JP5700998B2 - 3D image display apparatus and control method thereof - Google Patents

Description

  The present invention relates to a stereoscopic video display device that displays stereoscopic video content and a control method thereof.

  There are two types of stereoscopic video display methods using binocular parallax: a time division method in which two images are alternately viewed by time division and a polarization division method in which two images having different polarizations are simultaneously viewed. There are two methods for photographing and producing stereoscopically viewable video content. The first method is a method (a generation method corresponding to polarization splitting) in which images for left and right eyes are photographed and produced at the same timing. The second method is a method of shooting and producing at alternate timings (shooting and production methods corresponding to the time division method) assuming that the time-division method is used.

  If the shooting and production method of stereoscopic video content does not correspond to the display method when displaying the stereoscopic video content, stereoscopic video, especially video with motion, does not appear to move smoothly, and the quality May feel low.

  FIG. 9 is a diagram illustrating the relationship between the display of stereoscopic video content and time when a left-eye video and a right-eye video are simultaneously captured during shooting and are alternately displayed during display. When shooting right-eye video and left-eye video simultaneously, such as when recording two cameras in synchronization, the left-eye video at the time of shooting on the time axis is 111, 112, 113, and right-eye video. Becomes 121, 122, 123. On the other hand, in the case of displaying on a stereoscopic video display apparatus that displays a stereoscopic video alternately left and right, 131, 132, and 133 for the left eye and 141, 142, and 143 for the right eye when displayed on the time axis. become that way.

  If the right-eye image 121 captured at the same time as the left-eye image 111 at the time of shooting is displayed as it is at the timing of 141 at the time of display, the timing differs at the time of shooting and at the time of display, and it does not appear to move smoothly. , May feel low grade.

  2. Description of the Related Art Conventionally, there is a video that is interpolated, adjusted, and displayed based on information indicating a shooting and production method assigned to video content (see, for example, Patent Document 1). FIG. 10 is a diagram illustrating the relationship between the adjustment and display of stereoscopic video content and the time in the prior art in the case where the left-eye video and the right-eye video are simultaneously shot when shooting and are alternately displayed during display. Similarly to FIG. 9, when right-eye video and left-eye video are simultaneously captured, the left-eye video 211, 212, and 213 and the right-eye video 221, 222, and 223 at the time of shooting with respect to the time axis. become that way. Further, the left-eye video at the time of display is 231, 232, 233, and the right-eye video is 241, 242, 243. By displaying the video displayed at the timing 241 after adjusting the interpolation, synthesis, etc. from the video captured at the timing 221 and 222, the difference between the timing of the imaging and the display is reduced. High-quality display can be performed.

  FIG. 11 is a diagram showing the relationship between the adjustment and display of stereoscopic video content and the time in the prior art when the left-eye video and the right-eye video are alternately switched during shooting and are displayed simultaneously during display. Similar to the case shown in FIG. 10, since images taken alternately may be displayed at the same time when the images are displayed simultaneously, the images are conventionally displayed by adjusting interpolation, synthesis, etc. from the previous and next video frames. It was.

JP 2008-252731 A

  However, depending on the device used and the video format, there is a case where information indicating a method for shooting and producing the left-eye video and the right-eye video is not added to the video content. In addition, information indicating the method for shooting and production of the left-eye video and the right-eye video may become unknown during the process of editing the stereoscopic video content or network distribution, or may be provided with different information. . If information indicating a method for shooting and producing a left-eye video and a right-eye video is not given to the video content, the stereoscopic video content may not be appropriately adjusted and displayed.

  Accordingly, the present invention provides a stereoscopic video display apparatus capable of discriminating a method of shooting and production from a video of stereoscopic video content, thereby appropriately adjusting and displaying the stereoscopic video content and displaying a high-quality stereoscopic video. An object is to provide a control method thereof.

According to one aspect of the present invention, there is provided a stereoscopic video display device that displays a stereoscopic video by alternately displaying a left-eye image and a right-eye image having binocular parallax in a time-sharing manner, Based on a plurality of left-eye images and right-eye images, each pair of left-eye images and right-eye images is taken at the same time, or alternately taken at a predetermined time difference. If the determination means determines that the pair of left-eye images and right-eye images are taken at the same time, either the left-eye image or the right-eye image with sequentially generating image composed of a plurality of frames for one, the other image and have a display control means for displaying alternately, said determining means, the left and right eye images over the plurality of frames By comparing each brightness change Or left and right eye images of each pair is one that was captured at the same time, the stereoscopic image display apparatus characterized by determining whether it was taken alternately at predetermined time difference is provided The

  According to the present invention, it is possible to discriminate a method at the time of shooting and production from a video of stereoscopic video content, thereby appropriately adjusting and displaying the stereoscopic video content and displaying a high-quality stereoscopic video.

The block diagram showing the structure of the three-dimensional-video display apparatus in embodiment. 6 is a flowchart illustrating processing performed by an imaging method determination unit according to the embodiment. The figure which shows the example of the brightness | luminance for determination in embodiment. The figure which shows the example of the image | video for determination in embodiment. The flowchart which shows the process by the video processing part in embodiment. 6 is a flowchart illustrating processing for switching the number of video frames to be displayed by the video processing unit according to the embodiment. The figure showing the relationship between the switching of the number of display video frames of the video processing unit and time in the embodiment. 6 is a flowchart illustrating processing performed by an imaging method determination unit according to the embodiment. The figure showing the relationship between the imaging | photography timing of 3D video content, and a display timing. The figure showing the relationship between the adjustment and display, and time of the three-dimensional video content image | photographed simultaneously right and left in a prior art. The figure showing the relationship between the adjustment and display, and time of the stereoscopic video content which carried out the left-right alternating photography in a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment, It shows only the specific example advantageous for implementation of this invention. Moreover, not all combinations of features described in the following embodiments are indispensable for solving the problems of the present invention.

[Embodiment 1]
In the first embodiment of the present invention, a description will be given of a stereoscopic video display device that compares the positions of objects that move in the vertical direction to determine the method of shooting and production.

  FIG. 1 is a block diagram illustrating a configuration of a stereoscopic video display device according to the present embodiment. The stereoscopic video display device 1 reproduces and displays the video data 2. The stereoscopic image display device 1 alternately displays right-eye and left-eye images having binocular parallax in a time-division manner in order to view stereoscopic images. Video data 2 is video data having a pair of left-eye video and right-eye video. The video data 2 is compressed and encoded, for example, and is input as data having a predetermined frame rate from an optical disk device or a network.

  The glasses 3 are for viewing a stereoscopic image, and include a liquid crystal shutter that receives a signal from the image switching instruction unit 50 and blocks an image reaching the right eye and the left eye. The video data input unit 10 reads stereoscopic video data included in the video data 2 and separates it into right-eye and left-eye video data. The right-eye video data decoding unit 20 and the left-eye video data decoding unit 30 respectively. Output to.

  The right-eye video data decoding unit 20 and the left-eye video data decoding unit 30 have the same function only depending on whether the video data to be processed is for the right eye or the left eye, and are input from the video data input unit 10. The video data is decoded to generate a right-eye video and a left-eye video. In addition, the motion vector, which is data representing the motion of the video in the specific area used at the time of decoding the video data, the video in the specific area, the luminance change, and the like are passed to the imaging method determination unit 70. As the motion vector representing the motion of the video, not only the motion vector included in the video data but also the data representing the motion corresponding to the motion vector may be generated by comparing the image frames before and after the generated video.

  The video processing unit 40 as display control means determines display type information indicating whether to display a right-eye video or a left-eye video according to a specific cycle, and outputs the video to be displayed to the video display unit 60. . In order to alternately display the two images of the right-eye image and the left-eye image, the two images of the right-eye image and the left-eye image are usually displayed at twice the speed at the time of shooting.

  The video processing unit 40 also displays a plurality of videos for the right-eye video or the left-eye video instead of directly displaying either the right-eye video or the left-eye video based on the information from the imaging method determination unit 70. Generate and display the synthesized video from the frame. For synthesizing video from a plurality of video frames, for example, based on the magnitude and direction of the motion of an object in the video, processing is performed such as synthesizing a video with the object at a position in the middle of the motion.

  The video processing unit 40 also increases the number of video frames to be displayed by shortening the cycle for displaying the right-eye video and the left-eye video based on the information from the imaging method determination unit 70 and increasing the display speed. Display video.

  The video switching instruction unit 50 transmits a signal indicating whether the right-eye video and the left-eye video are blocked by the glasses 3 based on the display type information determined by the video processing unit 40 to be invisible. The video display unit 60 displays the video delivered from the video processing unit 40, and is configured by a liquid crystal panel or the like.

  The imaging method determination unit 70 receives a plurality of frames of left-eye video and right-eye video from the right-eye video data decoding unit 20 and the left-eye video data decoding unit 30. The imaging method determination unit 70 determines whether each pair of left-eye video and right-eye video is simultaneously shot based on the received multiple-frame left-eye video and right-eye video. It is determined whether or not the images were taken alternately. In the following description, a pair of left-eye video and right-eye video that are simultaneously captured may be abbreviated as “simultaneous left and right”. In addition, a pair of left-eye video and right-eye video captured alternately with a predetermined time difference may be abbreviated as “left-right alternating”.

  FIG. 2 is a flowchart showing processing by the photographing method determination unit 70 in the present embodiment. The imaging method determination unit 70 includes, from the left-eye video data decoding unit 30, the motion vector value, the position of the region, and the left-eye video of the region including the region with respect to the region where the motion vector is upward or downward. The left-eye determination video information, which is information, is acquired (S210). Next, the imaging method determination unit 70 acquires right-eye determination video information as information on a region corresponding to the left-eye determination video information from the right-eye video data decoding unit 20 (S220).

In the present embodiment, for example, a region that satisfies the following conditions (1) to (3) is detected as a region corresponding to the left-eye determination video information.
(1) The range on the display screen in the right direction up to 65 mm (a general interval between both eyes of a person) on the basis of the position of the region represented by the left-eye determination video information.
(2) A specific range in which the range in the vertical direction is equal to or greater than the value of the motion vector with reference to the position of the region represented by the left-eye determination video information.
(3) A region having substantially the same motion vector as the motion vector included in the left-eye determination video information.

  In S220, a region satisfying all the above conditions (1) to (3) is detected, and right-eye determination video information relating to the region is acquired. In the above (2), the detection range condition includes a general human eye distance (65 mm), which is a parallax value that can be three-dimensionally recognized as an object at infinity. If the maximum parallax value of the video to be displayed is known in advance, that value may be used.

  Next, the imaging method determination unit 70 compares the left-eye determination video information and the right-eye determination video information (S230). As a result of the comparison, if the vertical positions of the regions pointing to the same object in each video are substantially the same, the process proceeds to S250, and otherwise the process proceeds to S260.

  In S250, the shooting method determination unit 70 determines that the shooting method is a shooting method in which left and right timing is the same (shooting method corresponding to the polarization division method), and notifies the video processing unit 40 of the determination result. . The video processing unit 40 generates a video synthesized from a plurality of video frames for either the right-eye video or the left-eye video when the timing at the time of shooting is the left and right simultaneously (shooting method corresponding to the polarization splitting method). To display.

  In S <b> 260, the shooting method determination unit 70 determines that the shooting method is a shooting method whose shooting timing is alternated between right and left (shooting method corresponding to the time division method), and notifies the video processing unit 40 of the determination result. The video processing unit 40 displays the right-eye video and the left-eye video as they are without generating a video when the timing at the time of shooting is alternate between left and right (shooting method corresponding to the time division method).

  FIG. 4 shows an example of the determination video. The left-eye video L is a video that changes temporally in the order of L1, L2, and L3. It is assumed that the circular object 410 included in the left-eye video L has moved downward by 2 units. A range 411 is a range of a region that satisfies the above conditions (1) to (3) with the circular object 410 as a reference in the video L for the left eye. The range 411 is based on the circular object 410, up to 65 mm in the size on the screen in the right direction, up to 120 mm in the size on the screen in the left direction, and up to 2 units that are motion vector values representing the movement of the circular object 410 in the vertical direction. Range.

The right-eye video RP is a video that is simultaneously captured in synchronization with the left-eye video L, and is a video that changes temporally in the order of RP1, RP2, and RP3. The shooting method determination unit 70 sets a circular object 420 having the same motion vector as that of the circular object 410 from the range 421 in the right-eye video RP corresponding to the range 411 as an area corresponding to the circular object 410 of the left-eye video L. Get the containing area. The shooting method determination unit 70 compares the position of the object in the vertical direction from the image of the area including the circular object 410 and the circular object 420. At this time, since the vertically moving positions of the objects moving downward are substantially the same, it is determined that the left-eye video L and the right-eye video RP are taken at the same time on the left and right.
In the example described above, the relationship between the left-eye video and the right-eye video may be reversed.

  The right-eye video RS is a video that is alternately captured with the left-eye video L, and is a video that changes in the order of RS1, RS2, and RS3 in time. The imaging method determination unit 70 selects a circular object 430 having the same motion vector as that of the circular object 410 from the range 431 in the right-eye video RS corresponding to the range 411 as an area corresponding to the circular object 410 of the left-eye video L. Get the containing area. The shooting method determination unit 70 compares the vertical position of the object from the image of the area including the circular object 410 and the circular object 430. At this time, since the positions in the vertical direction are different, it is determined that the left-eye video L and the right-eye video RS are captured alternately on the left and right.

  FIG. 5 is a flowchart showing the processing of the video processing unit 40 in the present embodiment. First, the video processing unit 40 acquires information indicating the shooting method notified by the shooting method determination unit 70 (S510). Next, the video processing unit 40 determines whether or not the timing at the time of shooting is the same at the left and right (shooting method corresponding to the polarization splitting method) (S540). Here, in the case of simultaneous left and right, the process proceeds to S550, and in other cases, the process proceeds to S560.

  In S550, the video processing unit 40 sequentially generates a video synthesized from a plurality of video frames for either the right-eye video or the left-eye video, and alternately displays the video with the other video. In S560, the video processing unit 40 does not generate a video and displays the right-eye video and the left-eye video as they are.

  As described above, according to the present embodiment, it is determined whether the timing at the time of shooting a stereoscopic image is the left and right at the same time (shooting method corresponding to the polarization division method) or the left and right alternate (shooting method corresponding to the time division method). can do. Then, it is possible to display the right-eye video and the left-eye video of the stereoscopic video according to the determination result.

  Note that, when the stereoscopic video display device is a device that displays images for the left and right eyes simultaneously, the operation performed based on the determination result of the imaging method determination unit 70 is reversed. That is, when it is determined that the left and right images are the same, the right-eye video and the left-eye video are displayed as they are. When it is determined that the left and right are alternate, either the right-eye video or the left-eye video is synthesized from a plurality of video frames. Generate and display the video.

  In S550 and S560, the video processing unit 40 performs processing to determine whether or not to generate a video based on information indicating the shooting method. However, the number of video frames to be displayed may be switched. That is, in a stereoscopic video display device that displays stereoscopic video alternately in left and right in a time-sharing manner, if the timing at the time of shooting is alternating left and right (shooting method corresponding to the time-division method), the number of video frames of the video content is not increased, Two video frames are displayed on the left and right at twice the speed of shooting.

  If it is determined that the timing at the time of shooting is simultaneous left and right (shooting method corresponding to the polarization splitting method), the number of video frames to be displayed is increased, and two video frames are displayed on the left and right images as 4, 6,. Display at double speed.

  FIG. 6 is a flowchart showing processing for switching the number of video frames to be displayed, which is executed by the video processing unit 40 in the present embodiment. S610, S640, and S660 represent the same processes as S510, S540, and step S560 of FIG. 5, respectively. In S650, the video processing unit 40 performs display by increasing the number of display video frames. That is, when it is determined that the video for the left eye and the video for the right eye are captured at the same time, the video processing unit 40 is N times the normal frame rate (N is a natural number of 2 or more). The left-eye video and the right-eye video of each input frame are alternately displayed at the frame rate.

  FIG. 7 is a diagram illustrating processing when it is determined that the timing at the time of shooting is the left and right at the same time (shooting method corresponding to the polarization division method) in a stereoscopic image display device that alternately displays left and right stereoscopic images in a time division manner. is there. Specifically, the figure shows the relationship between video and time when the number of video frames to be displayed is tripled and displayed at 6x speed. When the right-eye video and the left-eye video are simultaneously shot, the left-eye video at the time of shooting with respect to the time axis is 711, 712, 713, and the right-eye video is 721, 722, 723.

  If it is determined by the shooting method determination unit 70 that the left and right images have been shot simultaneously, the video processing unit 40 triples the number of video frames to be displayed. That is, the left-eye image 711 at the time of shooting is displayed as the left-eye image for display at the timings 731, 732, and 733. The right-eye video 721 at the time of shooting is displayed as the right-eye video for display at timings 741, 742, and 743. In this way, in a stereoscopic video display device that alternately displays left and right, by increasing the frame rate of the video to be displayed, the video can be displayed at a timing close to the left and right simultaneously.

[Embodiment 2]
In the second embodiment of the present invention, a stereoscopic video display device that uses a video whose brightness changes due to fade-in or the like to determine a method for shooting and production will be described. The configuration of the stereoscopic video display device in the present embodiment is the same as that in the first embodiment (FIG. 1).

  FIG. 8 is a flowchart showing processing by the photographing method determination unit 70 in the present embodiment. First, the imaging method determination unit 70 receives information from the left-eye video data decoding unit 30 that includes the position of the area where the luminance changes, the amount of luminance change, and the average luminance of the area where the luminance changes. Eye luminance change information is acquired (S810). The presence or absence of luminance change and the amount of luminance change are described in video encoding technology H.264. A weighting factor for weighted prediction in H.264 / AVC (Advanced Video Coding) may be used. If the luminance changes over the entire screen, the luminance change information for the left eye may be simply used as the average luminance of the entire screen.

Next, the imaging method determination unit 70 acquires right-eye luminance change information as information on a region corresponding to the left-eye luminance change information from the right-eye video data decoding unit 20 (S820). The conditions of the area corresponding to the left eye luminance change information are, for example, as follows.
(1) A range up to 65 mm (a general interval between both eyes of a person) in the size on the display screen in the right direction on the basis of the position of the region represented by the left eye luminance change information.
(2) An area having a luminance change amount substantially the same as the luminance change amount included in the left eye luminance change information.

  Note that when the luminance change information for the left eye is the average luminance of the entire screen, the luminance change information for the right eye may be the average luminance of the entire screen of the right eye image regardless of the above conditions.

  Next, the imaging method determination unit 70 compares the average luminance of the left-eye luminance change information and the right-eye luminance change information (S830). In S840, when the average luminance of the left-eye luminance change information and the right-eye luminance change information is substantially the same, the process proceeds to S850, and otherwise, the process proceeds to S860. S850 and S860 represent the same processes as S250 and S260 of FIG. 2, respectively.

  FIG. 3 shows an example of the determination brightness in this embodiment. The left-eye luminance BL represents the average luminance of the entire screen in the left-eye video, and temporally changes in the order of BL1, BL2, and BL3. The average brightness values of BL1, BL2, and BL3 are 2, 4, and 6, respectively, and the image is brightened by 2 units. The right-eye luminance BRP represents the average luminance of the entire screen of the video captured in synchronization with the left-eye video, and temporally changes in the order of BRP1, BRP2, and BRP3, and corresponds to BL1, BL2, and BL3, respectively. The average luminance values at BRP1, BRP2, and BRP3 are 2, 4, and 6, respectively, and the image becomes brighter by two units as with the left-eye luminance BL. The average luminances of two corresponding images such as BL1 and BRP1 are compared, and since both average luminances are approximately the same at 2, it is determined that the images are taken simultaneously at the left and right.

  The right-eye luminance BRS represents the average luminance of the entire screen of the video alternately captured with the left-eye video, and temporally changes in the order of BRS1, BRS2, and BRS3, and corresponds to BL1, BL2, and BL3, respectively. The average luminance values at BRS1, BRS2, and BRS3 are 3, 5, and 7, respectively, and the image becomes brighter by two units as with the left-eye luminance BL. The average luminances of two corresponding videos such as BL1 and BRS1 are compared, and since the average luminances are different between 2 and 3, it is determined that the video has been taken alternately left and right.

  As described above, according to the present embodiment, depending on whether or not the average luminance of the stereoscopic video to be faded in is the same, the timing at the time of shooting is the left and right simultaneously (shooting method corresponding to the polarization division method) or left and right alternately It is possible to determine whether it is a photographing method corresponding to the time division method. Based on the determination result, the right-eye video and the left-eye video of the stereoscopic video can be displayed.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed. In this case, the program and the storage medium storing the program constitute the present invention.

Claims (7)

A stereoscopic video display device that displays a stereoscopic video by alternately displaying a left-eye image and a right-eye image having binocular parallax in a time-sharing manner,
Based on the input left-eye image and right-eye image of a plurality of frames, each pair of left-eye image and right-eye image was taken at the same time, or alternately taken at a predetermined time difference. A determination means for determining whether or not
When it is determined by the determination means that each pair of left-eye images and right-eye images is taken at the same time, either the left-eye image or the right-eye image is synthesized from a plurality of frames. Display control means for sequentially generating images and alternately displaying the other images;
Have
Whether the determination means has taken the left eye image and the right eye image at the same time by comparing the luminance changes of the left eye image and the right eye image over the plurality of frames. A stereoscopic image display device for determining whether or not images are alternately photographed at a predetermined time difference.   The display control means is inputted without performing the synthesis when it is determined by the determination means that each pair of left-eye images and right-eye images are alternately photographed at a predetermined time difference. The stereoscopic image display apparatus according to claim 1, wherein the left-eye image and the right-eye image are alternately displayed. A stereoscopic video display device that displays a stereoscopic video by displaying a left-eye image and a right-eye image having binocular parallax in the same frame,
Based on the input left-eye image and right-eye image of a plurality of frames, each pair of left-eye image and right-eye image was taken at the same time, or alternately taken at a predetermined time difference. A determination means for determining whether or not
When it is determined by the determination means that each pair of left-eye images and right-eye images is alternately captured, either the left-eye image or the right-eye image is synthesized from a plurality of frames. Display control means for sequentially generating the displayed images and displaying them in the same frame as the other image;
Have
Whether the determination means has taken the left eye image and the right eye image at the same time by comparing the luminance changes of the left eye image and the right eye image over the plurality of frames. A stereoscopic image display device for determining whether or not images are alternately photographed at a predetermined time difference. The display control means, when it is determined by the determination means that each pair of left-eye images and right-eye images is taken at the same time, the input left-eye image without performing the synthesis The stereoscopic image display apparatus according to claim 3, wherein the right-eye image and the right-eye image are displayed in the same frame . A control method for a stereoscopic video display device that displays a stereoscopic video by alternately displaying a left-eye image and a right-eye image having binocular parallax in a time-sharing manner,
Based on the input left-eye image and right-eye image of the plurality of frames, the determination means is that each pair of left-eye image and right-eye image is taken simultaneously or alternately with a predetermined time difference. A determination step for determining whether the image was taken
If the display control means determines that each pair of left-eye image and right-eye image is taken at the same time in the determination step, a plurality of either the left-eye image or the right-eye image A display control step for sequentially generating images synthesized from the frames and displaying the images alternately with the other image;
Have
In the determination step, the determination unit compares the luminance changes of the left-eye image and the right-eye image over the plurality of frames, so that the left-eye image and the right-eye image are simultaneously captured. A control method for a stereoscopic image display apparatus, wherein it is determined whether the image is captured or alternately photographed at a predetermined time difference. A control method of a stereoscopic video display device that displays a stereoscopic video by displaying a left-eye image and a right-eye image having binocular parallax in the same frame,
Based on the input left-eye image and right-eye image of the plurality of frames, the determination means is that each pair of left-eye image and right-eye image is taken simultaneously or alternately with a predetermined time difference. A determination step for determining whether the image was taken
When the display control unit determines in the determination step that each pair of left-eye images and right-eye images is alternately captured, either the left-eye image or the right-eye image is displayed. A display control step of sequentially generating an image synthesized from a plurality of frames and displaying the same frame as the other image;
Have
In the determination step, the determination unit compares the luminance changes of the left-eye image and the right-eye image over the plurality of frames, so that the left-eye image and the right-eye image are simultaneously captured. A control method for a stereoscopic image display apparatus, wherein it is determined whether the image is captured or alternately photographed at a predetermined time difference.   The program for functioning a computer as each means which the three-dimensional video display apparatus of any one of Claims 1 thru | or 4 has.

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