JP2022037534A - Terminal device and evaluation method - Google Patents

Abstract

[Problem] To provide a terminal device and an evaluation method capable of evaluating the image quality of a display device without using a dedicated external sensor. [Solution] A tablet terminal 10 includes a wireless I/F 31 that wirelessly transmits a video signal for displaying a predetermined image to a monitor device 20, an outer camera 14 that is disposed on the surface of a housing 11 of the tablet terminal 10 and captures a predetermined image displayed on the display screen 21 based on the video signal while the tablet terminal 10 is placed in a position where the surface of the housing 11 faces the display screen 21 of the monitor device 20, and an evaluation unit 103 that evaluates the image quality of the monitor device 20 based on the captured predetermined image. [Selected Figure] Figure 5

Description

The present invention relates to a terminal device and an evaluation method.

In recent years, high-definition and diversified display devices have been advancing, and it is desired to display an image on a display device with a desired image quality according to an application or the like. A related monitor device for a PC (Personal Computer) has a function that can be adjusted to a desired image quality by making the display characteristics variable. A display device having such a function of adjusting and evaluating image quality is used as, for example, a medical monitor for interpreting a medical image, a DTP (Desktop Publishing) monitor for designing a publication, and the like.

As a related technique, for example, Patent Document 1 is known. Patent Document 1 describes a technique of measuring the brightness and color of a display screen of a display device with a luminance sensor and adjusting the image quality of the display screen according to the measurement result.

Japanese Unexamined Patent Publication No. 2020-003694

As described above, according to the technique described in Patent Document 1, the image quality of the display device can be evaluated by using the luminance sensor. However, in the technique described in Patent Document 1, a dedicated external sensor that is externally connected to a display device or a PC is indispensable as a sensor for measuring the brightness of the display screen. Therefore, the technique described in Patent Document 1 has a problem that the image quality of the display device cannot be evaluated without using a dedicated external sensor.

The present invention is a terminal device for evaluating the image quality of a display device, which is arranged on the surface of a housing of the terminal device and a wireless communication unit that wirelessly transmits a video signal for displaying a predetermined image to the display device. An imaging unit that captures a predetermined image displayed on the display screen based on the video signal in a state where the surface of the housing faces the display screen of the display device. Provided is a terminal device including a unit and an evaluation unit for evaluating the image quality of the display device based on the captured predetermined image.

The present invention is an evaluation method in which a terminal device evaluates the image quality of a display device, and a video signal for displaying a predetermined image is wirelessly transmitted to the display device and arranged on the surface of a housing of the terminal device. The image pickup unit captures a predetermined image displayed on the display screen based on the video signal in a state where the surface of the housing faces the display screen of the display device, and the image is captured. Provided is an evaluation method for evaluating the image quality of the display device based on a predetermined image.

According to the present invention, it is possible to provide a terminal device and an evaluation method capable of evaluating the image quality of a display device without using a dedicated external sensor.

It is a block diagram which shows the appearance structure of the tablet terminal which concerns on Embodiment 1. FIG. It is a block diagram which shows the appearance structure of the monitor apparatus which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the monitor quality control system which concerns on Embodiment 1. FIG. It is a figure for demonstrating the monitor accuracy control method which concerns on Embodiment 1. FIG. It is a block diagram which shows the structure of the monitor quality control system which concerns on Embodiment 2. FIG. It is a sequence diagram which shows the monitor quality control method which concerns on Embodiment 2. FIG. It is a figure for demonstrating the monitor accuracy control method which concerns on Embodiment 2. FIG. It is a figure which shows the example of the test pattern used in the monitor accuracy control method which concerns on Embodiment 2. FIG. It is a figure which shows the example of the luminance characteristic evaluated by the monitor accuracy control method which concerns on Embodiment 2. FIG. It is a block diagram which shows the structure of the monitor quality control system which concerns on Embodiment 3. FIG. It is a sequence diagram which shows the pairing method which concerns on Embodiment 3.

Hereinafter, embodiments will be described with reference to the drawings. In each drawing, the same elements are designated by the same reference numerals, and duplicate explanations are omitted as necessary.

(Embodiment 1)
First, the first embodiment will be described. In this embodiment, an example of performing monitor accuracy control using a tablet terminal will be described. In addition, "monitor accuracy control" or "monitor display accuracy control" is to measure the brightness of the display screen of the monitor device and evaluate and manage the image quality of the monitor device. Includes adjusting image quality based on. In the present embodiment, as an example of monitor accuracy management, the image quality of the monitor device is evaluated, but the image quality of the monitor device may be further adjusted.

<Outline of Embodiment 1>
As described above, in the related technology, a dedicated external sensor that is externally connected to the monitor device or the PC is required to measure the brightness of the monitor device or the like. Since the dedicated external sensor unit is a separate device from the monitor device itself, the problem is that individual management is required. Further, since a dedicated external sensor is generally expensive, it is difficult to have as many sensors as the number of monitoring devices owned, and it is common to share a small number of sensors with a plurality of monitoring devices. For this reason, there is a problem that it takes time and effort to connect a dedicated external sensor to the target monitor device or PC each time the monitor quality control work of the medical monitor for image interpretation is performed. Further, when measuring the display screen with a dedicated external sensor, it is necessary to mount the sensor so that the measuring unit of the sensor is correctly brought into close contact with a predetermined position on the display screen of the monitoring device. This point also causes a load on the user when using a dedicated external sensor. Therefore, in the present embodiment, the above problem can be solved by using the built-in camera of the tablet terminal.

<Structure of Embodiment 1>
1 (a) is a front view of the tablet terminal 10 according to the present embodiment, and FIG. 1 (b) is a rear view of the tablet terminal 10. The tablet terminal 10 according to the present embodiment is a tablet terminal equipped with monitor accuracy management software (evaluation function), and has the same external shape as a general tablet terminal. The tablet terminal 10 is an example of a tablet-type terminal device, and may be a smartphone, a mobile phone, or the like as long as it has the same shape and function.

As shown in FIG. 1, the tablet terminal 10 includes a rectangular and thin housing 11 when viewed from the front or the back. The housing 11 has a flat plate shape with flat front and back surfaces, and accommodates various hardware inside. The size of the housing 11, that is, the size of the tablet terminal 10, is the same as that of a general tablet terminal, for example, a size that accommodates a display screen of about 10 inches, and the thickness is 1 cm or less, but is not particularly limited.

The display screen 12 and the in-camera 13 are provided on the front surface 11a (front surface) of the housing 11, and the out-camera 14 is provided on the back surface 11b (front surface) of the housing 11. The display screen 12 is a flat display panel (display unit) such as a liquid crystal display panel or an organic EL (Electro Luminescence) display panel. For example, the display screen 12 has a size close to the front surface 11a of the housing 11, and is arranged in the center of the front surface 11a of the housing 11. The entire front surface 11a of the housing 11 may be used as the display screen 12, and the in-camera 13 may be arranged at the end of the display screen 12.

The in-camera 13 and the out-camera 14 are image pickup units such as a CCD (Charged-coupled devices) camera and a CMOS (Complementary metal-oxide-semiconductor) camera. The in-camera 13 is arranged at an arbitrary position on the edge portion (bezel) of the front surface 11a of the housing 11, and is arranged at the center of one short edge portion, for example. The out-camera 14 is arranged at an arbitrary position near the edge of the back surface 11b of the housing 11, and is, for example, arranged in the center of one short edge portion which is the same as the in-camera 13. For example, the out-camera 14 can capture an image with higher image quality than the in-camera 13, but is not particularly limited. The user can install or hold the tablet terminal 10 in any direction and use it. In the present embodiment, either the in-camera 13 or the out-camera 14 may be used, or the in-camera 13 and the out-camera 14 may be fixed and used in any of the up, down, left, and right directions.

FIG. 2A is a front external view of the monitor device 20 according to the present embodiment, and FIG. 2B is a sectional view taken along the line AB. The monitor device 20 according to the present embodiment is a display device of a monitor quality control target (evaluation target), for example, a medical monitor that displays a medical image, but may also be a monitor device for DTP or the like.

As shown in FIG. 2, the monitoring device 20 includes a rectangular display screen 21 when viewed from the front. The display screen 21 is a flat display panel such as a liquid crystal display panel or an organic EL display panel. The size of the display screen 21 is, for example, about 20 inches like a general medical monitor, but is not particularly limited.

The monitoring device 20 includes, for example, a bezel 21a around the display screen 21. The bezel 21a is a convex portion protruding from the display screen 21 in the thickness direction by about several mm. At the edge of the display screen 21, the surface of the display screen 21 and the side surface of the bezel 21a form a corner portion at a substantially right angle. As will be described later, the bezel 21a is a protruding portion on which the tablet terminal 10 is hooked and placed when the monitoring device 20 is evaluated. The monitor device 20 does not have to be provided with the bezel 21a, but in that case, it is preferable to provide a protruding member for mounting the tablet terminal 10 on the edge of the monitor device 20.

The monitor device 20 is supported by the stand 30 and is fixed in a predetermined orientation so that the user can stably view the display screen 21. For example, the monitor device 20 is fixed vertically by the stand 30, that is, so that the longitudinal direction is perpendicular to the installation surface of the stand 30, but it may be fixed horizontally. The stand 30 can change the vertical and horizontal orientation of the monitor device 20, and can also change the inclination of the display screen 21 of the monitor device 20. The inclination of the display screen 21 is, for example, an inclination when the display screen 21 is rotated from the vertical direction to the horizontal direction around the central portion of the display screen 21 supported by the stand 30.

FIG. 3 shows a configuration example of the monitor quality control system 1 according to the present embodiment. As shown in FIG. 3, the monitor quality management system 1 includes a tablet terminal 10 and a monitor device 20. The monitor quality management system 1 is an evaluation system for the tablet terminal 10 to evaluate the image quality of the monitor device 20. It should be noted that each configuration of FIG. 3 is an example, and other configurations may be used as long as the method according to the present embodiment is possible.

The tablet terminal 10 includes an I / F (interface) 15, a storage unit 16, and a control unit 100 in addition to the display screen 12, the in-camera 13, and the out-camera 14 shown in FIG. The in-camera 13 or the out-camera 14 is an image pickup unit arranged on any surface of the housing 11 of the tablet terminal 10. In the present embodiment, the surface of the housing 11 is displayed on the display screen 21 of the monitoring device 20. The image displayed on the display screen 21 is captured while being placed at the opposite positions.

The I / F 15 is a communication unit for communicably connecting to the monitor device 20, and the connection method and communication method are not particularly limited. The storage unit 16 is a non-volatile memory such as a flash memory, a hard disk device, or the like. The storage unit 16 stores programs and data necessary for the operation of the tablet terminal 10, and stores, for example, a monitor quality management program (software) for evaluating image quality, data necessary for evaluating image quality, and the like.

The control unit 100 is a control unit that controls the operation of each unit of the tablet terminal 10, and is a program execution unit such as a CPU (Central Processing Unit). The control unit 100 reads out the monitor quality control program stored in the storage unit 16 and executes the read program to realize each function (process).

The control unit 100 has, for example, a generation unit 101, an acquisition unit 102, and an evaluation unit 103 as functions realized by a monitor quality control program. The generation unit 101 generates a predetermined test pattern to be displayed on the monitor device 20, and transmits the generated test pattern to the monitor device 20 via the I / F 15. The generation unit 101 may acquire the test pattern stored in the storage unit 16. The acquisition unit 102 acquires an image captured by the in-camera 13 or the out-camera 14. In this example, an image of the test pattern displayed on the monitor device 20 is acquired. The evaluation unit 103 evaluates the image quality of the monitor device 20 based on the acquired image of the test pattern. The evaluation unit 103 evaluates, for example, the brightness of an image, but the evaluation unit 103 may evaluate not only the brightness but also the color.

The monitor device 20 includes an I / F 22, a storage unit 23, and a control unit 200 in addition to the display screen 21 shown in FIG. The display screen 21 is a display unit that displays a test pattern received from the tablet terminal 10. The I / F 22 is communicably connected to the tablet terminal 10 in the same manner as the I / F 15 of the tablet terminal 10. The storage unit 16 stores programs and data necessary for the operation of the monitor device 20. For example, the storage unit 16 stores a LUT (Look Up Table) that converts the input data into a display level for displaying on the display screen. The image quality of the display screen 21 can be adjusted by changing the LUT setting according to the evaluation result.

The control unit 200 is a control unit that controls the operation of each unit of the monitor device 20. For example, the control unit 200 receives a test pattern from the tablet terminal 10 via the I / F 22 and controls the received test pattern to be displayed on the display screen 21 at a display level based on the LUT.

<Method of Embodiment 1>
Next, a monitor accuracy management method (evaluation method) according to the present embodiment using the tablet terminal 10 and the monitor device 20 shown in FIGS. 1 to 3 will be described. FIG. 4A is a front external view of the monitor device 20 showing a state in which the monitor accuracy control method according to the present embodiment is being implemented, and FIG. 4B is a sectional view taken along the line AB.

As shown in FIG. 4, in the present embodiment, when the monitor quality control of the monitor device 20 is performed, the tablet terminal 10 is arranged so as to be superimposed on the display screen 21 of the monitor device 20. Specifically, the display screen 21 of the monitor device 20 is fixed in a state of being tilted diagonally in the supine direction (horizontal direction) by the stand 30, and the tablet terminal 10 is placed on the display screen 21. For example, the back side of the tablet terminal 10 on which the out-camera 14 is arranged is placed on the display screen 21.

Then, the lower edge of the tablet terminal 10, that is, the short side end without the out-camera 14, is hooked on the protrusion of the bezel 21a, the end of the tablet terminal 10 comes into contact with the bezel 21a, and the tablet terminal Since the entire back surface of the 10 comes into contact with the display screen 21, the tablet terminal 10 stands still on the display screen 21. At this time, the out-camera 14 of the tablet terminal 10 is located near the center of the display screen 21. That is, the out-camera 14 is fixed in contact with the vicinity of the center of the display screen 21.

When the monitor display quality management software is started on the tablet terminal 10 in this state, the test pattern is transmitted from the tablet terminal 10 to the monitor device 20, and the test pattern is displayed on the display screen 21 of the monitor device 20. The tablet terminal 10 captures a test pattern displayed near the center of the display screen 21 by the out-camera 14, and evaluates the image quality of the image of the captured test pattern. By arranging the front and back of the tablet terminal 10 upside down, the test pattern may be captured by the in-camera 13. Further, as long as the tablet terminal 10 can be imaged in the arranged state, the test pattern may be imaged not only near the center of the display screen 21 but also at an arbitrary position on the display screen 21. For example, the tablet terminal 10 is not limited to the vertical placement as shown in FIG. 4, and the tablet terminal 10 may be placed horizontally to take an image below the center of the display screen 21.

<Effect of Embodiment 1>
As described above, in the present embodiment, the monitor quality management of the monitor device is performed by using the built-in camera of the tablet terminal equipped with the monitor quality management software. As a result, monitor quality control can be easily performed. In addition, it is possible to facilitate the management of the sensor for measuring the brightness and the like, and reduce the load on the user during the measurement work.

Generally, a tablet terminal has a built-in camera unit for shooting an image. In many cases, two cameras called an out-camera are mounted on the back side of the tablet terminal and an in-camera is mounted on the screen side. In the present embodiment, the built-in camera of this tablet terminal is used as a substitute for the external sensor used for monitor accuracy control. Generally, a tablet terminal is composed of a thin, flat housing having no unevenness of 1 cm or less. Therefore, the tablet terminal can be installed in close contact with the display screen of the monitor device subject to monitor accuracy control, whereby the built-in camera of the tablet terminal can be installed in close contact with the display screen of the monitor device. ..

It is said that it is better to measure the display characteristics of the monitor device in the center rather than in the corners of the display screen. The reason is that the influence of the uniformity of the display device can be mitigated. Generally, the screen size of the monitor device and the size of the tablet terminal are often about 2: 1. Further, the camera of the tablet terminal is mounted offset to the corner instead of the center of the housing. In particular, the in-camera is often mounted on the edge of the housing, which is the outside of the display screen. Therefore, when the edge of the tablet terminal is installed so as to be in contact with the bezel of the monitoring device, the built-in camera of the tablet terminal can be installed so as to be located at the center of the display screen of the monitoring device. This is suitable for screen measurement for monitor accuracy control, and measurement can be easily performed at the center of the screen.

Further, in general, many monitoring devices have a structure in which a display device called a panel is covered with a frame-shaped housing called a bezel. Therefore, the bezel portion often protrudes slightly from the panel surface. Further, in general, the monitor device is attached to a stand and has a structure that can be installed stationary, and many of the stands have a tilt mechanism of up, down, left, and right. By using this mechanism and installing the tablet terminal so that it is in contact with the bezel of the monitor device while the display screen of the monitor device subject to monitor quality control is tilted in the supine direction, the tablet terminal can be placed on the bezel of the monitor device. It can be held stably by being caught in the protruding part. That is, the tablet terminal can be stably held and installed on the display screen of the monitor device without being supported by human hands or instruments. It should be noted that the shape of the edge of the housing of the tablet terminal assumed in the present embodiment is a shape designed on the assumption that it is easily caught by the protrusion of the bezel of the monitoring device and is stably held. preferable.

The monitor accuracy management system using the tablet terminal according to the present embodiment has the following advantages as compared with the method using the image interpretation terminal equipped with the monitor accuracy management software and the dedicated external sensor. That is, the monitor quality management system is composed of only a single tablet terminal. As a result, since the terminal, sensor, software, etc. are integrated, maintenance and management can be performed centrally. In addition, since the sensor is not lost and the bullet terminal is lightweight, it is easy to carry. Further, it is not necessary to install monitor quality control software in the image interpretation terminal, and no trouble occurs due to interference with other software.

In addition, system maintenance can be easily performed. Prior to the application of this embodiment, it was necessary for a serviceman to visit the site or for the site administrator to perform maintenance on his own. According to this embodiment, for example, a service for remotely maintaining a monitor quality management system using a tablet terminal can be realized. It is also possible to send back the entire tablet terminal.

In particular, as compared with the case of using a dedicated external sensor, in the present embodiment, the tablet terminal can be installed on the display screen of the monitor device and the measurement position can be easily held. Further, in the held state, the built-in camera of the tablet terminal can reliably measure the central portion of the display screen of the monitoring device.

(Embodiment 2)
Next, the second embodiment will be described. In the present embodiment, an example in which the video signal to be displayed on the monitor device is wirelessly transmitted from the tablet terminal in the configuration of the first embodiment will be described.

<Outline of Embodiment 2>
In the first embodiment, in the measurement of the display characteristics of the monitor device, a test pattern is displayed on the display screen of the monitor device, and the display brightness (or color) of this pattern is measured by a camera built in the tablet terminal (for example, an out-camera). Do it by doing. Since the test pattern to be displayed on the display screen of the monitor device needs to be changed in synchronization with a predetermined measurement sequence, it is displayed under the control of a tablet terminal equipped with monitor quality control software, which is the main body of measurement. It is necessary to have a mechanism to be used. The simplest configuration is to connect the tablet terminal and the monitor device by wire, and input the video signal output from the tablet terminal to the monitor device for display.

However, in general, tablet terminals are often not equipped with terminals for video transmission similar to HDMI (High-Definition Multimedia Interface: registered trademark) ports. Further, although the tablet terminal is equipped with a USB (Universal Serial Bus) port, the monitor device side is often not equipped with a USB video input terminal. In recent years, tablet terminals equipped with a USB-Type C terminal that supports video output as standard have appeared, but it is hard to say that they are widespread.

Further, in the case of "installing the edge of the tablet terminal so as to be in contact with the bezel of the monitoring device" as in the first embodiment, if the external terminal of the tablet terminal is located at the edge portion in contact with the bezel of the monitoring device. If this is the case, there will be a problem that wired connection will be difficult. Therefore, in the present embodiment, the above problem is solved by wirelessly connecting the tablet terminal and the monitor device and wirelessly transmitting the video signal.

<Structure of Embodiment 2>
FIG. 5 shows a configuration example of the monitor quality control system 1 according to the present embodiment. As shown in FIG. 5, the present embodiment includes radio I / F 31 and 32 in addition to the configuration of the first embodiment.

For example, the wireless I / F 31 is built in the tablet terminal 10, and the wireless I / F 32 is an external adapter connected to the I / F 22 of the monitoring device 20. Not limited to this, the wireless I / F 32 may be built in the monitor device 20, or the wireless I / F 31 may be used as an external adapter for the tablet terminal 10.

The wireless I / F 31 and 32 are video wireless transmission devices (wireless communication units) that wirelessly transmit video signals between the tablet terminal 10 and the monitor device 20. The wireless I / F 31 wirelessly transmits a video signal of a test pattern, which is a predetermined image generated by the tablet terminal 10, to the monitor device 20, in this example, the wireless I / F 32 connected to the monitor device 20. Further, the wireless I / F 32 wirelessly receives a video signal from the wireless I / F 31 of the tablet terminal 10 and inputs the received video signal to the monitor device 20.

The video radio transmission technology used in the radio I / F 31 and 32 is not particularly limited, but is, for example, Miracast®. As an example, the wireless I / F 31 is a Miracast transmitter (transmitter), and the wireless I / F 32 is a Miracast receiver (receiver). Miracast transmission is standardly supported on many Android® OS-based tablet terminals, and many Miracast receivers are generally commercially available and may be utilized.

For example, the wireless I / F32 which is a Miracast receiver is connected to the I / F22 which is an HDMI terminal via an HDMI cable. When using Miracast transmission, the wireless I / F31 and the wireless I / F32 are wirelessly connected by Wi-Fi (registered trademark) Direct, and the video signal from the wireless I / F31 is wirelessly connected to the wireless I / F32 by Wi-Fi. Send. The wireless I / F 32 wirelessly receives a video signal from the wireless I / F 31 via Wi-Fi, and inputs the received video signal to the monitor device 20 via an HDMI cable.

Not limited to Miracast, Apple TV (registered trademark), Chromecast (registered trademark), and the like, which are other video / wireless transmission functions similar to Miracast, may be used. Further, not only Wi-Fi (wireless LAN) but also Bluetooth (registered trademark) or the like may be used for wireless connection.

<Method of Embodiment 2>
FIG. 6 shows the flow of the monitor accuracy control method according to the present embodiment. As shown in FIG. 6, first, the tablet terminal 10 is placed in a predetermined position (S101). FIG. 7 shows a mounting example of the tablet terminal 10. As shown in FIG. 7, in the present embodiment, the wireless I / F 32 is connected to the monitor device 20 via an HDMI cable or the like. Similar to the first embodiment, the tablet terminal 10 is placed on the display screen 21 of the monitor device 20 to which the wireless I / F 32 is connected. That is, with the monitor device 20 tilted diagonally, the edge of the tablet terminal 10 is arranged so as to be hooked on the bezel 21a of the monitor device 20, and the out-camera 14 of the tablet terminal 10 is fixed near the center of the display screen 21.

Next, a wireless connection is made between the tablet terminal 10 and the monitoring device 20 (S102). For example, the wireless I / F 31 of the tablet terminal 10 and the wireless I / F 32 connected to the monitoring device 20 are wirelessly connected by Wi-Fi Direct.

Next, the tablet terminal 10 generates a test pattern (S103). For example, when the quality control software is started on the tablet terminal 10, the generation unit 101 generates a predetermined test pattern to be displayed on the monitoring device 20.

Next, the tablet terminal 10 transmits a video signal of the generated test pattern (S104), and the monitoring device 20 receives the transmitted video signal (S105). For example, the wireless I / F 31 of the tablet terminal 10 wirelessly transmits a video signal of a test pattern via the connected Wi-Fi. The wireless I / F 32 wirelessly receives the video signal of the test pattern via the connected Wi-Fi, and inputs the received video signal to the I / F 22 of the monitor device 20.

Next, the monitoring device 20 displays a test pattern on the display screen 21 (S106). When a video signal is input to the I / F 22, the control unit 200 of the monitor device 20 displays a test pattern on the display screen 21 based on the input video signal. At this time, the test pattern is displayed at least at the position where the tablet terminal 10 takes an image (near the center of the display screen 21 in this example). For example, the tablet terminal 10 may specify a position where the test pattern is displayed. The tablet terminal 10 may be arranged according to the position where the test pattern is displayed.

FIG. 8 shows an example of a test pattern generated by the tablet terminal 10 and displayed on the monitoring device 20. This test pattern is a pattern (JIRA BN-01-18) specified in the guidelines for quality control of medical image display monitors (JESRA X-0093 * B-2017). This test pattern is a pattern used for measuring luminance, and is composed of a measurement patch (center square area) and a background as shown in FIG. The measurement patches of the plurality of test patterns correspond to 18 kinds of gray scale gradations from black to white, that is, up to 255 gradations at equal intervals every 15 gradations in order from 0 gradation. Images of these 18 types of test patterns are transmitted from the tablet terminal 10 and sequentially displayed in the center of the display screen 21 of the monitoring device 20.

Next, the tablet terminal 10 captures the test pattern displayed on the monitor device 20 (S107). Similar to the first embodiment, the tablet terminal 10 is placed on the display screen 21 of the monitor device 20, and the test pattern displayed on the display screen 21 is imaged by the out-camera 14 of the tablet terminal 10. At this time, since the out-camera 14 is close to the display screen 21, the out-camera 14 may take a close-up image in a mode such as a macro mode, or the out-camera 14 may be equipped with a close-up lens. For example, the out-camera 14 sequentially captures measurement patches of the 18 types of test patterns shown in FIG. The tablet terminal 10 may display the image captured by the out-camera 14 on the display screen 12 of the tablet terminal 10.

Next, the tablet terminal 10 evaluates the image quality of the image of the captured test pattern (S108). For example, the acquisition unit 102 of the tablet terminal 10 acquires an image of the test pattern captured by the out-camera 14, and the evaluation unit 103 evaluates the brightness and the like of the acquired image. The tablet terminal 10 may display the evaluation result of the evaluation unit 103 on the display screen 12 of the tablet terminal 10.

FIG. 9 shows an example of the luminance characteristics to be evaluated. This luminance characteristic is a characteristic shown in the guideline on quality control of medical image display monitors (JESRA X-0093 * B-2017). For example, in the case of a medical monitor, it is required to display with grayscale characteristics compliant with GSDF (Grayscale Standard Display Function) of DICOM (Digital Imaging and Communication in Medicine) standard. The horizontal axis of FIG. 9 corresponds to the grayscale gradation of the test pattern generated by the tablet terminal 10 and displayed on the monitor device 20. The vertical axis of FIG. 9 corresponds to the brightness of the display screen when displaying a gray scale of a predetermined gradation, and the tablet terminal 10 displays a GSDF curve and 18 types of test patterns as shown in FIG. Compare with the measured brightness. For example, a predetermined luminance characteristic of the GSDF curve is stored in the storage unit 16, and the stored luminance characteristic is compared with the measured value of the test pattern. If the difference between the GSDF curve and the measured value is within the predetermined range, the image quality of the monitor device 20 is judged to be appropriate, and if the difference is outside the predetermined range, the image quality of the monitor device 20 is inappropriate. Judge that there is. In addition, not only the gradation characteristic of the gray scale but also the luminance uniformity, the contrast, the maximum luminance, the luminance ratio, the chromaticity and the like may be evaluated.

<Effect of Embodiment 2>
As described above, in the present embodiment, in the configuration of the first embodiment, the video signal of the test pattern to be displayed on the monitor device is wirelessly transmitted from the tablet terminal. As a result, it is not necessary to connect the tablet terminal and the monitor device by wire, so that the complexity of the connection can be suppressed. In particular, since there are no restrictions due to the position or shape of the external terminal, the video signal of the test pattern can be reliably output in the state of "installing the edge of the tablet terminal so as to be in contact with the bezel of the monitoring device" as in the first embodiment. It can be transmitted wirelessly and the image quality of the monitoring device can be evaluated.

(Embodiment 3)
Next, the third embodiment will be described. In the present embodiment, in the configurations of the first and second embodiments, an example in which the pairing setting is further performed using the image displayed on the monitor device will be described.

<Outline of Embodiment 3>
Generally, when devices are wirelessly connected and managed, pairing between devices is required. In the case of a wired connection, pairing between connected devices is naturally clear, but in the case of a wireless connection, all devices within the reach of wireless radio waves can be candidates for communication. In the case where the medical monitor to be managed and the tablet terminal are wirelessly connected as in the second embodiment, it is assumed that the monitor is used in an environment such as an image reading room. In that case, there is a high possibility that a plurality of monitoring devices installed in the reading room will be managed for one tablet terminal. Therefore, an explicit pairing operation by the user's operation is required, which imposes a heavy burden on the user.

Therefore, in the present embodiment, when the tablet terminal is placed on the monitor device to be managed, the above-mentioned problems are solved by providing a mechanism for automatically pairing the two.

<Structure of Embodiment 3>
FIG. 10 shows a configuration example of the monitor quality control system 1 according to the present embodiment. As shown in FIG. 10, in the present embodiment, in addition to the configuration of the second embodiment, the monitoring device 20 includes a detection unit 24, and the control unit 200 includes a generation unit 201 and a display control unit 202.

The detection unit 24 detects that the tablet terminal 10 is placed on the display screen 21. As the detection means of the detection unit 24, a mechanical means such as a switch may be used, or a sensing means using an optical, electrical, or magnetic sensor may be used.

The generation unit 201 generates a display pattern to be displayed on the display screen 21. For example, the generation unit 201 acquires the identification ID of the radio I / F 32 and generates a blinking pattern based on the identification ID. The identification ID of the wireless I / F 32 may be stored in the storage unit 23. In this example, the identification ID is not only the identification information of the wireless I / F 32 but also the identification information of the monitoring device 20. Not limited to the blinking pattern, an image pattern based on the identification ID may be generated.

The display control unit (display unit) 202 displays the generated display pattern on the display screen 21 when the placement of the tablet terminal 10 is detected. The display control unit 202 displays, for example, a predetermined image in a generated blinking pattern. The image to be displayed may be a test pattern or another image. Further, the blinking display based on the identification ID is not limited, and an image pattern based on the identification ID may be displayed.

In addition to the configuration of the second embodiment, the tablet terminal 10 includes a setting unit 104 in the control unit 100. The setting unit 104 performs pairing setting using the identification ID of the monitor device 20 acquired from the display pattern displayed on the display screen 21 of the monitor device 20. The pairing setting is a setting for identifying the wireless I / F of the connection partner and enabling wireless communication, and a setting for identifying and managing the monitoring device 20 to be managed. That is, the setting unit 104 is also an identification unit that identifies the wireless I / F (monitoring device) of the connection partner based on the acquired identification ID, and also identifies the monitoring device 20 that is the management target (evaluation target). .. Further, in the present embodiment, the acquisition unit 102 acquires the identification ID of the monitor device 20 based on the display pattern captured by the in-camera 13 or the out-camera 14. The generation unit 101 transmits the generated test pattern to the monitoring device 20 set (identified) by the setting unit 104. The evaluation unit 103 evaluates the image quality of the monitor device 20 set by the setting unit 104.

<Method of Embodiment 3>
FIG. 11 shows the flow of the pairing method according to the present embodiment. This method is an evaluation management method for identifying and managing the monitor device 20 by pairing the tablet terminal 10 and the monitor device 20. As shown in FIG. 11, first, when the tablet terminal 10 is placed in a predetermined position (S201), the monitoring device 20 detects the placement of the tablet terminal 10 (S202). Similar to the first and second embodiments, the tablet terminal 10 is placed on the display screen 21 of the monitor device 20. Then, the detection unit 24 of the monitor device 20 becomes. It is detected that the tablet terminal 10 is placed on the display screen 21.

Next, the monitoring device 20 generates a display pattern to be displayed on the display screen 21 (S203). When it is detected that the tablet terminal 10 is placed on the display screen 21, the generation unit 201 acquires the identification ID of the wireless I / F 32 connected to the I / F 22, and determines the acquired identification ID in advance. It encodes with the algorithm and generates a blinking pattern or an image pattern based on the identification ID. It should be noted that the display pattern may be generated and displayed at a timing according to a user operation or the like, not limited to the case where the placement of the tablet terminal 10 is detected. For example, a display pattern is generated at an arbitrary timing before the tablet terminal 10 is placed on the display screen 21, and is generated when it is detected that the tablet terminal 10 is placed on the display screen 21. The display pattern may be displayed.

Next, the monitoring device 20 displays the generated display pattern on the display screen 21 (S204). The display control unit 202 displays a predetermined image such as a test pattern on the display screen 21, and blinks and displays the image in the generated blinking pattern. That is, the luminance is modulated by the blinking pattern based on the identification ID, and the image is blinked from the modulated luminance. Alternatively, the display control unit 202 displays an image pattern such as a two-dimensional bar code based on the identification ID on the display screen 21.

Next, the tablet terminal 10 captures the displayed display pattern (S205) and acquires the identification ID of the monitoring device 20 (S206). Similar to the first and second embodiments, the out-camera 14 of the tablet terminal 10 captures the display pattern displayed on the display screen 21 with the tablet terminal 10 mounted on the display screen 21. Then, the acquisition unit 102 acquires the display pattern captured by the out-camera 14 and decodes the acquired display pattern. For example, the identification ID of the wireless I / F 32 connected to the monitoring device 20 is acquired by decoding (luminance demodulating) the blinking pattern or the image pattern of the captured predetermined image.

Next, the tablet terminal 10 sets the pairing based on the acquired identification ID (S207). The setting unit 104 sets the pairing with the monitor device 20 to be managed by using the acquired identification ID of the wireless I / F 32. After that, as in the second embodiment, the tablet terminal 10 wirelessly connects to the wireless I / F 32 of the monitoring device 20 set for pairing (S208), and evaluates the image quality of the monitoring device 20. That is, the tablet terminal 10 transmits a test pattern to the paired and identified monitor device 20, and evaluates the image quality of the monitor device 20 displaying the transmitted test pattern.

<Effect of Embodiment 3>
As described above, in the present embodiment, in the configurations of the first and second embodiments, the pairing setting is performed using the image displayed on the monitor device. As a result, pairing can be executed without intervention of the user simply by arranging the tablet terminal on the display screen of the monitoring device. Therefore, when the tablet terminal manages a plurality of monitoring devices, the monitoring devices to be managed can be automatically identified, and wireless connection and evaluation processing can be performed.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

Each configuration in the above-described embodiment is composed of hardware and / or software, and may be composed of one hardware or software, or may be composed of a plurality of hardware or software. The function (processing) of each device may be realized by a computer having a CPU, a memory, or the like. For example, a program for performing the method in the embodiment may be stored in the storage device, and each function may be realized by executing the program stored in the storage device on the CPU.

These programs can be stored and supplied to a computer using various types of non-transitory computer readable medium. Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs. Includes CD-R / W, semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

1 Monitor quality control system 10 Tablet terminal 11 Housing 11a Front 11b Back 12 Display screen 13 In-camera 14 Out-camera 15 I / F
16 Storage unit 20 Monitor device 21 Display screen 21a Bezel 22 I / F
23 Storage unit 24 Detection unit 30 Stand 31, 32 Wireless I / F
100 Control unit 101 Generation unit 102 Acquisition unit 103 Evaluation unit 104 Setting unit 200 Control unit 201 Generation unit 202 Display control unit

Claims (5)

A terminal device that evaluates the image quality of a display device.
A wireless communication unit that wirelessly transmits a video signal for displaying a predetermined image to the display device, and
An image pickup unit arranged on the surface of the housing of the terminal device, which is placed on the display screen of the display device at a position where the surface of the housing faces the display screen, and is displayed on the display screen based on the video signal. An image pickup unit that captures the displayed predetermined image, and
An evaluation unit that evaluates the image quality of the display device based on the captured predetermined image, and an evaluation unit.
A terminal device. The evaluation unit evaluates the brightness of the captured predetermined image.
The terminal device according to claim 1. The evaluation unit evaluates the brightness of the predetermined image based on the comparison between the brightness of the captured predetermined image and the predetermined luminance characteristic.
The terminal device according to claim 2. The wireless communication unit wirelessly transmits a video signal displaying a plurality of test patterns corresponding to grayscale gradation.
The terminal device according to any one of claims 1 to 3. The terminal device is an evaluation method for evaluating the image quality of the display device.
A video signal for displaying a predetermined image is wirelessly transmitted to the display device to display the predetermined image.
An image pickup unit arranged on the surface of the housing of the terminal device displays the image on the display screen based on the video signal in a state where the surface of the housing faces the display screen of the display device. I took a predetermined image and
The image quality of the display device is evaluated based on the captured predetermined image.
Evaluation methods.

Images