KR20140077316A - Apparatus and method for measurement depth - Google Patents

Apparatus and method for measurement depth Download PDF

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Publication number
KR20140077316A
KR20140077316A KR1020120145948A KR20120145948A KR20140077316A KR 20140077316 A KR20140077316 A KR 20140077316A KR 1020120145948 A KR1020120145948 A KR 1020120145948A KR 20120145948 A KR20120145948 A KR 20120145948A KR 20140077316 A KR20140077316 A KR 20140077316A
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KR
South Korea
Prior art keywords
depth value
image
screen
projector
present
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KR1020120145948A
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Korean (ko)
Inventor
기명석
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한국전자통신연구원
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Priority to KR1020120145948A priority Critical patent/KR20140077316A/en
Publication of KR20140077316A publication Critical patent/KR20140077316A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N2013/0074—Stereoscopic image analysis
    • H04N2013/0081—Depth or disparity estimation from stereoscopic image signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

A stereoscopic image projector for projecting a first pattern image and a second pattern image on a screen, a camera for photographing a first pattern image and a second pattern image, and a parallax between the first pattern image and the second pattern image, And a depth value measuring unit for measuring a depth value.

Description

[0001] APPARATUS AND METHOD FOR MEASUREMENT DEPTH [0002]

Embodiments of the present invention relate to an apparatus and method for measuring a depth of a rendered screen using a stereoscopic image projector.

A method of using a plurality of projectors in combination to output a large-screen image has advantages in cost and configuration, and is widely used in exhibitions, video performances, and the like.

In order to output such a large image as a single image using a plurality of projectors, there is a need for an image processing technique for correcting image blending according to blending or screen shape of the projector.

However, since general projectors except for special projectors are designed to project images on a square plane, projecting on a cylinder or sphere or a screen with arbitrary free form, rather than a plane, Can be corrected, but a focus error caused by a difference in projection distance between the screen and the projector can not be solved.

For the above reasons, measuring the depth of the screen as well as the 2D form of the screen, which is simply visible, is an important factor in determining the image quality of the rendered image.

As a method for measuring the depth value of such a non-planar screen, a special projector capable of measuring the distance between the screen and the projector using a laser beam or a method of measuring the depth value by projecting specific structured patterns Can be used. However, a projector using a laser beam is more expensive than a general projector, and a method of projecting a structured pattern may cause distortion depending on a projection direction of a projector, a screen shape, and a camera environment for acquiring a projected image.

An embodiment of the present invention provides an apparatus and method for acquiring a depth value from a projector projection position to a screen using a projector and a camera in which stereoscopic image projection is supported.

One embodiment of the present invention has less influence on the position of the projector and the camera compared to the structured pattern projection and provides data for restoring distortions or focus errors of the projection image when using the depth value of the measured screen.

A depth value measuring apparatus according to an embodiment of the present invention includes a stereoscopic image projector for projecting a first pattern image and a second pattern image on a screen, a camera for photographing the first pattern image and the second pattern image, And a depth value measuring unit for analyzing the parallax between the one pattern image and the second pattern image and measuring the depth value of the screen.

According to an embodiment of the present invention, an apparatus and method for acquiring a depth value from a projector projection position to a screen using a projector and a camera that support stereoscopic image projection can be provided.

According to an embodiment of the present invention, the influence of the position of the projector and the camera on the position of the projected camera is smaller than that of the structured pattern projection, and when the depth value of the measured screen is used, .

FIG. 1 is a block diagram showing a configuration of a depth value measuring apparatus according to an embodiment of the present invention. Referring to FIG.
2 is a diagram illustrating an external configuration of a depth value measuring apparatus according to an embodiment of the present invention.
3 is a diagram illustrating an example of measuring the depth value of a screen according to one aspect of the present invention.
4 is a diagram illustrating an example of projecting an image using a stereoscopic image projector according to an embodiment of the present invention.
5 is a view showing a specific configuration of a depth value measuring apparatus according to an aspect of the present invention.
6 is a flowchart illustrating a depth value measurement method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terminology used herein is a term used for appropriately expressing an embodiment of the present invention, which may vary depending on the user, the intent of the operator, or the practice of the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

A depth value measuring apparatus according to one aspect of the present invention can solve a focus error caused by a difference in projection distance between a screen surface and a projector when projecting an image using a projector on a sphere, cylinder, or non- have.

FIG. 1 is a block diagram showing a configuration of a depth value measuring apparatus according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 1, an apparatus 100 for measuring a depth value according to an aspect of the present invention includes a stereoscopic image projector 110, a camera 120, and a depth value measuring unit 130.

According to one aspect of the present invention, the stereoscopic image projector 110 projects a first pattern image and a second pattern image on a screen, and the camera 120 photographs a first pattern image and a second pattern image. Also, the depth value measuring unit 130 analyzes the parallax between the first pattern image and the second pattern image, and measures the depth value of the screen.

In a system for recognizing a stereoscopic image, when the projector is not planar, when the projector is not flat, a focus error of the projection image may occur due to different depth values of two or more images. The depth value measuring apparatus 100 according to one side may provide a method of adjusting the focus of an image according to a depth value in a screen providing a stereoscopic image.

A depth value measuring apparatus 100 according to an embodiment of the present invention projects a specific pattern onto a screen using a stereoscopic image projector 110, photographs a projected image pattern with a camera 120, So that the depth value of the screen can be analyzed.

2 is a diagram illustrating an external configuration of a depth value measuring apparatus according to an embodiment of the present invention.

2, a depth value measuring apparatus according to an embodiment of the present invention includes a stereoscopic image projector 210 capable of projecting a stereoscopic image on a screen 211, a camera 220 for capturing a projected image, And a depth value measuring unit 230 for measuring the depth value of the screen by analyzing the photographed image.

According to one aspect of the present invention, the principle of a stereoscopic image projector is a method of projecting two images having right and left parallaxes from one projector and allowing a user to wear a separate stereoscopic glasses to recognize depth values due to parallax between the left eye and right eye Can be applied. The depth value measuring apparatus can provide a method of measuring the depth value of the screen by using the function of the stereoscopic image projector 210. [

3 is a diagram illustrating an example of measuring the depth value of a screen according to one aspect of the present invention.

Referring to FIGS. 2 and 3, the stereoscopic image projector 210 can project left and right images having a certain left and right parallax distance on a screen for depth value measurement. Here, since the left and right images have points having different colors or a normalized shape, the depth value measuring apparatus can easily analyze them.

The depth value measuring apparatus generates the left image 310 and the right image 320 and then simultaneously projects the left and right images 310 and 320 on the screen using the stereoscopic image projector 210. Then, The left and right images can be projected on the screen while maintaining a constant distance.

The depth value measuring apparatus can measure the depth value of the image projected on the screen when the user projects the image on the non-planar screen in which the depth value changes according to a position other than the plane using the stereoscopic image projector 210 have.

4 is a diagram illustrating an example of projecting an image using a stereoscopic image projector according to an embodiment of the present invention.

As shown in FIG. 4, the stereoscopic image projector according to one aspect of the present invention can project a stereoscopic image while fixing a focal distance and converting a depth value, and the depth value measuring unit displays a stereoscopic image by projecting a stereoscopic image, The depth value can be estimated.

According to one aspect of the present invention, when the user projects an image having a constant parallax of the left and right image points in accordance with the focal distance d of the screen 420, the parallax between the images projected on the screen 420 becomes the depth value of the screen It can be the default value for measurement.

For example, if the depth value of the screen is ahead of the position that the user wants to project, the distance between the two image points may be tx away from the parallax between the two image points on the screen 420. [

As another example, in the case of a screen having a depth value deeper than the screen set as a reference by the user such as the screen 430, if the parallax between two points is getting closer to the reference parallax and the depth value is sufficiently long, May be changed.

In order to measure the depth value of the projection surface of the screen, the depth value measuring device according to one aspect of the present invention projects a pattern composed of a set of points described above and measures the distance between the point of the left image and the point of the right image, The relative depth value of the whole can be measured.

In addition, the depth value measuring apparatus can measure the relative depth value of the screen through the parallax between the left and right image patterns when a specific set of left and right pattern images is projected onto the screen and acquired by the camera.

5 is a view showing a specific configuration of a depth value measuring apparatus according to an aspect of the present invention.

5, the left and right pattern image generators 510 generate specific left and right pattern images for projecting on the screen, and the stereoscopic image projector 520 can project the generated specific left and right pattern images onto the screen (540 ).

According to one aspect of the present invention, the camera 530 photographs the projected specific left and right patterns using the projection image capturing unit 550 (550).

The depth value measuring apparatus measures the parallax between the photographed left and right pattern images using the image parallax measurer 560 and analyzes the parallax between the left and right pattern images using the parallax analyzer 570.

The depth value measuring apparatus can analyze the depth value of the image on the screen based on the parallax between the left and right pattern images using the depth value measuring unit 580. [

6 is a flowchart illustrating a depth value measurement method according to an embodiment of the present invention.

Referring to FIG. 6, the depth value measuring apparatus projects a first pattern image and a second pattern image on a screen (610).

The depth value measuring apparatus captures the first pattern image and the second pattern image (620).

The depth value measuring apparatus analyzes the parallax between the first pattern image and the second pattern image, and measures the depth value of the screen (630).

An apparatus and method for measuring a depth value according to an aspect of the present invention can acquire a depth value from a projector projection position to a screen using a projector and a camera that support stereoscopic image projection.

The apparatus and method for measuring the depth value according to one aspect of the present invention have less influence on the position of the projector and the camera as compared with the structured pattern projection and when the depth value of the measured screen is used, Lt; / RTI >

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: Depth measuring device
110: stereoscopic image projector
120: camera
130: Depth value measuring unit

Claims (1)

A stereoscopic image projector for projecting a first pattern image and a second pattern image on a screen;
A camera for photographing the first pattern image and the second pattern image; And
A depth value measuring unit for analyzing a parallax between the first pattern image and the second pattern image and measuring a depth value of the screen,
And a depth value measuring device.
KR1020120145948A 2012-12-14 2012-12-14 Apparatus and method for measurement depth KR20140077316A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120145948A KR20140077316A (en) 2012-12-14 2012-12-14 Apparatus and method for measurement depth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120145948A KR20140077316A (en) 2012-12-14 2012-12-14 Apparatus and method for measurement depth

Publications (1)

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KR20140077316A true KR20140077316A (en) 2014-06-24

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