KR20060054973A - Apparatus for analysing three dimensional image - Google Patents

Abstract

Disclosed is a three-dimensional image analysis apparatus capable of evaluating the image quality of a three-dimensional image reproduced by a three-dimensional display in real time.

The disclosed three-dimensional image analysis apparatus includes a screen on which a three-dimensional test pattern provided in a three-dimensional display is formed; A detector for detecting the intensity and color information of the image from the image formed on the screen; An optical unit disposed between the screen and the detector to filter and transfer an image formed on the screen to the detector; An adjusting unit for adjusting the focus position of the screen, the detector and the optical unit; An input unit which first processes and stores a signal detected by the detector; And an analyzing unit analyzing the image quality in real time from the signal stored in the input unit.

Description

Apparatus for analysing three dimensional image}

1 is a schematic view showing a three-dimensional image analysis device according to a first embodiment of the present invention.

2a to 2c each show a three-dimensional test pattern.

Figure 3 is a schematic diagram showing the operating principle of a two-view three-dimensional display.

4A is a view showing a condensed image observed when both a left eye signal and a right eye signal are input.

4B is a view illustrating an image observed when only a left eye signal is input.

4C is a view illustrating an image observed when only a right eye signal is input.

5A to 5C are graphs showing changes in the left eye image according to the viewing distance change.

6A and 6B are graphs showing viewing degrees of freedom for each of the ideal case and the actual case.

7 is a graph showing the horizontal intensity distribution of the left eye image formed on the screen.

8 shows a viewing angle and viewing area;

9A to 9C are graphs showing changes in viewing freedom distribution of the left eye image observed on the screen according to the viewing distance change.

10 is a schematic view showing a three-dimensional image analysis device according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10, 210 ... display 20, 220 ... detector

21 ... screen 23, 223 ... V (λ) filter

24 ... imaging lens 25, 221 ... optical unit

30, 230 ... detectors 40, 240 ... adjustment units

50, 250 ... Input 60, 260 ... Analysis

223 ... cut-off lens 225 ... aperture stop

227 relay lens

The present invention relates to a three-dimensional image analysis apparatus, and more particularly, to a three-dimensional image analysis apparatus that is able to evaluate the real-time quality of the three-dimensional image reproduced by the three-dimensional display.

In response to the practical use of 3D video broadcasting, 3D video broadcasting and 3D display standard standards are actively proposed.

In watching the image of the same resolution, the viewer feels the visual quality deterioration greatly when watching the 2D image when watching the 3D image. When a 3D image is provided, a stereoscopic image is provided using horizontal parallax and vertical parallax. Basically, the image quality felt by the viewer is only 1/2 or 1/4 of the two-dimensional image.

Accordingly, in order to activate 3D video broadcasting, standardization of an image quality evaluation apparatus and method corresponding to various 3D displays is required.

Accordingly, an object of the present invention is to provide a three-dimensional image analysis apparatus that is designed to meet the above-described requirements, and is capable of performing a close visual evaluation in real time.

In order to achieve the above object, a three-dimensional image analysis device according to the present invention, the screen is formed by the three-dimensional test pattern provided in the three-dimensional display; A detector for detecting the intensity and color information of the image from the image formed on the screen; An optical unit disposed between the screen and the detector, for filtering an image formed on the screen and transmitting the filtered image to the detector; An adjusting unit for adjusting a focus position of the screen, the detector, and the optical unit; An input unit which first processes and stores a signal detected by the detector; And an analyzing unit analyzing the image quality in real time from the signal stored in the input unit.

The present invention also provides a detector for detecting intensity and color information of an image from a three-dimensional test pattern provided in a three-dimensional display; An optical unit disposed between the three-dimensional display and the detector to filter and block an image formed on a viewing plane and transmit the filtered image to the detector; An adjusting unit for adjusting a focus position of the detector and the optical unit; An input unit which first processes and stores a signal detected by the detector; And an analyzing unit analyzing the image quality in real time from the signal stored in the input unit.

Hereinafter, an apparatus for analyzing a 3D image according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the apparatus for analyzing a 3D image according to the first embodiment of the present invention includes a detector 20 for detecting a 3D test pattern image provided from a 3D display 10, and a focus of the detector 20. An adjustment unit 40 for adjusting a position, an input unit 50 for receiving a signal detected by the detection unit 20 and processing the primary, and an analysis unit 60 for analyzing image quality in real time. In this case, the detector 20 includes a screen 21 on which a 3D test pattern provided by the display 10 is formed, an optical unit 25, and a detector 30 that detects intensity and color information of a 3D image. It includes.

The display 10 is a device for providing a 3D image formed on the screen 21 or free space, and provides a 3D test pattern image when performing an analysis according to the present invention. This three-dimensional test pattern has various forms depending on the format of the 3D display. 2A to 2C each show a three-dimensional test pattern.

FIG. 2A illustrates a two-view horizontal X horizontal 3D display format in which a signal for a first view and a signal for a second view are arranged horizontally, and FIG. View vertical x vertical 3D display format. 2C shows an 8-view tilt barrier 3D display format in which red, green, and blue subpixels are arranged in sequence. In this case, for a test pattern for reproducing only an image corresponding to the primary view, a signal may be input only to a horizontal, vertical, or subpixel corresponding to the primary view.

The screen 21 is a surface on which the three-dimensional test pattern provided on the display 10 is formed and is spaced apart from the display 10 by a predetermined distance.

The optical unit 25 is disposed on the screen 21 and the detector 30, and filters the image formed on the screen 21, and transmits the filtered image to the detector 30. . To this end, the optical unit 25 includes a V (λ) filter 23 and an imaging lens 24. The V (λ) filter 23 is a filter that changes the sensitivity of each wavelength of an image to human visibility. In this way, when the V (λ) filter 23 having the visibility characteristics of human is adopted, it is possible to evaluate a video signal close to the naked eye. Here, since the configuration of the V (λ) filter 23 itself is widely known, a detailed description thereof will be omitted. The imaging lens 24 is disposed between the V (λ) filter 23 and the detector 30 so that an image passing through the V (λ) filter 23 is received by the detector 30. do.

The detector 30 is formed of a detection device such as a charge coupled device (CCD), a CMOS, a PM-tube, or the like, in which each image pickup device has a two-dimensional array, and a three-dimensional image formed on the screen 21. The intensity and color information of the image is detected from the information. The detector 30 is spaced apart from the screen 21 by a viewing distance d _v .

The adjustment unit 40 independently of the detection unit 30 or the screen 21, the optical unit 25, and the detector 30 constituting the detection unit 30 independently three axes (Y, Z axis in the drawing) And X-axis) driving and / or rotational driving perpendicular to each of the Y-axis and the Z-axis. In particular, the adjustment unit 40 variably adjusts the detection unit 30 including the screen 21 to adjust the distance between the display 10 and the screen 21. To this end, the adjustment unit 40 may be composed of a stepping motor device, etc., the structure itself is well known, so a detailed description thereof will be omitted.

The input unit 50 primarily processes and stores the signal detected by the detector 30. To this end, the input unit 50 includes a frame grabber 51 for capturing one frame of the input image signal, an analog-to-digital converter (ADC) 53 for digitizing the captured frame video signal, A buffer memory 55 for storing the converted signal is included.

The analyzer 60 receives a signal stored in the input unit 50 and analyzes the image quality in real time. That is, the analysis unit 60 may contrast, brightness, uniformity, color gamut, cross talk, viewing freedom, and viewing freedom from an input signal. A viewing zone, a viewing angle, and a viewing distance are calculated and displayed in a graphical user interface mode. Hereinafter, the viewing distance, the crosstalk, the viewing freedom, the viewing area, and the viewing angle will be described in detail.

3 is a schematic diagram showing an operation principle of a barrier type two-view three-dimensional display. Here, the 3D test pattern provided on the display 110 is distinguished by the barrier 120 into a left eye and a right eye 2 viewpoints. In this case, as shown in FIG. 2B, the left eye signal and the right eye signal input vertically x vertically pass through the barrier 120 partially, and then enter the left and right eyes of the observer located at the viewing distance, respectively.

At this time, the left eye and right eye signals are as shown in FIGS. 4A to 4C. That is, FIG. 4A illustrates an image observed when both the left eye signal and the right eye signal are input. At this time, the signal in which the mark 115 is located among the blurred images is the left eye signal. FIG. 4B illustrates an image observed when only the left eye signal is input, and FIG. 4C illustrates an image observed when only the right eye signal is input. Here, the distance between the center of the left eye signal and the center of the right eye signal is 65 mm, which is a standard distance between eyes.

5A to 5C are graphs illustrating changes in the left eye image according to a change in viewing distance. 5A shows a case in which the screen is moved toward the display at the negative defocused state, that is, the optimum viewing distance. 5B shows a left eye image at (0) defocused state, that is, an optimal viewing distance. 5C illustrates a case in which the screen 21 in FIG. 1 is moved away from the display 10 in the optimal viewing distance, that is, in a positive defocused state. Compared with each other, the width of the left eye image becomes smaller in the case of (-) defocus compared to the (0) defocused state, and the width of the left eye image increases in the case of (+) defocus. . As described above, the degree of defocus can be known from the change in the width of the left eye image (or the right eye image), and the optimal viewing distance can be calculated.

6A and 6B are graphs showing viewing degrees of freedom for each of the ideal case and the actual case.

Referring to FIG. 6A, when the 3D display is ideal, the intensity distribution of the left eye image observed at the optimal viewing distance when the left eye signal is input is represented by a square function. In this case, the left eye signal does not exist at all in the right eye image point (part shown by dashed line).

On the other hand, as shown in FIG. 6B, the left eye image observed at the optimal viewing distance has a wider width and an intensity distribution with blurred edges. Therefore, a considerable amount of left eye signal is present at the right eye image point. This acts as a noise to the right eye image, thereby reducing the signal-to-noise ratio (SNR), which relatively reduces the right-eye viewing freedom. Here, the viewing degree of freedom is determined by the distance between the screen positions after setting the threshold SNR for recognizing the 3D image. That is, the viewing degree of freedom may be calculated in the following order. Set the threshold SNR and input the test left eye signal to the display. The intensity distribution of the left eye image from the center of the screen to the horizontal direction is measured (left eye crosstalk is measured). Subsequently, a test right eye signal is input to the display and the intensity distribution of the right eye image is measured (right eye signal measurement) in the same manner as the intensity distribution measurement of the left eye image. The SNR is then calculated by the ratio of the measured right eye signal and left eye cross talk. By calculating the screen position difference based on the calculated SNR, the viewing degree of freedom can be calculated.

Crosstalk is calculated by inputting a test left eye signal to the display and the intensity value of the left eye image measured at the right eye image point. In this case, it is also possible to calculate by inputting the right eye signal instead of the left eye signal and measuring the intensity value of the right eye image at the left eye image point.

7 is a graph illustrating a horizontal intensity distribution of a left eye image formed on a screen. In the figure, the solid line is the intensity distribution of the left eye image observed on the screen, and the dotted line is the intensity distribution of the right eye image. Looking at the figure, it can be seen that the intensity of the image decreases while the intensity of the crosstalk increases as the edge is moved from the center of the screen.

8 is a diagram illustrating a viewing angle and a viewing area. The viewing area shown can be measured from the intensity distribution of the test pattern at the optimum viewing distance.

The viewing angle θ may be calculated from Equation 1 using the measured viewing area and viewing distance.

 9A to 9C are graphs showing changes in viewing freedom distribution of the left eye image observed on the screen according to the viewing distance change.

FIG. 9A illustrates a case in which the screen () moves toward the display at the negative defocused state, that is, the optimum viewing distance, and FIG. 9B illustrates a left eye image at the (0) defocused state, that is, the optimum viewing distance. It is shown. 9C illustrates a case where the screen is moved away from the display at the positive defocused state, that is, the optimum viewing distance. Compared with each other, it can be seen that viewing freedom becomes smaller in both (-) defocused and (+) defocused cases compared to the (0) defocused state. From this, the tolerance of the viewing distance can be set, and the auto focus adjustment of the detector can be performed.

Tolerance setting sequence of viewing distance is as follows. First, threshold viewing degrees of freedom are set, and the intensity distribution of the left eye image on the screen is measured while moving the viewing distance in the negative defocus direction. At this time, the viewing distance having the threshold degree of freedom is set as the minimum viewing distance. The intensity distribution of the left eye image on the screen is then measured while moving the viewing distance in the positive defocus direction. At this time, the viewing distance having the threshold degrees of freedom is set as the maximum viewing distance. The difference between the maximum viewing distance and the minimum viewing distance set as described above becomes the tolerance of the viewing distance.

The auto focus adjustment procedure of the detector is as follows. First, the intensity distribution of the left eye image on the screen is measured while varying the viewing distance, and the viewing freedom is calculated. The focusing is completed by setting the viewing distance having the maximum viewing freedom as the optimum viewing distance and placing the screen at this setting position.

Referring to FIG. 10, the apparatus for analyzing a 3D image according to the second exemplary embodiment of the present invention may include a detector 220 that detects a 3D test pattern image provided by a 3D display 210, and a detector 220. An adjustment unit 240 for adjusting a focus position, an input unit 250 for receiving a signal detected by the detection unit 220 and processing the first, and an analysis unit 260 for analyzing image quality in real time.

The three-dimensional test pattern provided by the display 210 is formed in the viewing plane on the free space. The detector 220 includes an optical unit 221 and a detector 230 for detecting intensity and color information of a 3D image.

In comparison with the analysis apparatus according to the first embodiment, the three-dimensional image analyzing apparatus according to the present embodiment distinguishes the point that the 3D image is formed in the free space and the configuration of the optical unit 221 is changed. As such, the other configurations are substantially the same. Therefore, a description will be given focusing on the above-described differences, and description of substantially identical components will be omitted.

The optical unit 221 has a V (λ) filter 223, a cut-off lens 225, and an aperture stop 227 sequentially arranged on the display 210 side toward the detector 230. ) And relay lens 229. The V (λ) filter 223 is a filter that changes the sensitivity for each wavelength of an image to human visibility. In this way, when the V (λ) filter 223 having the visibility characteristics of human is employed, it is possible to evaluate a video signal close to the naked eye.

The cut-off lens 225 forms a center light of the light passing through the V (λ) filter 223, and the aperture stop 227 passes through the cut-off lens 225. Blocks ambient light in one light. The relay lens 229 forms an image passing through the aperture stop 227 on the detector 230.

The detector 230 may have a configuration in which each image pickup device has a one-dimensional array, in addition to a configuration in which each image pickup device has a two-dimensional array. In this case, since the detector 230 can detect only luminance information of a specific point, the intensity distribution is measured by moving the detector 230 in the vertical and horizontal directions on a plane perpendicular to the z-axis through the adjustment unit 240. can do.

Since the three-dimensional image analysis apparatus configured as described above can inspect the three-dimensional display in real time by using a one-dimensional or two-dimensional detector, the inspection time can be greatly shortened. In addition, when the analytical apparatus is attached to the production line and used, automation is possible and alignment of the optical plate can be easily performed.

In addition, since the optimal viewing area and the optimal viewing distance can be calculated by the quality inspection, the optimal viewing conditions of the 3D display can be presented. In addition, since a detector such as a V (λ) filter having a luminous characteristic and a CCD sensor is used, there is an advantage that the evaluation can be performed with the naked eye.

The above embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the invention described in the claims below.

Claims (6)

A screen on which a three-dimensional test pattern provided in the three-dimensional display is imaged; A detector for detecting the intensity and color information of the image from the image formed on the screen; An optical unit disposed between the screen and the detector, for filtering an image formed on the screen and transmitting the filtered image to the detector; An adjustment unit for adjusting a focus position of the screen, the detector and the optical unit; An input unit which first processes and stores a signal detected by the detector; And an analyzing unit analyzing the image quality in real time from the signal stored in the input unit. The method of claim 1, The optical unit, A V (λ) filter for converting the sensitivity of the image for each wavelength into a human visibility; And an imaging lens for imaging the light transmitted through the V (λ) filter to the detector. A detector for detecting intensity and color information of the image from the three-dimensional test pattern provided in the three-dimensional display; An optical unit disposed between the three-dimensional display and the detector, the optical unit filtering and blocking an image formed on a viewing plane and transmitting the filtered image to the detector; An adjusting unit for adjusting a focus position of the detector and the optical unit; An input unit which first processes and stores a signal detected by the detector; And an analyzing unit analyzing the image quality in real time from the signal stored in the input unit. The method of claim 3, The optical unit, A V (λ) filter for converting the sensitivity of the image for each wavelength into a human visibility; A cut-off lens for forming a center light of the light passing through the V (λ) filter; An aperture stop for blocking ambient light of the light passing through the cut-off lens; And a relay lens for imaging the image passing through the aperture stop on the detector. The method according to any one of claims 1 to 4, The input unit, A frame grabber for capturing one frame of the input video signal; And a buffer memory for digitizing the captured frame video signal and storing the captured frame video signal. The method according to any one of claims 1 to 4, The analysis unit, And contrast, luminance, uniformity, color gamut, crosstalk, viewing freedom, viewing area, viewing angle, and viewing distance, and displaying the same in the graphical user interface mode.

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