an external device can be conducted. The number of lines of the message to be displayed is determined according to distortion correction at the case of oblique projection to correct position coordinates detected by a camera. In a presentation system including an interactive white board device, the display device (for example, a liquid crystal projector), and the PC, the display of the icons are improved to extend the functions, and the display of the messages at the case of oblique projection, and a position detection precision on a screen by the camera incorporated into the display device are improved.

Claims

1. A display device for use in a presentation system, which optically emits an image to an interactive white board device having a display section of the image for displaying the image, the display device comprising:

a display device control section comprising a central processing unit, the display device control section controls the operation of the display device;

an image processing section that reduces a first image input to the display device in a vertical direction to generate a second image on the basis of a command related to a projection angle to the interactive white board from the display device control section;

an OSD display control section that generates a third image which is displayed together with the second image on the basis of a command from the display device control section;

an OSD synthesis processing section that synthesizes the second image and the third image without superimposition with each other to generate a fourth image;

a distortion correction processing section that reduces the fourth image in a horizontal direction according to a vertical position of the fourth image on the basis of the command related to the projection angle to the interactive white board from the display device control section to generate a fifth image; and

an optical display section that optically emits the fifth image to the interactive white board,

wherein the display device control section controls the OSD display control section so as to generate the third image to modify its display form in the vertical direction according to the reduction processing of the first image in the vertical direction in the image processing section by reducing a number of scanning lines,

to synthesize the second image that is the inputted image of which width in the vertical direction is reduced and the third image that is an OSD image after both images are generated separately, and

to reduce the synthesized image in the horizontal direction according to the projection angle and to correct the distortion.

2. The display device for use in a presentation system according to claim 1, wherein when the third image is a character message display image, the display device control section controls the OSD display control section so as to reduce the number of scanning lines in the vertical direction of the character message.

3. The display device for use in a presentation system according to claim 1, wherein when the third image is an icon display image, the display device control section controls the OSD display control section so as to reduce intervals in the vertical direction between icons of the icon display image.

4. The display device for use in a presentation system according to claim 1, further comprising:

an image pickup section that picks up a fifth image displayed on the interactive white board device disposed along an optical axial direction of the optical display section,

wherein the third image generated by the OSD display control section includes an icon corresponding to a function for setting the function of a device including a device connected to the external of the display device, and

wherein the display device control section generates, when a user of the display device for use in the presentation system indicates a specific position of the interactive white board device, the position coordinate information on the specific position on the basis of the fifth image picked up by the image pickup section.

5. The display device for use in a presentation system according to claim 4, wherein the display device control section corrects an error of the position coordinate information accompanied by the reduction processing in the image processing section and the reduction processing.

6. The display device for use in a presentation system according to claim 5, wherein the display device control section corrects the error of the position coordinate information on the basis of the position coordinate information on a corner of the image in the fifth image picked up by the image pickup section.