JP6930880B2 - Video display device and video production support method - Google Patents

Description

The present invention relates to a video display device, and more particularly to a video display device used in the field of video production.

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

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

Regarding the viewing distance to the video display device used for viewing, in addition, since the video display device represented by the television may have an adverse effect on the human body (decrease in eyesight and fatigue), it approaches the screen. In order to limit viewing of this excessively, a method of restricting viewing such as turning off the power when approaching a certain distance has been proposed (Patent Document 1). In this method, the distance for parental control is changed according to the resolution of the video.

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

Japanese Unexamined Patent Publication No. 2008-42353 Japanese Unexamined Patent Publication No. 2012-22622

Yuichi Kusakabe and 4 other authors, "Preferable viewing distance using Super Hi-Vision 85-inch LCD and subjective evaluation of realism and realism," Technical Report of the Institute of Image Information and Television Engineers, pp. 245-250. Randolt Tamaki [Searched on August 30, 2017], Internet <https://cho45.stfuawsc.com/landolt/landolt.html> Satoru Kubota "Requirements for Pixel Density from the Viewpoint of Display Usage"

However, since all of these technologies have a viewpoint of how to appreciate the completed video content, they have not taken care to make these high-resolution videos into the optimum video content.

By the way, in the broadcasting industry, various video display devices such as a viewfinder of a camera for shooting and a professional monitor for video editing are used in order to confirm the shot video as broadcast content and perform work. These commercial video display devices (television monitors) are not merely equipment for viewing images, but equipment for video production, and are positioned as measuring instruments that are visually evaluated by humans. Needless to say, in order for video producers to maximize the resolution that matches the high-definition video formats of 4K and 8K, or the video expression that makes the best use of it, it goes without saying that the TV monitor equipment is properly set. It can be said that the monitor user must use it at an appropriate viewing distance. An image that makes use of the resolution is an image 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 a feeling. Normally, when you shoot a real thing or landscape with a camera, you cannot focus on everything you shot, and the creator (photographer) selects the one you want to focus on and creates (shoots) the image. ing. At that time, the resolution becomes low (blurred) where the focus is out of focus.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to support work at an appropriate viewing distance according to individual characteristics such as the eyesight of a video producer. An object of the present invention is to provide a video display device that enables a video creator to fully recognize the original resolution of a high-definition video such as 4K or 8K and realize a video expression that makes the best use of 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 a video and produces a video, and is a video signal for detecting the resolution of the video signal. From the format detection means, the 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 the visual distance registered by the video creator. The image display device is provided with a warning means for giving a warning when the range is out of a predetermined range.

The invention described in another embodiment is a video production support method in a video display device used by a video creator who displays a video and produces a video, and is a video signal format detection step for detecting the resolution of the video signal. A viewing distance registration step of determining and registering an optimum viewing distance based on the resolution of the detected video signal and the visual field of the video creator, and a predetermined range from the viewing distance registered by the video creator. It is a video production support method characterized by including a warning step for giving a warning when the video is disengaged.

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

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

The video display device of the present embodiment is a video display device used by a video creator who displays a video and produces a video, and is, for example, a viewfinder of a camera or a monitor for business use. 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". It can be said that the video display device used by the video creator is different from the consumer television, which is focused on making the video look beautiful, and is focused on reproducing the input video signal as faithfully as possible.

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

The video signal input unit 101 inputs and processes 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 acquired by a visualization means such as a CCD is input and processed, and when the video display device is a professional monitor, it is transmitted from the camera. SDI format video signal is input and processed.

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 having a resolution of 4K, 8K, or the like as a parameter, and is information that can specify the resolution. If it cannot be determined from the input signal, the format can be selected on the menu screen.

The visual acuity measurement pattern signal generation unit 103 generates a video signal pattern of the Randold ring used for measuring the visual acuity of the video creator (user). The Randold ring is a display commonly used in low vision tests.

The viewing distance setting pattern signal generation unit 104 generates a video signal pattern for the display used to determine the optimum viewing distance. For example, the following two patterns can be used as the pattern for setting the viewing distance. One is a pattern with a fineness close to the limit that can be reproduced in each video format (for example, a black and white striped pattern), and the other is a pattern in which two types of images with the same pattern but different resolutions are lined up side by side. Is given as an example.

The OSD generation unit 105 for various displays generates display screens for 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 rays that measures the distance between the user and the image display device by recognizing the presence position of the user. The distance sensor 106 is preferably set to measure a portion that is less affected by the posture or movement of the user, such as the distance of the body portion of the user. The viewing distance detection unit 107 acquires the distance information between the user and the image display device measured by the distance sensor 106 in real time.

The viewing distance estimation unit 108 estimates the optimum viewing distance information from the format of the input video signal and the individual settings of the user. For the estimation of the visual acuity, for example, the visual acuity corresponding to the reference visual acuity is maintained for each video format, and the visual acuity can be estimated by 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. Processing such as switching the input signal and the pattern signal, adjusting the video signal level, superimposing the OSD display on the screen, converting according to the signal format handled by the video signal display unit, and adjusting the timing of the video signal is performed.

The various control processing units 110 control each part of the video display device and organize the entire system.

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

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

The warning unit 113 issues a warning when the user's viewing distance is out of the preset viewing distance range based on the result of measuring the viewing distance in real time. The warning method may be any method such as a voice warning and a display means warning. As the viewing distance range, a viewing distance range in which the resolution can be recognized may be measured in advance by a plurality of people, or the user may use an arbitrary viewing distance range via 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, keyboard, and microphone, speakers, various output devices such as a display monitor, and the like. Can be used.

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

First, after starting use by turning on the power of the video display device or the like, when the 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 , Detects the format (also referred to as resolution) of the input video signal (S1). Various control processing units 110 can temporarily store the detected video signal format information in the storage unit 112. As the resolution detection method, a known method can be used. For example, a method of acquiring the video signal from ANC (ancillary) information separately placed on the video signal, a method of discriminating from the signal timing, or the like is used. Can be done. Further, when the input video signal is displayed by converting the resolution instead of the original resolution, the video signal display unit displays the resolution setting menu generated by the various display OSD generation units 104 and the video signal processing unit 109. It can be displayed on 111 and set by the user.

Next, the visual acuity of the user of the video display device is set (S2). Various control processing units 110 can store the set visual acuity information in the storage unit 112. As a specific method of setting the visual acuity, for example, one of two methods can be used.

In the first method, the Randold ring generated by the visual measurement pattern signal generation unit 103 and the video signal processing unit 109 is displayed on the video signal display unit 111, and the Randolt ring is displayed by the user via the information input / output unit 114. By inputting the break, the distance sensor 106 and the viewing distance detection unit 107 measure the distance when the user can or cannot observe the Randold ring correctly, thereby measuring the user's eyesight. Set. The Randold ring is the letter "C" that changes the direction of the cut, and is a display generally used in low vision tests. As described in Non-Patent Document 2, the size of the Randold 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 the information of the visual acuity via the information input / output unit 114. At this time, the OSD generation unit 105 for various displays generates a display such as "If you know your eyesight, enter your eyesight", 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 visual acuity of the user is set, the optimum visual acuity is estimated based on this 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 to a predetermined calculation formula. It is done by things.

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

When the viewing distance is estimated, the viewing distance is registered (S4). Since the estimated viewing distance is generally the optimum viewing distance, it is possible to make fine adjustments according to the user, and after adjusting to the optimum viewing distance that reflects individual habits and preferences, Upon receiving the input of the viewing distance determined via the information input / output unit 114, the various control processing units 110 register the viewing distance by storing the viewing distance input to the storage unit 112.

Specifically, first, the viewing distance detection unit 107 detects the user's viewing distance by measuring the user's existing position with the distance sensor 106. The various control processing units 110 specify the difference between the detected viewing distance and the estimated viewing distance, and the information input / output unit 114 gives an instruction to guide the user to the position of the estimated viewing distance. For example, when the detected viewing distance of the user is 60 cm and the estimated viewing distance of the user is 40 cm, the various control processing units 110 "approach the screen by about 20 cm" via the information input / output unit 114. Please output a voice such as "Please." By outputting the voice in this way, the user can be guided to an approximate position. Together with the audio output, or as an alternative, the various display OSD generation units 105 may display the content of guidance to the user on the video signal display unit 111.

Further, 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 is determined by the visual distance in consideration of the visual acuity. Make sure that the user can recognize. By displaying the viewing distance setting pattern, the information input / output unit 114 receives an instruction from the user to complete the setting at a position where the user can confirm the viewing distance setting pattern, so that the various control processing units 110 move the distance. The viewing distance of the user is measured and detected by the sensor 106 and the viewing distance detecting unit 107, and the viewing distance at that position is registered as the optimum viewing distance. In this way, since the pattern for setting the viewing distance is actually displayed and fine adjustment is performed, the viewing that takes into consideration the habit of actually viewing the display on the screen, such as the habit of looking into the screen. The distance can be registered as the optimum viewing distance.

For example, the following two patterns can be used as the pattern for setting the viewing distance. (1) Using a pattern with a fineness close to the limit that can be reproduced in each video format (generally, a black and white striped pattern is used), it is judged whether or not the pattern can be recognized as being displayed without being crushed. (2) Two types of images with the same pattern but 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 video created in the format you want to display and the video created in a resolution lower than that.

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 units 110 monitor whether or not the user is out of the viewing distance range (S5). The various control processing units 110 periodically detect the viewing distance of the user by the distance sensor 106 and the viewing distance detecting unit 107 to monitor whether or not the user is out of the viewing distance range. The optimum viewing distance range can be automatically set in advance by a value calculated from the experience value, or can be adjusted by the user on the menu screen.

When it is determined that the viewing distance is out of the viewing distance range (S5: Yes), the various control processing units 110 issue a message when the viewing distance exceeds the permissible range by the warning unit 113, and the permissible range of the optimum viewing distance. Warn the user that he / she is outside (S6).

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

According to the video display device of the present embodiment, by supporting the work at an appropriate viewing distance according to the individual characteristics such as the eyesight of the video creator, the video creator has high definition such as 4K or 8K. It is possible to provide a video display device and a video production support method that can fully recognize the original resolution of a video and realize a video expression that makes the best use of the resolution.

101 Video signal input unit 102 Video signal format detection unit 103 Vision measurement pattern signal generation unit 104 Viewing distance setting pattern signal generation unit 105 Various display OSD (On Screen Display) generation unit 106 Distance sensor 107 Viewing distance detection unit 108 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 video creators who display video and produce video.
Video signal format detection means that detects the resolution of the video signal,
A visual acuity measuring means for measuring the visual acuity of the video creator by displaying a visual acuity test display on a display screen for displaying a visual acuity.
A visual distance registration means for determining and registering an optimum visual distance based on the resolution of the detected video signal and the visual acuity of the video creator.
A video display device comprising: a warning means for giving a warning when the video creator deviates from the registered viewing distance within a predetermined range. Further provided with a visual acuity estimation means for estimating the optimum visual acuity based on the visual acuity measured by the visual acuity measuring means and the resolution of the detected video signal.
The video display device according to claim 1, wherein information on a pre-estimated viewing distance is presented to the video creator before the optimum viewing distance is registered in the viewing distance registration means. The viewing distance registration means adjusts the viewing distance estimated by the viewing distance estimating means for each video producer, and registers the adjusted viewing distance as the optimum viewing distance for each video producer. 2. The video display device according to claim 2. This is a video production support method for video display devices used by video producers who display video and produce video.
A video signal format detection step that detects the resolution of the video signal,
A visual acuity measurement step of displaying a visual acuity test display on a display screen for displaying a visual acuity and measuring the visual acuity of the video creator, and a visual acuity measurement step.
A viewing distance registration step of determining and registering an optimum viewing distance based on the resolution of the detected video signal and the visual acuity of the video creator, and
A video production support method comprising a warning step of giving a warning when the video creator deviates from the registered viewing distance within a predetermined range. Further including a visual acuity estimation step for estimating the optimum visual acuity based on the visual acuity measured in the visual acuity measurement step and the resolution of the detected video signal.
The video production support method according to claim 4, wherein information on a pre-estimated viewing distance is presented to the video producer before registering the optimum viewing distance in the viewing distance registration step. In the viewing distance registration step , the viewing distance estimated in the viewing distance estimation step is adjusted for each video producer, and the adjusted viewing distance is registered as the optimum viewing distance for each video producer. The video production support method according to claim 5, which is a feature.

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