Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Reexamination Certificate
2001-02-08
2004-09-07
Eisen, Alexander (Department: 2674)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
C345S156000
Reexamination Certificate
active
06788289
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a system and method of pointed position detection that use a differential image, a presentation system and a program.
2. Description of Related Art
It is already known in the art to use a CCD camera to acquire an image display region in which a pointing action is implemented, during a presentation, and detect the pointed position.
There are serious problems concerning how the position is to be detected in such a case.
In one method that has been proposed for detecting such a position, differential images of a plurality of frames are extracted in sequence, and the tip of the pointed position is detected.
Since it is not possible with this method to extract a differential image accurately when the pointing action is halted, however, it can be difficult to detect the pointed position.
SUMMARY OF THE INVENTION
The present invention was devised in the light of the above described technical problem and has as an objective thereof the provision of a pointed position detection system and method, a system, a projector and a program that make it possible to create a suitable differential image, even when the pointing action is in a halted state, when using such a differential image.
(1) According to a first aspect of the present invention, there is provided a pointed position detection system which detects a position pointed by a pointer within a predetermined image display region, the system comprising:
image pick-up means for picking up an image of the image display region;
means for storing an image for differential image generation which is generated by picking up an image of the image display region on which a uniform image is displayed;
differential image extraction means for extracting a differential image based on the image for differential image generation and a pointing image which is generated by picking up an image of the image display region in which a pointing action is performed; and
means for detecting a pointed position in the pointing image comprised within the image display region, based on the extracted differential image.
(2) According to a second aspect of the present invention, there is provided a pointed position detection system which detects a position pointed by a pointer within a predetermined image display region, the system comprising:
image pick-up section for picking up an image of the image display region;
section for storing an image for differential image generation which is generated by picking up an image of the image display region on which a uniform image is displayed;
differential image extraction section for extracting a differential image based on the image for differential image generation and a pointing image which is generated by picking up an image of the image display region in which a pointing action is performed; and
section for detecting a pointed position in the pointing image comprised within the image display region, based on the extracted differential image.
(3) According to a third aspect of the present invention, there is provided a computer-usable program embodied on an information storage medium or in a carrier wave for implementing a presentation system that detects a pointed position in a predetermined image display region, the program implementing in a computer:
means for storing an image for differential image generation which is generated by picking up an image of the image display region on which is displayed a uniform image by means of image pick-up means;
differential image extraction means for extracting a differential image based on the image for differential image generation and a pointing image which is generated by picking up an image of the image display region in which a pointing action is performed; and
means for detecting a pointed position in the pointing image comprised within the image display region, based on the extracted differential image.
(4) According to a fourth aspect of the present invention, there is provided a pointed position detection method of detecting a position pointed in a predetermined image display region, the method comprising the steps of:
storing an image for differential image generation which is generated by picking up an image of the image display region on which is displayed a uniform image;
extracting a differential image based on the image for differential image generation and a pointing image which is generated by picking up an image of the image display region in which a pointing action is performed; and
detecting a pointed position in the pointing image comprised within the image display region, based on the extracted differential image.
This aspect of the invention makes it possible to create a suitable differential image in which is reflected the pointed position when the pointing action is in a halted state, by obtaining a difference between a uniform image and an image in which the pointing action is performed, thus making it possible to accurately detect the pointed position.
(5) The image for differential image generation and the pointing image may be generated by picking up an image formed by invisible rays.
This makes it possible to perform image processing based on a suitable image that is not greatly affected by the light projected into the image display region during the processing of the image, by applying an image that was formed by invisible rays, thus increasing the accuracy with which the pointed position is detected.
(6) The invisible rays may be infrared rays; and the image pick-up means may pick up an image formed by infrared rays, through an infrared transmission section that allows only infrared rays to pass.
This eliminates unwanted light components by taking an image formed by infrared rays through the infrared-transmission section. As a result, accurate position detection is achieved by a reduction in the noise generated by changes in the unwanted light components.
Note that the infrared rays in this case are generally electromagnetic waves of wavelengths of 700 nm to 1 mm.
(7) The pointed position detection system may further comprise an auxiliary light source which projects infrared rays toward the image display region when picking up an image formed by infrared rays.
This provision of an auxiliary light source ensures that infrared rays can be provided for the pickup of the image, even when the system is used in a location without sunlight.
(8) The pointed position detection system may further comprise:
image display means for displaying an image in the image display region; and
control means for determining whether or not update of the image for differential image generation is necessary, based on the differential image which has been extracted based on the image for differential image generation and a non-pointing image generated by picking up an image of the image display region in which no pointing action is performed, and controlling the image display means to display the uniform image for a predetermined short period of time and also controlling the image pick-up means to pick up an image of the image display region in which the uniform image is displayed and thus capture a new image for differential image generation, when the update is necessary.
(9) The program may further implement in a computer, control means for determining whether or not update of the image for differential image generation is necessary, based on the differential image which has been extracted based on the image for differential image generation and a non-pointing image generated by picking up an image of the image display region in which no pointing action is performed, and controlling image display means which displays an image in the image display region to display the uniform image for a predetermined short period of time and also controlling the image pick-up means to pick up an image of the image display region in which the uniform image is displayed and thus capture a new image for differential image generation, when the update is necessary.
(10) In the pointed position detection
Eisen Alexander
Seiko Epson Corporation
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