JP2019049628A - Video display device and video production support method - Google Patents

Abstract

To provide a video display device which enables a video producer to sufficiently recognize an original resolution of a high definition video, namely 4K or 8K, by supporting work at an appropriate viewing distance adjusted to individual traits, such as eyesight of the video producer, and thereby maximally realize a video expression benefitting from the resolution.SOLUTION: Provided is a video display device used by a video producer who carries out video production by displaying a video. The video display device comprises: video signal format detection means for detecting a resolution of a video signal; viewing distance registration means for determining and registering an optimal viewing distance on the basis of the resolution of the detected video signal and eyesight of the video producer; and warning means for issuing a warning when the video producer deviates from the registered viewing distance by a predetermined range.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a video display device, and more particularly, to a video display device used at a video production site.

  With the development of digital technology in recent years, the technology of video expression is also advanced. High resolution images such as 4K and 8K are being produced more and more mainly in the broadcast field. 4K is an image corresponding to the number of pixels of around 4000 horizontal × 2000 vertical, and 8K is an image corresponding to the number of horizontal 7680 × vertical 4320 pixels. This corresponds to 4 × 4K and 8 × 16 × pixels compared to the conventional full high definition (2K) image.

  Such high resolution images are required to have higher image reproduction performance in an image display apparatus used for viewing as compared with the prior art. In addition, it is reported that the visual distance with respect to the screen height is important not only for the image reproduction performance of the image display device, but also for better feeling of realism and realism when viewing this. (Non-Patent Document 1).

  As for the viewing distance to the image display device used for viewing, in addition to the image display device represented by a television, it is likely to exert an adverse effect on the human body (a decrease in eyesight or fatigue), so it approaches the screen. In order to limit viewing and listening to this too much, there has been proposed a method of performing viewing restriction such as power off when approaching a certain distance (Patent Document 1). In this method, the viewing restriction distance is changed according to the resolution of the video.

  Further, Patent Document 2 describes a video display device capable of preventing a three-dimensional sickness or the like in 3D video by urging a viewer to be away from the video display unit by an optimal viewing distance or more.

JP 2008-42353 A JP 2012-222622 A

Yuichi Kusakabe et al., "Preferred Visual Distance and Subjective Evaluation of Presence and Realism Using Super Hi-Vision 85 Inch LCD," Technical Report of The Institute of Image Information and Television Engineers, pp. 245-250. Landolt ring [searched August 30, 2017], Internet <https://cho45.stfuawsc.com/landolt/landolt.html> Satoru Kubota "Requirements of Pixel Density from the Viewpoint of Usage of Display"

  However, since all of these techniques have viewpoints on how to view the completed video content, they have not reached the consideration for making these high-resolution videos into optimal video content.

  By the way, in the broadcast industry, various video display devices such as a view finder of a camera for shooting and a business monitor for video editing are used in order to check a shot video as broadcast content and perform work. These professional-use video display devices (TV monitors) are not simply equipment for viewing video, but are equipment for video production, and are positioned as measuring instruments that are visually evaluated by humans. It goes without saying that the proper setting of the television monitor equipment is enough for the video producer to realize the maximum resolution that corresponds to the 4K and 8K high-definition video formats or the video expression that makes use of it. It can be said that the user of the monitor must use it at an appropriate viewing distance. A video that utilizes resolution is a video that gives the viewer a sense of reality and reality, and the higher the resolution, the more it is possible to give the viewer such feeling. Normally, when shooting a real thing or landscape with a camera, it is not possible to focus (focus) on everything that was shot, and the producer (photographer) chooses the one that you want to focus and produces (shoots) the image. ing. At that time, when the focus (focus) is out, the resolution becomes low (blur).

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to support working at an appropriate viewing distance in accordance with individual characteristics such as the visual acuity of a video creator. An object of the present invention is to provide a video display device which enables a video producer to fully recognize the original resolution of high-definition video such as 4K and 8K and to realize maximum video expression utilizing the resolution.

  In order to solve the above problems, the invention described in one embodiment is a video display device used by a video creator who displays video and produces video, and a video signal for detecting the resolution of a video signal. From format detection means, visual distance registration means for determining and registering the optimum visual distance based on the resolution of the detected video signal and the visual acuity of the video creator, and from the visual distance registered by the video creator And a warning unit for giving a warning when it deviates from the predetermined range.

  The invention described in another embodiment is a video production support method in a video display apparatus used by a video producer who displays video and produces video, and the video signal format detection step of detecting the resolution of a video signal. And a visual distance registration step of determining and registering an optimal visual distance based on the resolution of the detected video signal and the visual acuity of the video creator, and a predetermined range from the visual distance registered by the video creator. And a warning step of giving a warning when it deviates.

It is a schematic block diagram of the video display apparatus of this embodiment. It is a figure which shows the processing flow of the video display apparatus of this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail.

  The video display device according to the present embodiment is a video display device used by a video creator who displays video and produces video, and is, for example, a view finder of a camera or a business monitor. The video producer is, for example, a cameraman, a video editor, or the like. In this specification, the video producer is also simply referred to as a "user". A video display device used by a video producer, unlike a consumer television that focuses on making the video look clear, can be said to focus on reproducing the input video signal as faithfully as possible.

  FIG. 1 is a schematic block diagram of a video display apparatus according to the present embodiment. The video display device includes a video signal input unit 101, a video signal format detection unit 102, a visual acuity measurement pattern signal generation unit 103, a visual distance setting pattern signal generation unit 104, and various display OSDs (On Screen Display). A generation unit 105, a distance sensor 106, a visual distance detection unit 107, a visual distance estimation unit 108, a video signal processing unit 109, various control processing units 110, a video signal display unit 111, a storage unit 112, A warning unit 113 and an information input / output unit 114 are provided.

  The video signal input unit 101 performs input processing on the video signal input to the video display device. For example, when the video display device is a view finder of a camera, a video signal obtained by the imaging means such as a CCD is input and processed. When the video display device is a business monitor, it is transmitted from the camera Input video signal in the SDI format.

  The video signal format detection unit 102 detects the format (resolution) of the video signal input from the video signal input unit 101 from the timing of the synchronization signal or the information of the auxiliary signal. The video signal format is format information of a video signal using a resolution such as 4K or 8K as a parameter, and is information that can specify the resolution. If the input signal can not be discriminated, the format can be selected on the menu screen.

  The visual acuity measurement pattern signal generation unit 103 generates a video signal pattern of a Landolt ring used to measure the visual acuity of the video producer (user). Landolt's ring is a display generally used in vision testing.

  The visual distance setting pattern signal generation unit 104 generates a video signal pattern of a display used to determine an optimal visual distance. For example, the following two patterns can be used as the patterns for setting the visual distance. One is a pattern with fineness close to the limit that can be reproduced in each video format (for example, black and white stripes etc.), and the other is a pattern in which two types of video with the same pattern but different resolutions are arranged side by side. Are mentioned as an example.

  The various display OSD generation unit 105 generates a display screen of various information and menus. The generated display screen is displayed on the video signal display unit 111 by the video signal processing unit 109.

  The distance sensor 106 is a distance measuring means such as infrared light that measures the distance between the user and the image display apparatus by recognizing the position of the user. It is preferable that the distance sensor 106 be set to measure a place where the influence of the user's posture or operation such as the distance of the user's torso portion is small. The viewing distance detection unit 107 acquires, in real time, distance information between the user measured by the distance sensor 106 and the image display apparatus.

  The viewing distance estimation unit 108 estimates optimal viewing distance information from the format of the input video signal and the setting of the user. The visual distance can be estimated, for example, by keeping the visual distance corresponding to the reference visual acuity for each video format, and comparing the reference visual acuity for each video format with the set visual acuity.

  The video signal processing unit 109 performs video signal processing for displaying on the video signal display unit 111. It performs processing such as switching input signals and pattern signals, adjusting video signal levels, superimposing an OSD display on a screen, converting in accordance with the signal format handled by the video signal display unit, adjusting timing of video signals, and the like.

  The various control processing unit 110 controls each part of the video display device to organize the entire system.

  The video signal display unit 111 is a liquid crystal panel or an OLED (organic EL) panel that displays video signals.

  The storage unit 112 is a storage unit such as a memory, a hard disk, or an SSD that stores the measured visual acuity information of the user and the measured visual distance information of the user in association with the ID.

  The warning unit 113 issues a warning when the viewing distance range set in advance is deviated based on the result of measuring the viewing distance of the user in real time. The warning method may be any of an audio warning and a display warning. As the visual distance range, a plurality of persons may measure in advance how much the visual distance range in which the resolution can be recognized will be obtained. Alternatively, the user may optionally use the information input / output unit 114. You may enter a value.

  The information input / output unit 114 is a user interface for exchanging information between the video display device and the user. For example, various input devices such as a mouse, a keyboard, and a microphone, and various output devices such as a speaker and a display monitor Can be used.

  FIG. 2 is a diagram showing a processing flow of the video display apparatus of the present embodiment. The operation (video production support method) of the video display device of the present embodiment will be described based on FIG.

  First, after the start of use by turning on the power of the video display device or the like, when a video signal to be viewed by the user of the video display device is input from the video signal input unit 101, the video signal format detection unit 102 And detects the format (also referred to as resolution) of the input video signal (S1). The various control processing unit 110 can temporarily store the information of the format of the detected video signal in the storage unit 112. As the resolution detection method, a known method can be used. For example, a method of acquiring from ANC (ancillary) information etc. separately placed on the video signal from the video, a method of judging from the signal timing, etc. Can. When the input video signal is not the resolution as it is but the resolution is converted and displayed, the resolution setting menu generated by the various display OSD generating unit 104 and the video signal processing unit 109 is displayed in the video signal display unit It can be displayed on 111 and can be set by the user.

  Next, the vision of the user of the video display device is set (S2). The various control processing unit 110 can store the information of the set visual acuity in the storage unit 112. As a specific setting method of visual acuity, for example, it can carry out by either of two methods.

  The first method is to display the Landolt ring generated by the visual acuity measurement pattern signal generation unit 103 and the video signal processing unit 109 on the video signal display unit 111, and the user to the Landolt ring via the information input / output unit 114. The eyesight of the user is measured by measuring the distance when the user can correctly observe the Landolt ring by using the distance sensor 106 and the visual distance detection unit 107 by inputting the break of the Set Landolt's ring is an alphabet "C" that changes the direction of the break, and is a display generally used in vision tests. As described in Non-Patent Document 2, the size of the Landolt ring is adjusted and displayed according to the resolution (scale) and the viewing distance.

  In the second method, when the visual acuity of the user of the video display device is known, the user is made to input information on the visual acuity through the information input / output unit 114. At this time, the various-display OSD generating unit 105 generates a display such as “Please enter your visual acuity if you understand your visual acuity” and the display generated by the video signal processing unit 109 is displayed on the video signal display unit 111. can do.

  When the format of the video signal is detected and the user's visual acuity is set, the optimum visual distance is estimated based on the information (S3). In the estimation of the visual distance, the visual distance estimation unit 108 estimates the position of the visual distance by applying the format of the video signal detected in S1 and the visual acuity of the user set in S2 in advance to a calculation formula It is done by

  The estimation of the visual distance is estimated according to the resolution of the video signal and the visual acuity so as to satisfy the requirement of the angular resolution 60 cpd for the visual acuity 1.0 of the user. Specifically, it can be estimated, for example, based on "B. When the requirement of 60 cpd based on the recently shown real feeling is applied" in Non-Patent Document 3. For example, assuming that the standard visual acuity is 1.0, in the case of the 8K format, the viewing distance is 1.5 times (1.5H) the screen height, and in the case of the 4K format the viewing distance is 3.0 times the screen height When there is a standard of (3.0 H), the information input / output unit 114 estimates the visual distance based on the difference between the standard visual acuity and the user's visual acuity set in S2. The information input / output unit 114 sets the distance such that the visual distance is smaller if the visual acuity set is lower than the reference visual acuity, and the visual distance is higher if the visual acuity set than the reference acuity is higher The distance can be estimated to be large.

  When the visual distance is estimated, the visual distance registration process is performed (S4). Since the estimated visual distance is a generally optimum visual distance, it is possible to make fine adjustments in accordance with the user, and after adjusting to the optimal visual distance reflecting personal habits and preferences, When receiving the input of the visual distance determined through the information input / output unit 114, the various control processing unit 110 registers the visual distance by storing the visual distance input to the storage unit 112.

  Specifically, first, the visual distance detection unit 107 detects the visual distance of the user by measuring the existing position of the user using the distance sensor 106. The various control processing unit 110 specifies the difference between the detected visual distance and the estimated visual distance, and instructs the information input / output unit 114 to guide the user to the estimated visual distance position. For example, in the case where the visual distance of the detected user is 60 cm and the visual distance of the estimated user is 40 cm, the various control processing unit 110 approaches the screen by “about 20 cm via the information input / output unit 114 Voice output such as "Please." By outputting the voice in this manner, the user can be guided to an approximate position. Along with the audio output, or alternatively, the various display OSD generating unit 105 may display the content of the guidance for the user on the video signal display unit 111.

  Furthermore, the video signal processing unit 109 displays the visual distance setting pattern generated by the visual distance setting pattern signal generation unit 104 on the video signal display unit 111, and the limit resolution of the video format at the visual distance considering the visual acuity. Make sure that the user can recognize. When the information input / output unit 114 receives a setting end instruction from the user at a position where the user can confirm the visual distance setting pattern by the visual distance setting pattern display, the various control processing units 110 The visual distance of the user is measured and detected by the sensor 106 and the visual distance detection unit 107, and the visual distance at that position is registered as the optimal visual distance. As described above, since the pattern for setting the viewing distance is actually displayed and the fine adjustment is performed, the viewing is also performed in consideration of the eyelid when the user actually sees the display on the screen, such as the eyelid looking at the screen The distance can be registered as the optimal viewing distance.

  For example, the following two patterns can be used as the patterns for setting the visual distance. (1) A pattern of fineness close to the limit which can be reproduced in each video format (generally, a black and white stripe pattern is used) is used to judge whether the pattern can be recognized as being displayed without being crushed. (2) Two kinds of images having the same pattern and different resolutions are displayed side by side, and it is judged whether or not the difference in resolution between the two can be distinguished. Display the image made in the format you want to display and the image made in the lower resolution.

  When the viewing distance is registered, the video signal processing unit 109 displays the input video signal on the video signal display unit 111. When the display of the video signal is started, the various control processing unit 110 monitors whether the user is out of the viewing distance range (S5). The various control processing unit 110 periodically monitors whether the user is out of the viewing distance range by detecting the viewing distance of the user by the distance sensor 106 and the viewing distance detection unit 107. The range to be the optimum viewing distance can be set in advance automatically as a value derived from the experience value, or can be adjusted by the user on the menu screen.

  If it is determined that the visual distance is out of the visual distance range (S5: Yes), the various control processing unit 110 outputs a message when the visual distance exceeds the allowable range by the warning unit 113, and the allowable visual range permits The user is warned that the user is out (S6).

  In the process shown in FIG. 2, the setting process (S2) of visual acuity and the estimation process (S3) of visual distance can be omitted. In this case, when the user's ID is input in the information input / output unit 114, the various control processing unit 110 can call information on the optimal viewing distance for each user stored in advance in the storage unit 112. If the various control processing units 110 associate the viewing distances registered in the process shown in FIG. 2 with the use case including the video format and store the optimum viewing distances in the storage unit 112 for each user ID, Good. If the number of users is not one but fixed to one, it may be preset as previously used (or fixed) data as default data when the power is turned on, regardless of the ID.

  According to the image display device of the present embodiment, the image creator can achieve high definition such as 4K and 8K by supporting working at an appropriate viewing distance according to individual characteristics such as the visual acuity of the image creator. It is possible to provide an image display apparatus and an image production support method that can fully realize the original resolution of the image and realize the maximum image expression utilizing the resolution.

101 image signal input unit 102 image signal format detection unit 103 visual acuity measurement pattern signal generation unit 104 visual distance setting pattern signal generation unit 105 various display OSD (On Screen Display) generation unit 106 distance sensor 107 visual distance detection unit 108 viewing Distance estimation unit 109 Video signal processing unit 110 Various control processing units 111 Video signal display unit 112 Storage unit 113 Warning unit 114 Information input / output unit

Claims (6)

A video display device used by a video producer who displays video and produces video.
Video signal format detection means for detecting the resolution of the video signal;
Visual distance registration means for determining and registering an optimal visual distance based on the resolution of the detected video signal and the visual acuity of the video creator;
And a warning means for giving a warning when the video creator deviates from a predetermined range from the registered viewing distance. Based on the visual acuity measurement means for displaying the visual acuity test display on the display screen displaying the video and measuring the visual acuity of the video creator, and based on the visual acuity measured by the visual acuity measurement means and the resolution of the detected video signal. And visual distance estimation means for estimating the optimum visual distance.
2. The video display apparatus according to claim 1, wherein information about a pre-estimated visual distance is presented to the video creator before registering an optimal visual distance in the visual distance registration means.   2. The video display apparatus according to claim 1, wherein the visual distance registration unit registers the optimal visual distance using information of an optimal visual distance stored in advance for each video creator. A video production support method for a video display device used by a video producer who displays video and produces video,
A video signal format detection step of detecting the resolution of the video signal;
A visual distance registration step of determining and registering an optimal visual distance based on the resolution of the detected video signal and the visual acuity of the video creator;
And a warning step of giving a warning when the video creator deviates from a predetermined range from the registered viewing distance. Based on the visual acuity measurement step of displaying the visual acuity test display on the display screen displaying the video and measuring the visual acuity of the video creator, and based on the visual acuity measured in the visual acuity measurement step and the resolution of the detected video signal. And a visual distance estimation step of estimating the optimal visual distance.
5. The video production support method according to claim 4, wherein information about a previously estimated visual distance is presented to the video creator before registering an optimal visual distance in the visual distance registration step.   5. The video production support method according to claim 4, wherein the viewing distance registration step registers the optimal viewing distance using information of an optimal viewing distance stored in advance for each video creator.

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