KR20080044654A - Method and apparatus for auto image controlling in a projector - Google Patents

Abstract

A method and an apparatus for automatically adjusting an image of a projector are provided to recognize it's own 3D position and project a suitable image on the most suitable screen in a current position. A UWB(Ultra Wideband) module(202) receives an image data signal and screen position information from the outside, measures position information of a projector, and transmits the measured position information to a control unit(208). A tilt sensor measures a tilt and a direction of the projector, and transmits the measured information to the control unit. The control unit measures a distance between a screen and the projector, accesses a focusing correction value corresponding to the measured distance value from a database(210), and outputs the accessed focusing correction value to a focusing correction unit(212). The control unit produces key-stone information from a height difference value between the projector and the screen and the tilt and direction information measured in the tilt sensor, accesses a key-stone correction value corresponding to the key-stone information from the database, and outputs the accessed key-stone correction value to a key-stone correcting unit(214). The focusing correction unit performs focusing correction on the basis of the focusing correction value. The key-stone correcting unit performs key-stone correction on the basis of the key-stone correction value. A display unit(216) displays the image data signal through the projector corrected from the focusing correction unit and the key-stone correcting unit.

Description

METHOD AND APPARATUS FOR AUTO IMAGE CONTROLLING IN A PROJECTOR}

1 is a view showing a position calculation method of a projector according to a preferred embodiment of the present invention;

2 is a block diagram showing the structure of an automatic image adjusting device according to an embodiment of the present invention;

3 is a flow chart illustrating a focusing and keystone correction procedure of a projector in accordance with a preferred embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image adjustment technique in a projector, and more particularly, to an automatic image adjustment method and apparatus for a projector suitable for adjusting an image of a projector using ultra wideband communication technology and an inclination sensor.

Today's projectors are miniaturized and portable so that they can no longer be fixed in one place, but can be moved anywhere in the building and used. But each time you need to adjust the focus and key-stone of the image. Many researches have been conducted for auto focusing and key toning. The conventional auto focusing technique of the projector includes an auto-type autofocusing method, which is a method of projecting an arbitrary image from a projector and then using an autofocusing system of an attached camera. There is a method of performing a mathematical correction by projecting an image of a predetermined pattern on the camera image photographed.

However, as described above, in the auto focusing and keystone correction method of the projector, there is a problem in that a camera module is additionally required in the projector, and a series of image processing, analysis, and correction processes input to the camera module are additionally required.

The present invention is to overcome the above-mentioned limitations of the prior art, a projector including a UWB module having a position recognition function to recognize the three-dimensional position of its own to project an image suitable for the most suitable screen from the current position It is an object of the present invention to provide an automatic image adjusting method and apparatus.

Another object of the present invention is to automatically adjust the focus of the image using the position tracking function of the UWB, and to automatically adjust the keystone using the tilt information sensor and the position information of the screen and the projector obtained from the UWB module and mounted separately to the projector To provide a method and apparatus for automatic image adjustment of a projector.

An embodiment of the present invention is a method for automatically adjusting an image of a projector, the method including receiving image data signals and screen position information from an external device, and using the screen position information and an ultra wide band communication technology (UWB) module. Measuring a distance between the screen and the projector based on projector position information, accessing a focusing correction value corresponding to the measured distance value from a database, and performing focus correction with the accessed focusing correction value; And calculating keystone information from the difference between the height difference between the projector and the screen, and the tilt and direction information obtained using the tilt sensor, and accessing a corresponding keystone correction value from a database, and correcting the keystone using the accessed keystone correction value. And performing the focus and keystone beam Through the projector it includes the step of displaying the image data signal.

Another embodiment of the present invention is an apparatus for automatically adjusting an image of a projector, comprising: an ultra wideband communication technology module (UWB) for receiving an image data signal and screen position information from an external device, measuring the position information of a projector, and transmitting the measured position information to a controller; A tilt sensor for measuring the tilt and the direction of the projector and transmitting the measured information to a controller, a distance between the screen and the projector, and accessing a focusing correction value corresponding to the measured distance value from a database; Outputs the accessed focusing correction value to a focusing correction unit, calculates keystone information from the height difference between the projector and the screen, and the tilt and direction information measured by the tilt sensor, and stores a keystone correction value corresponding to the keystone information. From the keystone correction unit and accessing the accessed keystone correction value. An image data signal through a control unit for outputting, a focus correction unit performing focusing correction based on the focusing correction value, a keystone correction unit performing keystone correction based on the keystone correction value, and a projector corrected from the correction units It includes a display unit for displaying.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention automatically adjusts the focus of an image using a position tracking function of ultra wideband communication technology (UWB), and uses a keystone using position information obtained from the UWB and direction and tilt values obtained from the tilt sensor. Is to adjust automatically.

In the present invention, the UWB's location recognition function and short-range high capacity data transmission method are used. Current UWB technology enables location recognition within a 1 cm error within a specific building. It is also assumed that the location of all appliances and appliances in an office environment is stored in a server (installed in a building or per conference room) using a radio frequency identification (RFID) tag or UWB. In this case, if the position of the existing screens to be projected is known in advance, the projector equipped with the UWB position recognition module can recognize the position in the building or the room, and correct the focusing and keystone of the image with the closest or most suitable screen. .

1 is a view showing a position structure of a projector according to a preferred embodiment of the present invention.

Referring to FIG. 1, a screen 100 and a projector 104 exist in a conference room, and location information x1, y1, z1 of the screen is stored on the server 102. The projector 104 uses the UWB to measure the position (X, Y, Z) of the current moving location to obtain a three-dimensional position value (x, y, z) including the height, and the distance X between the screen and the projector is The screen position information received from the server 102 and the projector position value obtained from the UWB can be obtained. Accordingly, the projector 104 performs auto focusing based on the obtained X value.

In addition, the keystone correction value may be obtained by combining the three-dimensional coordinate values (screen and projector position information) by obtaining tilt information (direction and tilt information) obtained from the acceleration sensor and the magnetic north sensor attached to the projector 104.

2 is a block diagram illustrating a structure of an automatic image adjusting device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the automatic image correction device includes a UWB 202, an acceleration sensor 204, a magnetic north sensor 206, a controller 208, a database 210, a keystone correction unit 212, and a focus correction unit 214. ) And a display unit 216.

The UWB 202 receives data from the outside and screen location information from a server that stores location information of screens in a conference room. In addition, by calculating the position of the projector, it is possible to obtain a three-dimensional coordinate value (x, y, z) including the height. In addition, the acceleration sensor 204 detects an inclination state, extracts an inclination value, detects a direction in the magnetic north sensor 206, extracts accurate direction information, and transmits the inclination information to the controller 208.

The controller 208 receives a data signal, a screen position value, and a projector position value transmitted from the UWB 202, calculates a distance between the position values, and stores a focusing correction value corresponding to the calculated distance value in the database 210. And access to the focus correction unit 212. In this case, since there may be a plurality of screen position information when there are a plurality of screens in the conference room, in this case, the controller 208 selects the closest or most suitable screen position information on the projector.

In addition, the controller 208 receives inclination and direction information from the acceleration sensor 204 and the magnetic north sensor 206, respectively, and combines with the projector and the screen position values to provide keystone correction information (hereinafter referred to as "keystone information"). .) Is calculated and the corresponding keystone correction value is accessed from the database 210 and output to the keystone correction unit 214. The keystone information may be a difference value between the height of the screen and the height on which the projector is placed, the up and down tilt angle information, and the left and right direction information.

The database 210 stores optimal keystone correction values according to the tilt, direction, and height of the projector with respect to the screen, and optimal focusing correction values according to the distance between the screen and the projector. Accordingly, the keystone correction value and the focusing correction value corresponding to the information transmitted from the controller 208 are found and transmitted to the controller 208.

The focus correcting unit 212 performs auto focusing by adjusting a focus lens based on a focusing value included in an image signal received through the control unit 208. The keystone correction unit 214 corrects the keystone by the keystone correction value included in the image signal input through the control unit 208. That is, the keystone correction is performed to properly distort the image image based on the tilt, the direction information and the height value of the screen. Thereafter, the display unit 216 displays the image signals through the focus correction unit 212 and the projector corrected by the keystone correction unit 214.

3 is a flowchart illustrating a focusing and keystone correction procedure of a projector according to a preferred embodiment of the present invention.

Referring to FIG. 3, in step 302, when the projector is powered on or automatically calibrates as the user inputs a menu key, in step 304, the UWB position recognition module is used to recognize the 3D position of the projector in the building. Get the current position value (x, y, z). Thereafter, in step 306, the inclination and direction values a and b, which are the state values of the current projector, are obtained from the acceleration sensor and the magnetic north sensor. In step 308, the appropriate screen position is found from the positions of the peripheral screens stored in the server. In this case, an example of the algorithm for finding the screen is to find the screen located in front of the place where the projector is placed).

The focusing of the image is automatically performed by calculating the distance from the screen to the projector found in step 310, accessing the optimal focusing correction value according to the calculated distance from the database, and adjusting the position of the focusing lens with the obtained focusing correction value. Adjust In operation 212, the keystone correction value is calculated by combining the screen position and the projector information to calculate the keystone correction value. This displays the image data signal on the projector with autofocus and keystone correction, allowing the user to automatically adjust the image just by power-on or menu key input.

As described above, the present invention adjusts the focus of the image using the position tracking function of the UWB, and automatically adjusts the keystone using the position information obtained from the UWB and the direction and tilt information using the tilt sensor.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention, by receiving the position value of the projector from the UWB and the tilt information of the projector from the tilt sensor to perform the auto focus and keystone correction, it is possible to view the image automatically corrected when the power is turned on or menu key input Therefore, there is an effect that provides user convenience when moving the projector.

Claims (6)

As the automatic image adjustment method of the projector, Receiving image data signals and screen position information from the outside; Measuring the distance between the screen and the projector based on the projector position information obtained using the screen position information and the UWB module; Accessing a focusing correction value corresponding to the measured distance value from a database; Performing focus correction on the accessed focusing correction value; Calculating keystone information from the difference between the height difference between the projector and the screen and the tilt and direction information obtained using the tilt sensor, and accessing a corresponding keystone correction value from a database; Performing keystone correction with the accessed keystone correction value; Displaying image data signal through the focus and keystone corrected projector Automatic image adjustment method of the projector comprising a. The method of claim 1, The tilt sensor is, Automatic image adjustment method of the projector, characterized in that the acceleration sensor and magnetic north sensor. The method of claim 1, The process of accessing from the database, And a focusing correction value corresponding to each distance value stored in the database, and a keystone correction value corresponding to the keystone information, respectively. As the automatic image adjustment device of the projector, An ultra-wideband communication technology module (UWB) which receives image data signals and screen position information from the outside, measures the position information of the projector, and transmits the measured position information to the control unit; A tilt sensor which measures the tilt and the direction of the projector and transmits the measured information to a controller; Measure a distance between the screen and the projector, access a focusing correction value corresponding to the measured distance value from a database, and output the accessed focusing correction value to a focusing correction unit, Keystone information is calculated from the height difference value between the projector and the screen and the tilt and direction information measured by the tilt sensor to access a keystone correction value corresponding to the keystone information from a database, and the keystone correction value is used as a keystone correction unit. A control unit for outputting A focus correction unit performing focusing correction based on the focusing correction value; A keystone correction unit for performing keystone correction based on the keystone correction value; A display unit for displaying an image data signal through the projector corrected from the correction unit Automatic image adjustment device of the projector comprising a. The method of claim 4, wherein The tilt sensor is, An automatic image adjusting device for a projector, which is an acceleration sensor and a magnetic north sensor. The method of claim 4, wherein The database, And a focusing correction value corresponding to each of the distance values, and a keystone correction value corresponding to the keystone information, respectively.

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