KR20080087585A - Apparatus and method for playing-back captured image - Google Patents

Apparatus and method for playing-back captured image Download PDF

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Publication number
KR20080087585A
KR20080087585A KR1020070030042A KR20070030042A KR20080087585A KR 20080087585 A KR20080087585 A KR 20080087585A KR 1020070030042 A KR1020070030042 A KR 1020070030042A KR 20070030042 A KR20070030042 A KR 20070030042A KR 20080087585 A KR20080087585 A KR 20080087585A
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KR
South Korea
Prior art keywords
pixel
value
image
compensated
gradation
Prior art date
Application number
KR1020070030042A
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Korean (ko)
Inventor
이종현
Original Assignee
삼성전자주식회사
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Priority to KR1020070030042A priority Critical patent/KR20080087585A/en
Publication of KR20080087585A publication Critical patent/KR20080087585A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/48—Details of cameras or camera bodies; Accessories therefor adapted for combination with other photographic or optical apparatus
    • G03B17/54—Details of cameras or camera bodies; Accessories therefor adapted for combination with other photographic or optical apparatus with projector
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/147—Optical correction of image distortions, e.g. keystone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence

Abstract

A capture image reproducing apparatus and a capture image reproducing method are provided to reproduce a compensated capture image having uniform luminance distributions when reproducing a capture image which is a screen image in an image projection system. A capture image reproducing apparatus includes a reproduction control unit(450), a compensator(460), and a display panel(470). The reproduction control unit outputs a gradation value of each pixel calculated from image data in correspondence to coordinates of each pixel. The compensator receives the gradation value of each pixel and information about the coordinates of each pixel to generate a compensated gradation value. The display panel receives the compensated gradation value to display the compensated capture image. The compensator includes a distance calculator, a compensating value provider, and an arithmetic unit. The distance calculator calculates a pixel distance from a center pixel to each pixel based on the information about the coordinates of each pixel. The compensating value provider provides a gradation compensating value corresponding to the pixel distance. The arithmetic unit adds the gradation value and the gradation compensating value to generate the compensated gradation value.

Description

Apparatus and method for playing-back captured image}

BRIEF DESCRIPTION OF THE DRAWINGS In order to understand the drawings referred to in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating an image projection system.

FIG. 2 is a diagram illustrating a case of capturing a screen image and reproducing a captured image in the image projection system.

FIG. 3A is a diagram illustrating a pixel distance L from the center pixel O to each pixel P. As shown in FIG.

3B is a diagram illustrating a distribution of luminance I according to each pixel distance L. FIG.

4 is a diagram illustrating a capture image reproducing apparatus according to a preferred embodiment of the present invention.

FIG. 5 is a diagram illustrating the components of the compensator 460 shown in FIG. 4.

6 is a diagram illustrating a relationship between the pixel distance L and the gray scale compensation value Pc.

7 is a diagram illustrating a luminance component IPz corresponding to the grayscale value Pz, a luminance component IPc corresponding to the grayscale compensation value Pc, and a luminance component IPzc corresponding to the compensated grayscale value Pzc. to be.

<Description of Reference Number in Drawing>

110: video projector 120, 220: screen

230: recording device 240: capture image playback device

450: playback control unit 451: decoder

452: memory 453: controller

460: compensator 470: display panel

561: distance calculator 562: reward value provider

563: operator

The present invention relates to a captured image reproducing apparatus and a captured image reproducing method. In particular, the present invention provides a compensated captured image (compensated) by receiving image data corresponding to a captured image from a photographing apparatus for capturing a screen image in an image projection system. A capture image reproducing apparatus for displaying a capture image and a capture image reproducing method.

In recent years, image projection systems have been widely used in accordance with the trend of larger display systems. An image projection system is a display system that displays an enlarged image on a large screen using an image projector. Large-sized CRTs or display panels themselves are still technically difficult and require high production costs. In contrast, an image projection system can display a large screen relatively inexpensively.

1 is a diagram illustrating an image projection system.

The image projection system includes an image projector 110 and a screen 120. The image projector 110 projects a small image obtained from a broadcast signal, a slide, a video tape, a movie film, or the like onto the screen 120. The image enlarged by the image projection is displayed on the screen 120.

Image projection systems can be broadly classified into two types.

In a front projection type image projection system, the viewer is in position A in FIG. That is, in the front projection type image projection system, the viewer detects the light projected from the image projector 110 and reflected from the screen 120. For example, an image projection system used in a movie theater belongs to a front projection type image projection system. In a rear projection type image projection system, the viewer is in position B in FIG. That is, in a rear projection type image projection system, a viewer detects light projected from the image projector 110 and transmitted through the screen 120. For example, an image projection system used in projection televisions belongs to a rear projection type image projection system. Typically, a front projection type image projection system in which the image projector 110 and the screen 120 are separated is a rear projection type image projection in which the image projector 110 and the screen 120 are integrated. Compared to the system, the screen can be enlarged more easily. However, whether in a front projection type image projection system or in a rear projection type image projection system, the enlargement of the screen may involve a lack of light quantity or an uneven distribution of luminance in a screen image. .

FIG. 2 is a diagram illustrating a case of capturing a screen image and reproducing a captured image in the image projection system.

The photographing apparatus 230 generates image data DATA by capturing a large screen image displayed on the screen 220. The captured image reproducing apparatus 240 receives image data DATA from the photographing apparatus 230 and displays a captured image corresponding to the image data DATA on the screen. The luminance distribution in the screen image or the captured image will be described with reference to FIGS. 3A and 3B.

FIG. 3A is a diagram illustrating a pixel distance L from the center pixel O to each pixel P, and FIG. 3B is a diagram illustrating a distribution of luminance I according to each pixel distance L. FIG.

Analyzing screen images in an image projection system, typically, the brightness of the central area is high while the brightness of the peripheral area is low. As shown in FIG. 3A, the pixel distance L from the center pixel O to each pixel P is calculated based on the coordinates Ox and Oy of the center pixel and the coordinates Px and Py of each pixel. As shown in FIG. 3B, the luminance I distribution according to each pixel distance L is obtained. According to its own characteristic of each image projection system, the luminance distribution characteristic in the screen image is shown as graph LI1, graph LI2 or graph LI3.

As can be seen in graphs LI1, LI2, and LI3 of FIG. 3B, the shorter the pixel distance L from the center pixel O to each pixel P is, the higher the luminance of the pixel is. The longer the pixel distance L from O) to each pixel P, the lower the luminance of that pixel. That is, the closer the pixel is from the center pixel O, the higher the luminance, and the farther from the center pixel O, the lower the luminance. The uneven distribution characteristic of luminance is shown not only in the screen image but also in the capture image capturing the screen image.

When the viewer views the screen image on the image projection system, since the human field of view is significantly narrower than that of the large screens 120 and 220, the viewer does not feel a large distribution of luminance in the large screen image. However, when the viewer views the captured image through the captured image reproducing apparatus 240, the viewer views the entire screen of the captured image reproducing apparatus 240, so that the viewer greatly reduces the image quality due to the uneven distribution of luminance in the small captured image. I feel it.

An object of the present invention is to provide a captured image reproducing apparatus and a captured image reproducing method of receiving image data of a captured image having an uneven luminance distribution and displaying a compensated captured image.

Display a compensated capture image by receiving image data corresponding to the captured image from a photographing apparatus that captures a screen image in an image projection system In the captured image reproducing apparatus, the captured image reproducing apparatus according to the present invention includes a reproducing controller, a compensator, and a display panel. The reproduction control unit outputs a gradation value of each pixel calculated from the image data corresponding to the coordinates of each pixel. The compensator receives the gray level value of each pixel and information about the coordinates of each pixel to generate a compensated gradation value. The display panel receives the compensated grayscale value and displays the compensated captured image. The compensator includes: a distance calculator that calculates a pixel distance from a center pixel to each pixel based on the information about the coordinates of each pixel; A compensation value provider for providing a gradation compensating value corresponding to the pixel distance; And an operator configured to add the gray level value and the gray level compensation value to generate the compensated gray level value.

In the present invention, the compensation value provider determines the gradation compensation value in consideration of the luminance distribution in the screen image. That is, when the luminance is higher as the pixel closer to the center pixel in the screen image and the luminance is lower as the pixel farther from the center pixel in the screen image, the compensation value provider is configured such that the compensated captured image has an equal luminance distribution. Determine the gradation compensation value. For example, the compensation value provider may provide a smaller gray scale compensation value as the pixel distance is shorter and a larger gray scale compensation value as the pixel distance is longer.

In one embodiment of the present invention, the compensation value provider may include a look up table (LUT) in which each gray level compensation value corresponding to each pixel distance is stored.

In one embodiment of the present invention, the calculator adds a gray level value of each pixel input from the reproduction control unit and a gray level compensation value of each pixel provided from the compensation value provider to compensate the gray level value of each pixel. And outputs the compensated gray value of each pixel to the display panel in correspondence with the coordinates of each pixel.

In one embodiment of the present invention, the playback control section includes: a decoder for decoding the encoded video data; A memory for storing decoded video data; And a controller configured to output the gray level value of each pixel calculated from the decoded image data corresponding to the coordinates of each pixel.

In one embodiment of the invention, the photographing apparatus is a mobile communication terminal, a digital camera, a video camera or a camcorder equipped with an image sensor.

According to a preferred embodiment of the present invention, a method of reproducing a captured image includes: capturing a screen image in an image projection system to generate image data; Calculating a gradation value of each pixel from the image data; Calculating a pixel distance from the center pixel to each pixel; Providing a gradation compensating value corresponding to the pixel distance; Generating a compensated gradation value by adding the gradation value and the gradation compensation value; And displaying a compensated captured image corresponding to the compensated grayscale value.

The gray level compensation value is determined in consideration of the luminance distribution in the screen image. When the pixel closer to the center pixel in the screen image is higher in brightness and the pixel farther from the center pixel is in lower brightness, the shorter the pixel distance, the smaller the gray level compensation value, and the longer the pixel distance, the gray level. Increase the compensation value. The gradation compensation value is determined such that the compensated captured image has an uniform luminance distribution.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related well-known configuration or function may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

4 is a diagram illustrating a capture image reproducing apparatus according to a preferred embodiment of the present invention.

4 illustrates a capture image reproducing apparatus including a reproduction controller 450, a compensator 460, and a display panel 470. The playback control section 450 includes a decoder 451, a memory 452, and a controller 453.

The captured image reproducing apparatus illustrated in FIG. 4 captures image data DATA corresponding to the captured image from a photographing apparatus that captures a screen image in an image projection system. A display device that receives an input and displays a compensated captured image. A mobile communication terminal equipped with an image sensor, a digital camera, a video camera or a camcorder may be used as a photographing device for capturing screen images in an image projection system.

The reproduction controller 450 is responsible for outputting the gradation value Pz of each pixel calculated from the image data DATA in correspondence with the coordinates Px and Py of each pixel. The decoder 451 decodes the encoded image data DATA among the components of the reproduction controller 450. The decoded video data is stored in the memory 452. The controller 453 calculates the grayscale value Pz of each pixel from the decoded image data, and outputs the grayscale value Pz of each pixel corresponding to the coordinates Px and Py of each pixel.

The compensator 460 receives the information about the gray value Pz of each pixel and the coordinates Px and Py of each pixel to generate a compensated gradation value Pzc. The components of the compensator 460 will be described with reference to FIG. 5.

FIG. 5 is a diagram illustrating the components of the compensator 460 shown in FIG. 4.

5 shows a compensator 460 having a distance calculator 561, a compensation value provider 562, and a calculator 563.

The distance calculator 561 calculates the pixel distance L from the center pixel to each pixel based on the information about the coordinates Px and Py of each pixel. That is, the distance calculator 561 calculates the pixel distance L from the information about the coordinates Ox and Oy of the center pixel in the captured image and the coordinates Px and Py of each pixel in the captured image.

The compensation value provider 562 determines a gradation compensating value Pc corresponding to the pixel distance L and provides the determined gradation compensation value Pc to the calculator 563. The compensation value provider 562 determines the gray level compensation value Pc in consideration of the luminance distribution in the screen image or the luminance distribution in the captured image. The gray level compensation value Pc will be described with reference to FIG. 6.

6 is a diagram illustrating a relationship between the pixel distance L and the gray scale compensation value Pc.

For example, when the luminance distribution characteristic in the screen image or the luminance distribution characteristic in the captured image is shown as the graph LI1 shown in FIG. 3B, the gradation compensation value Pc according to the pixel distance L is the graph shown in FIG. 6. Can be determined based on LPc1. Similarly, when the luminance distribution characteristic in the screen image or the luminance distribution characteristic in the captured image is shown as the graph LI2 or the graph LI3 shown in FIG. 3B, the gradation compensation value Pc according to the pixel distance L is shown in FIG. 6. It can be determined based on the graph LPc2 or graph LPc3 shown.

As can be seen from the graph LI1, the graph LI2 and the graph LI3 shown in FIG. 3B, and the graph LPc1, the graph LPc2 and the graph LPc3 shown in FIG. Is higher and pixels farther from the center pixel have a lower luminance, the compensation value provider 562 provides a small gray level compensation value Pc to the calculator 563 as the pixel distance L is shorter and the pixel distance L is smaller. Is larger, the larger gray level compensation value Pc is provided to the calculator 563.

The compensation value provider 562 may include a look up table (LUT) in which the pixel distance L and the gray level compensation value Pc correspond to each other based on the graph LPc1, the graph LPc2, or the graph LPc3. have. Each grayscale compensation value Pc corresponding to each pixel distance L is stored in the lookup table LUT. If necessary, an interpolation process such as Bicubic-Interpolation is performed based on the value stored in the look-up table (LUT), and the interpolated result is provided to the calculator 563 as the gradation compensation value Pc. It is possible.

In FIG. 5, the calculator 563 generates the compensated gray value Pzc by summing the gray value Pz and the gray level compensation value Pc. Specifically, the calculator 563 adds up the gradation value Pz of each pixel input from the reproduction control unit 450 and the gradation compensation value Pc of each pixel provided from the compensation value provider 562 to each pixel. It is responsible for generating the compensated grayscale value Pzc and outputting the compensated grayscale value Pzc of each pixel to the display panel 470 corresponding to the coordinates Px and Py of each pixel. A gray value Pz of each pixel, a gray level compensation value Pc of each pixel, and a compensated gray level value Pzc of each pixel will be described with reference to FIG. 7.

7 is a diagram illustrating a luminance component IPz corresponding to the grayscale value Pz, a luminance component IPc corresponding to the grayscale compensation value Pc, and a luminance component IPzc corresponding to the compensated grayscale value Pzc. to be. In FIG. 7, it can be seen that IPz represents the luminance distribution characteristic of the captured image which has not been subjected to the compensation process, and IPzc represents the luminance distribution characteristic of the compensated captured image.

If the gray value Pz of each pixel is output to the display panel 470 without being compensated, the captured image having the luminance I distribution characteristic inversely proportional to the pixel distance L as shown in IPz in FIG. 7. image) will be played. However, if the gradation value Pz of each pixel is compensated for and the compensated gradation value Pzc is output to the display panel 470, regardless of the pixel distance L as shown in IPzc in FIG. A compensated captured image with equal luminance (I) distribution characteristics will be reproduced. When the gray scale compensation value Pc is determined by the compensation value provider 562, the gray scale compensation such that the compensated captured image has a uniform luminance I distribution characteristic regardless of the pixel distance L. The value Pc must be determined.

In FIG. 4, the display panel 470 receives a compensated gray value Pzc and displays a compensated captured image. If the display panel 470 directly receives the gray value Pz of each pixel from the reproduction controller 450 in FIG. 4, a capture image having an uneven luminance distribution characteristic may be reproduced. However, the captured image reproducing apparatus according to the present invention includes a compensator 460, and the compensator 460 displays the compensated gray value Pzc by receiving the gray value Pz of each pixel from the reproduction controller 450. By outputting to the panel 470, the display panel 470 reproduces a compensated captured image having an uniform luminance distribution.

The invention may be understood in terms of method invention as follows. That is, the captured image reproduction method according to the present invention includes the following process.

First, a screen image of an image projection system is captured to generate image data DATA. A screening device such as a camcorder is used to capture a screen image and generate image data DATA corresponding to the captured image.

Then, the gradation value Pz of each pixel is calculated from the image data DATA. Then, the pixel distance L from the center pixel to each pixel is calculated.

Then, a gradation compensating value Pc corresponding to the pixel distance L is provided. Here, the gray level compensation value Pc is determined in consideration of the luminance distribution in the screen image or the captured image. For example, in the screen image, when the pixel closer to the center pixel is higher in brightness and the pixel farther from the center pixel is lower in brightness, the shorter the pixel distance L is, the smaller the gray level compensation value Pc is and the pixel distance L is smaller. The longer is), the larger the gray level compensation value Pc is. That is, the gray level compensation value Pc is determined such that the compensated captured image has an equal luminance distribution.

The gradation value Pz of each pixel is summed with the gradation compensation value Pc of each pixel to generate a compensated gradation value Pzc of each pixel. The compensated capture image corresponding to the compensated gray value Pzc is displayed.

In the above described the present invention with reference to the specific embodiment shown in the drawings, but this is only an example, those of ordinary skill in the art to which the present invention pertains various modifications and variations therefrom. Therefore, the protection scope of the present invention should be interpreted by the claims to be described later, and all the technical ideas within the equivalent and equivalent ranges should be construed as being included in the protection scope of the present invention.

According to the present invention, when reproducing a captured image capturing a screen image in an image projection system, a compensated captured image having an uniform luminance distribution ( compensated capture image).

Claims (12)

Display a compensated capture image by receiving image data corresponding to the captured image from a photographing apparatus that captures a screen image in an image projection system In the capture video playback device, A playback controller for outputting a gradation value of each pixel calculated from the image data corresponding to the coordinates of each pixel; A compensator configured to receive the gray level value of each pixel and information about the coordinates of each pixel to generate a compensated gradation value; And And a display panel configured to receive the compensated grayscale value and display the compensated captured image. The compensator, A distance calculator for calculating a pixel distance from a center pixel to each pixel based on the information about the coordinates of each pixel; A compensation value provider for providing a gradation compensating value corresponding to the pixel distance; And A calculator for generating the compensated gradation value by summing the gradation value and the gradation compensation value; Captured image reproducing apparatus comprising a. The method of claim 1, The compensation value provider, And the gray level compensation value is determined in consideration of the luminance distribution in the screen image. The method of claim 2, In the screen image, when the pixel closer to the center pixel is higher in luminance, and the pixel farther from the center pixel is lower in luminance, The compensation value provider, And determining the gradation compensation value such that the compensated captured image has an equal luminance distribution. The method of claim 3, wherein The compensation value provider, The shorter the pixel distance, the smaller gray level compensation value is provided. The longer the pixel distance, the larger gray level compensation value is provided. The method of claim 1, The compensation value provider, And a look up table (LUT) storing respective gray level compensation values corresponding to respective pixel distances. The method of claim 1, The calculator, Generating the compensated gradation value of each pixel by summing the gradation value of each pixel input from the reproduction control unit and the gradation compensation value of each pixel provided from the compensation value provider, And outputting the compensated gray value of each pixel to the display panel in correspondence with the coordinates of each pixel. The method of claim 1, The playback control unit, A decoder for decoding the encoded image data; A memory for storing decoded video data; And A controller configured to output a gray level value of each pixel calculated from the decoded image data corresponding to coordinates of each pixel; Captured image reproducing apparatus comprising a. The method of claim 1, The photographing apparatus, Captured image playback device characterized in that the mobile communication terminal, digital camera, video camera or camcorder (camcorder) equipped with an image sensor. Capturing a screen image in an image projection system to generate image data; Calculating a gradation value of each pixel from the image data; Calculating a pixel distance from the center pixel to each pixel; Providing a gradation compensating value corresponding to the pixel distance; Generating a compensated gradation value by adding the gradation value and the gradation compensation value; And Displaying a compensated capture image corresponding to the compensated gradation value; Captured image playback method comprising the. The method of claim 9, The gray level compensation value is determined in consideration of the luminance distribution in the screen image. The method of claim 10, In the screen image, when the pixel closer to the center pixel is higher in luminance, and the pixel farther from the center pixel is lower in luminance, The shorter the pixel distance is, the smaller the gray level compensation value is. The greater the pixel distance, the greater the gray level compensation value. The method of claim 11, And determining the gray level compensation value such that the compensated captured image has an uniform luminance distribution.
KR1020070030042A 2007-03-27 2007-03-27 Apparatus and method for playing-back captured image KR20080087585A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9686517B2 (en) 2014-12-15 2017-06-20 Test Research, Inc. Optical system and image compensating method of optical apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9686517B2 (en) 2014-12-15 2017-06-20 Test Research, Inc. Optical system and image compensating method of optical apparatus

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