JP7459723B2 - Evaluation system and evaluation management method - Google Patents

Description

The present invention relates to an evaluation system and an evaluation management method.

In recent years, display devices have become increasingly high-definition and diverse, and there is a demand for display devices to display images with the desired image quality depending on the application. Related monitor devices for PCs (Personal Computers) have a function that allows the image quality to be adjusted to the desired level by varying the display characteristics. Display devices with such image quality adjustment and evaluation functions are used, for example, as medical monitors for reading medical images and DTP (Desktop Publishing) monitors for designing publications.

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

Japanese Patent Application Publication No. 2020-003694

As described above, the technology described in Patent Document 1 makes it possible to evaluate the image quality of a display device by using a luminance sensor. However, the technology described in Patent Document 1 requires a dedicated external sensor that is externally connected to a display device or a PC as a sensor for measuring the luminance of the display screen. For this reason, the technology described in Patent Document 1 has the problem that it is difficult to identify a display device when evaluating the image quality of a display device without using a dedicated external sensor.

The present invention provides an evaluation system including a display device and a terminal device, the display device including a generation unit that generates a display pattern based on identification information of the display device, and a display unit that displays the generated display pattern on a display screen, and the terminal device including an imaging unit arranged on a surface of a housing of the terminal device, the imaging unit imaging the display pattern displayed on the display screen with the surface of the housing placed on the display screen of the display device, an acquisition unit that acquires identification information of the display device based on the captured display pattern, an identification unit that identifies the display device to be evaluated using the acquired identification information, and an evaluation unit that evaluates the image quality of the identified display device based on a predetermined image captured by the imaging unit.

The present invention provides an evaluation management method in an evaluation system including a display device and a terminal device, in which the display device generates a display pattern based on identification information of the display device and displays the generated display pattern on a display screen, and the terminal device uses an imaging unit arranged on the surface of a housing of the terminal device to capture an image of the display pattern displayed on the display screen with the surface of the housing placed on the display screen of the display device, obtains identification information of the display device based on the captured display pattern, identifies the display device to be evaluated using the acquired identification information, and evaluates the image quality of the identified display device based on a predetermined image captured by the imaging unit.

According to the present invention, it is possible to provide an evaluation system and an evaluation management method that can identify a display device when evaluating the image quality of the display device without using a dedicated external sensor.

1 is a configuration diagram showing an external configuration of a tablet terminal according to Embodiment 1. FIG. 1 is a configuration diagram showing an external configuration of a monitor device according to Embodiment 1. FIG. 1 is a configuration diagram showing a configuration of a monitor quality control system according to a first embodiment. FIG. 1 is a diagram for explaining a monitor accuracy management method according to the first embodiment. FIG. FIG. 2 is a configuration diagram showing the configuration of a monitor quality management system according to a second embodiment. FIG. 3 is a sequence diagram illustrating a monitor accuracy management method according to a second embodiment. FIG. 11 is a diagram for explaining a monitor accuracy management method according to the second embodiment. 13 is a diagram showing an example of a test pattern used in the monitor quality control method according to the second embodiment; FIG. FIG. 7 is a diagram illustrating an example of brightness characteristics evaluated by the monitor accuracy management method according to the second embodiment. FIG. 3 is a configuration diagram showing the configuration of a monitor quality management system according to a third embodiment. FIG. 7 is a sequence diagram showing a pairing method according to Embodiment 3;

Embodiments will be described below with reference to the drawings. In each drawing, the same elements are designated by the same reference numerals, and redundant explanation will be omitted if necessary.

(Embodiment 1)
First, Embodiment 1 will be described. In this embodiment, an example will be described in which monitor accuracy management is performed using a tablet terminal. Furthermore, "monitor quality control" or "monitor display quality control" refers to measuring the brightness, etc. of the display screen of a monitor device, and evaluating and managing the image quality of the monitor device. including adjusting the image quality based on the image quality. In this embodiment, as an example of monitor quality management, the image quality of the monitor device is evaluated, but the image quality of the monitor device may be further adjusted.

<Overview of Embodiment 1>
As described above, related technologies require a dedicated external sensor that is externally connected to the monitor device or PC in order to measure the brightness of the monitor device. Since the dedicated external sensor unit is a separate device from the main body of the monitor device, the problem is that it requires separate management. Further, since dedicated external sensors are generally expensive, it is difficult to have as many sensors as there are monitor devices, and it is common practice to share a small number of sensors with multiple monitor devices. Therefore, when carrying out monitor accuracy control work for a medical monitor that performs image interpretation, there is a problem in that each time it is necessary to connect a dedicated external sensor to the target monitor device or PC. Furthermore, when measuring a display screen with a dedicated external sensor, it is necessary to attach the measuring section of the sensor to a predetermined position on the display screen of the monitor device so that it is in close contact with the sensor. This point also causes a burden on the user when using a dedicated external sensor. Therefore, in this embodiment, the above problem can be solved by using the built-in camera of the tablet terminal.

<Configuration of Embodiment 1>
FIG. 1(a) is a front external view of a tablet terminal 10 according to the present embodiment, and FIG. 1(b) is a rear external view thereof. The tablet terminal 10 according to the present embodiment is a tablet terminal equipped with monitor quality management software (evaluation function), and has the same external shape as a general tablet terminal. Note that 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 a similar shape and function.

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

A display screen 12 and an in-camera 13 are provided on the front surface 11a (surface) of the casing 11, and an out-camera 14 is provided on the back surface 11b (surface) of the casing 11. The display screen 12 is a flat display panel (display section) 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 at the center of the front surface 11a of the housing 11. Note that the entire front surface 11a of the housing 11 may be used as the display screen 12, and the in-camera 13 may be disposed at the end of the display screen 12.

The in-camera 13 and the out-camera 14 are imaging units such as a CCD (Charged-coupled devices) camera or a CMOS (Complementary metal-oxide-semiconductor) camera. The in-camera 13 is arranged at any position on the edge (bezel) of the front surface 11a of the housing 11, for example, in the center of one short edge. The out-camera 14 is arranged at an arbitrary position near the edge of the back surface 11b of the housing 11, for example, in the center of the same short edge as the in-camera 13. For example, the out-camera 14 can capture images with higher quality than the in-camera 13, but is not particularly limited. The user can use the tablet terminal 10 by placing it in any direction or holding it. In this 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 in any direction, up, down, right, or left.

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

As shown in FIG. 2, the monitor 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 monitor device 20 includes, for example, a bezel 21a around the display screen 21. The bezel 21a is a convex portion that protrudes from the display screen 21 by about several mm in the thickness direction. 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 substantially right-angled corner. As will be described later, the bezel 21a is a protrusion on which the tablet terminal 10 is hooked and placed when evaluating the monitor device 20. Note that the monitor device 20 does not need to include the bezel 21a, but in that case, it is preferable to provide a protruding member on the edge of the monitor device 20 on which the tablet terminal 10 is placed.

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

Figure 3 shows an example of the configuration of the monitor quality control system 1 according to this embodiment. As shown in Figure 3, the monitor quality control system 1 includes a tablet terminal 10 and a monitor device 20. The monitor quality control system 1 is an evaluation system in which the tablet terminal 10 evaluates the image quality of the monitor device 20. Note that each configuration in Figure 3 is an example, and other configurations may be used as long as the method according to this 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. 1. The in-camera 13 or the out-camera 14 is an imaging unit disposed on either surface of the housing 11 of the tablet terminal 10, and in this embodiment, captures an image displayed on the display screen 21 while being placed in a position where the surface of the housing 11 faces the display screen 21 of the monitor device 20.

The I/F 15 is a communication unit for communicably connecting with the monitor device 20, and the connection method and communication method are not particularly limited. The storage unit 16 is a nonvolatile 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 the monitor quality management program stored in the storage unit 16 and executes the read program to realize each function (process).

The control unit 100 includes, for example, a generation unit 101, an acquisition unit 102, and an evaluation unit 103 as functions realized by a monitor quality management 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 a 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 test pattern image. The evaluation unit 103 evaluates the brightness of the image, for example, but may evaluate not only the brightness but also the color.

The monitor device 20 includes an I/F 22, a storage section 23, and a control section 200 in addition to the display screen 21 shown in FIG. The display screen 21 is a display section that displays the test pattern received from the tablet terminal 10. Like the I/F 15 of the tablet terminal 10, the I/F 22 is communicably connected to 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 an LUT (Look Up Table) that converts input data to a display level for displaying on a display screen. By changing the LUT settings according to the evaluation results, the image quality of the display screen 21 can be adjusted.

The control unit 200 is a control unit that controls the operation of each part 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 display screen 21 to display the received test pattern 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 monitor device 20 shown in FIGS. 1 to 3 will be described. FIG. 4(a) 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. 4(b) is a cross-sectional view taken along the line AB.

As shown in FIG. 4, in this embodiment, when performing monitor accuracy management of the monitor device 20, the tablet terminal 10 is placed over the display screen 21 of the monitor device 20. Specifically, the display screen 21 of the monitor device 20 is fixed with the stand 30 in a diagonally inclined state in the supine direction (horizontal direction), and the tablet terminal 10 is placed on the display screen 21 . For example, the back side of the tablet terminal 10 where 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, and the edge of the tablet terminal 10 comes into contact with the bezel 21a, and the tablet terminal Since the entire back surface of the tablet terminal 10 contacts the display screen 21, the tablet terminal 10 remains stationary on the display screen 21. At this time, the out camera 14 of the tablet terminal 10 is positioned 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.

In this state, when the monitor display quality control software is started on the tablet terminal 10, 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 the test pattern displayed near the center of the display screen 21 with the outer camera 14, and evaluates the image quality of the captured test pattern image. Note that the test pattern may be captured with the inner camera 13 by placing the tablet terminal 10 with the front and back reversed. Also, as long as the tablet terminal 10 can be captured in the position it is placed in, the test pattern may be captured at any position on the display screen 21, not limited to near the center. For example, the tablet terminal 10 is not limited to being placed vertically as in FIG. 4, but may be placed horizontally and the lower side of the center of the display screen 21 may be captured.

<Effects of First Embodiment>
As described above, in this embodiment, the monitor quality control of the monitor device is performed using the built-in camera of the tablet terminal equipped with the monitor quality control software. This makes it possible to easily perform the monitor quality control. In addition, it makes it easier to manage the sensor that measures the luminance, etc., and reduces the burden on the user during the measurement work.

Generally, tablet terminals have a built-in camera unit that captures images. Furthermore, in many cases, two cameras are installed on the back side of the tablet terminal, called an out-camera and an in-camera on the screen side. In this embodiment, the built-in camera of the tablet terminal is used as a substitute for an external sensor used for monitor quality control. Generally, tablet terminals are composed of a thin, flat housing of 1 cm or less and without any irregularities. Therefore, it is possible to install the tablet terminal in close contact with the display screen of the monitor device that is the subject of monitor quality control, and this allows the built-in camera of the tablet terminal to 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 a monitor device at the center of the display screen than at the corners. The reason is that the influence of uniformity of the display device can be alleviated. Generally, the screen size of a monitor device and the size of a tablet terminal are often about 2:1. Furthermore, the camera of the tablet device is mounted offset to the corner of the housing, rather than in the center. In particular, the in-camera is often mounted on the edge of the housing, which is outside the display screen. Therefore, when the edge of the tablet terminal is installed so as to be in contact with the bezel of the monitor device, the built-in camera of the tablet terminal can be installed so as to be located in the center of the display screen of the monitor device. This is suitable for screen measurement for monitor quality control, and allows measurement at the center of the screen to be easily performed.

Moreover, in general, monitor 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. In addition, monitor devices are generally attached to a stand and have a structure that allows them to be installed stationary, and many of the stands have a tilt mechanism up, down, left, and right. By using this mechanism, the display screen of the monitor device subject to monitor quality control is tilted in the upright direction and the tablet terminal is installed so that it touches the bezel of the monitor device, so that the tablet terminal can be stably held by being caught on the protruding part of the bezel of the monitor device. In other words, the tablet terminal can be stably held and installed on the display screen of the monitor device without being supported by hand or equipment. It is preferable that the shape of the edge of the housing of the tablet terminal assumed in this embodiment is designed to be easily caught on the protruding bezel of the monitor device and stably held.

The monitor accuracy management system using a tablet terminal according to the present embodiment has the following advantages over a method using an image interpretation terminal equipped with monitor accuracy management software and a dedicated external sensor. That is, the monitor quality control system is configured with only a single tablet terminal. As a result, since the terminal, sensor, software, etc. are integrated, maintenance and management can be performed in an integrated manner. Furthermore, there is no need to lose the sensor, and the bullet terminal is lightweight, making it easy to carry. Furthermore, there is no need to install monitor quality control software into the image interpretation terminal, and no problems occur due to interference with other software.

Furthermore, maintenance of the system can be easily performed. Before this embodiment was applied, it was necessary for a service person 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 control system using a tablet terminal can be realized. It is also possible to send back the entire tablet device.

In particular, compared to using a dedicated external sensor, in this embodiment, the tablet terminal can be placed on the display screen of the monitor device and the measurement position can be easily maintained. Furthermore, while it is being held in place, the center of the display screen of the monitor device can be reliably measured using the built-in camera of the tablet terminal.

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

<Outline of Second Embodiment>
In the first embodiment, the display characteristics of the monitor device are measured by displaying a test pattern on the display screen of the monitor device and measuring the display brightness (or color) of this pattern with a camera (e.g., an external camera) built into the tablet terminal. 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, a mechanism is required for displaying the test pattern under the control of a tablet terminal equipped with monitor quality control software, which is the subject of measurement. The simplest configuration is to connect the tablet terminal and the monitor device with a wire, and input the video signal output from the tablet terminal to the monitor device for display.

However, tablet terminals are generally not equipped with a video transmission terminal similar to an HDMI (High-Definition Multimedia Interface: registered trademark) port. Further, although tablet terminals are equipped with a USB (Universal Serial Bus) port, monitor devices are often not equipped with a USB video input terminal. In recent years, tablet terminals equipped with USB-Type C terminals that support video output as standard have appeared, but it is difficult to say that they have become widespread.

In addition, when "the edge of the tablet terminal is installed so as to touch the bezel of the monitor device" as in Embodiment 1, if the external terminal of the tablet terminal is located at the edge part that touches the bezel of the monitor device, If this happens, the problem arises that wired connections become difficult. Therefore, in this embodiment, the above problem is solved by wirelessly connecting a tablet terminal and a monitor device and wirelessly transmitting a video signal.

<Configuration of Embodiment 2>
FIG. 5 shows a configuration example of the monitor quality management system 1 according to the present embodiment. As shown in FIG. 5, this embodiment includes wireless I/Fs 31 and 32 in addition to the configuration of Embodiment 1.

For example, the wireless I/F 31 is built into the tablet terminal 10, and the wireless I/F 32 is an external adapter connected to the I/F 22 of the monitor device 20. Note that the present invention is not limited to this, and the wireless I/F 32 may be built into the monitor device 20, or the wireless I/F 31 may be an adapter external to the tablet terminal 10.

The wireless I/Fs 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, to the wireless I/F 32 connected to the monitor device 20. Furthermore, 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 wireless transmission technology used in the wireless I/Fs 31 and 32 is not particularly limited, but is, for example, Miracast (registered trademark). As an example, the wireless I/F 31 is a Miracast transmitter, and the wireless I/F 32 is a Miracast receiver. Miracast transmission is standardly supported by many Android (registered trademark) OS-based tablet terminals, and many Miracast receivers are generally commercially available, and these may be used.

For example, wireless I/F 32, which is a Miracast receiver, is connected to I/F 22, which is an HDMI terminal, via an HDMI cable. When using Miracast transmission, wireless I/F 31 and wireless I/F 32 are wirelessly connected by Wi-Fi (registered trademark) Direct, and a video signal from wireless I/F 31 is wirelessly transmitted to wireless I/F 32 via Wi-Fi. Wireless I/F 32 wirelessly receives a video signal from wireless I/F 31 via Wi-Fi, and inputs the received video signal to monitor device 20 via an HDMI cable.

In addition, instead of Miracast, other video wireless transmission functions similar to Miracast, such as Apple TV (registered trademark) and Chromecast (registered trademark), may be used. Also, instead of Wi-Fi (wireless LAN), wireless connection may be made using Bluetooth (registered trademark), etc.

<Method of Embodiment 2>
FIG. 6 shows the flow of the monitor accuracy management method according to this embodiment. As shown in FIG. 6, first, the tablet terminal 10 is placed in a predetermined position (S101). FIG. 7 shows an example of how the tablet terminal 10 is placed. As shown in FIG. 7, in this embodiment, a wireless I/F 32 is connected to the monitor device 20 via an HDMI cable or the like. As in 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 established between the tablet terminal 10 and the monitor device 20 (S102). For example, the wireless I/F 31 of the tablet terminal 10 and the wireless I/F 32 connected to the monitor device 20 are wirelessly connected via 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 monitor device 20.

Next, the tablet terminal 10 transmits the video signal of the generated test pattern (S104), and the monitor device 20 receives the transmitted video signal (S105). For example, the wireless I/F 31 of the tablet terminal 10 wirelessly transmits a test pattern video signal 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 monitor 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 the test pattern on the display screen 21 based on the input video signal. At this time, the test pattern is displayed at least in the position where the tablet terminal 10 captures the image (in this example, near the center of the display screen 21). For example, the tablet terminal 10 may specify the position where the test pattern is to be displayed. Note that the tablet terminal 10 may be positioned to match 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 monitor device 20. This test pattern is a pattern (JIRA BN-01 to 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 to measure brightness, and as shown in FIG. 8, it is composed of a measurement patch (square area in the center) and a background. The measurement patches of the plurality of test patterns correspond to 18 types of gray scale gradations from black to white, starting from 0 gradation at equal intervals of 15 gradations up to 255 gradations. Images of these 18 types of test patterns are transmitted from the tablet terminal 10 and displayed in sequence at the center of the display screen 21 of the monitor device 20.

Next, the tablet terminal 10 images the test pattern displayed on the monitor device 20 (S107). As in the first embodiment, with the tablet terminal 10 placed on the display screen 21 of the monitor device 20, the out camera 14 of the tablet terminal 10 captures an image of the test pattern displayed on the display screen 21. At this time, since the out camera 14 is close to the display screen 21, the image may be taken in a mode capable of taking close-up shots such as a macro mode, or a close-up lens may be attached to the out camera 14. For example, the out camera 14 sequentially images measurement patches of 18 types of test patterns shown in FIG. Note that the tablet terminal 10 may display an image captured by the outside camera 14 on the display screen 12 of the tablet terminal 10.

Next, the tablet terminal 10 evaluates the image quality of the captured image of the test pattern (S108). For example, the acquisition unit 102 of the tablet terminal 10 acquires an image of the test pattern captured by the outer camera 14, and the evaluation unit 103 evaluates the brightness, etc., 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 brightness characteristic is a characteristic shown in the guidelines for 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 conforming to the GSDF (Grayscale Standard Display Function) of the DICOM (Digital Imaging and Communication in Medicine) standard. The horizontal axis in 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 in 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 the GSDF curve and 18 types of test patterns as shown in FIG. Compare with the measured brightness. For example, a predetermined brightness characteristic of the GSDF curve is stored in the storage unit 16, and the stored brightness characteristic and the measured value of the test pattern are compared. If the difference between the GSDF curve and the measured value is within a predetermined range, it is determined that the image quality of the monitor device 20 is appropriate, and if the difference is outside the predetermined range, the image quality of the monitor device 20 is determined to be inappropriate. I judge that there is. Note that the evaluation is not limited to the gradation characteristics of the gray scale, but may also evaluate brightness uniformity, contrast, maximum brightness, brightness ratio, chromaticity, etc.

<Effects of the Second Embodiment>
As described above, in this embodiment, in the configuration of embodiment 1, the video signal of the test pattern to be displayed on the monitor device is wirelessly transmitted from the tablet terminal. This eliminates the need for a wired connection between the tablet terminal and the monitor device, making it possible to reduce the complexity of the connection. In particular, since there are no restrictions due to the position or shape of the external terminal, it is possible to wirelessly transmit the video signal of the test pattern reliably and evaluate the image quality of the monitor device in a state where "the edge of the tablet terminal is placed in contact with the bezel of the monitor device" as in embodiment 1.

(Embodiment 3)
Next, Embodiment 3 will be described. In this embodiment, an example in which pairing settings are further performed using an image displayed on a monitor device in the configurations of Embodiments 1 and 2 will be described.

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

Therefore, in this embodiment, we aim to solve the above problem by providing a mechanism that automatically pairs the tablet device and the monitor device to be managed when the tablet device is placed on the monitor device.

<Configuration of Third Embodiment>
Fig. 10 shows an example of the configuration of the monitor quality control system 1 according to the present embodiment. As shown in Fig. 10, in addition to the configuration of the second embodiment, in the present embodiment, the monitor 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 has been placed on the display screen 21. The detection means of the detection unit 24 may be a mechanical means such as a switch, or may be a sensing means using an optical, electrical, or magnetic sensor.

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 wireless 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 the identification information of the wireless I/F 32 and also the identification information of the monitor device 20. Note that the present invention is not limited to the blinking pattern, and an image pattern based on the identification ID may be generated.

When the placement of the tablet terminal 10 is detected, the display control unit (display unit) 202 displays the generated display pattern on the display screen 21. For example, the display control unit 202 displays a predetermined image in the generated blinking pattern. The image to be displayed may be a test pattern or another image. Furthermore, the display is not limited to a blinking display based on the identification ID, 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 is also a setting for identifying the monitor device 20 to be managed and enabling management. That is, the setting unit 104 is an identification unit that identifies the wireless I/F (monitor device) of the connection partner based on the acquired identification ID, and also identifies the monitor device 20 to be managed (evaluated). In this 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 monitor 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 Third Embodiment>
Fig. 11 shows the flow of the pairing method according to this embodiment. This method is an evaluation management method for identifying and managing the monitoring device 20 by pairing the tablet terminal 10 and the monitoring 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). As in the first and second embodiments, the tablet terminal 10 is placed on the display screen 21 of the monitoring device 20. Then, the detection unit 24 of the monitoring device 20 detects that the tablet terminal 10 has been placed on the display screen 21.

Next, the monitor device 20 generates a display pattern to be displayed on the display screen 21 (S203). When detecting 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 converts the acquired identification ID into a predetermined number. A blinking pattern or image pattern is generated based on the identification ID. Note that the display pattern may be generated and displayed not only when the placement of the tablet terminal 10 is detected but also at a timing corresponding to a user operation or the like. For example, a display pattern is generated at an arbitrary timing before the tablet terminal 10 is placed on the display screen 21, and when it is detected that the tablet terminal 10 is placed on the display screen 21, the display pattern is generated. A display pattern may also be displayed.

Next, the monitor 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 displays this image blinking in a generated blinking pattern. That is, the brightness is modulated with a blinking pattern based on the identification ID, and the image is caused to blink based on the modulated brightness. Alternatively, the display control unit 202 displays an image pattern such as a two-dimensional barcode based on the identification ID on the display screen 21.

Next, the tablet terminal 10 captures an image of the displayed display pattern (S205), and acquires the identification ID of the monitor device 20 (S206). Similar to Embodiments 1 and 2, with the tablet terminal 10 placed on the display screen 21, the out camera 14 of the tablet terminal 10 images the display pattern displayed on the display screen 21. Then, the acquisition unit 102 acquires the display pattern imaged 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 monitor device 20 is acquired by decoding (brightness demodulation) the blinking pattern or image pattern of a predetermined captured image.

Next, the tablet terminal 10 performs pairing settings based on the acquired identification ID (S207). The setting unit 104 uses the acquired identification ID of the wireless I/F 32 to perform pairing settings with the monitor device 20 to be managed. After that, similarly to the second embodiment, the tablet terminal 10 establishes a wireless connection with the wireless I/F 32 of the monitor device 20 that has been paired (S208), and evaluates the image quality of the monitor device 20. That is, the tablet terminal 10 transmits a test pattern to the monitor device 20 that has been paired and identified, and evaluates the image quality of the monitor device 20 that displays the transmitted test pattern.

<Effects of Third Embodiment>
As described above, in this embodiment, in the configurations of the first and second embodiments, pairing is set up using an image displayed on a monitor device. This allows pairing to be performed without user operation by simply placing a tablet terminal on the display screen of a monitor device. Therefore, when a tablet terminal manages multiple monitor devices, it can automatically identify the monitor device to be managed and perform wireless connection and evaluation processing.

Note that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit.

Each component in the above-described embodiments may be configured with hardware or software, or both, and may be configured with one piece of hardware or software, or may be configured with multiple pieces of hardware or software. The functions (processing) of each device may be realized by a computer having a CPU, memory, etc. For example, a program for performing the method in the embodiment may be stored in a storage device, and each function may be realized by executing the program stored in the storage device with a CPU.

These programs can be stored and provided to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media includes various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The program may also be supplied to the computer on various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can provide the program to the computer via wired communication channels, such as electrical wires and optical fibers, or wireless communication channels.

1 Monitor quality control system 10 Tablet terminal 11 Housing 11a Front surface 11b Rear surface 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 (4)

An evaluation system including a display device and a terminal device,
The display device includes:
a generation unit that generates a predetermined image including a test pattern for evaluating image quality of the display device and a display pattern based on identification information of the display device ;
a display unit that displays the predetermined image on a display screen;
a detection unit that detects that a housing of the terminal device is placed on the display screen,
The terminal device
an imaging unit disposed on a surface of a housing of the terminal device, the imaging unit imaging the predetermined image displayed on the display screen in a state where the surface of the housing is placed on a display screen of the display device;
an acquisition unit that acquires identification information of the display device based on the predetermined image captured by the imaging unit ;
an identification unit that identifies a display device to be evaluated using the identification information acquired by the acquisition unit ;
an evaluation unit that evaluates the image quality of the identified display device based on the predetermined image captured by the imaging unit;
Equipped with
The display unit of the display device displays the predetermined image when the detection unit detects that a housing of the terminal device has been placed on the display screen. The display pattern is a blinking pattern based on the identification information,
the display unit displays the predetermined image in a blinking pattern based on the identification information.
The evaluation system according to claim 1 . The display pattern is an image pattern based on the identification information.
The evaluation system according to claim 1 . A method for managing evaluations in an evaluation system including a display device and a terminal device, comprising:
The display device includes:
generating a predetermined image including a test pattern for evaluating image quality of the display device and a display pattern based on identification information of the display device ;
When it is detected that the housing of the terminal device is placed on a display screen, the predetermined image is displayed on the display screen;
The terminal device
an imaging unit disposed on a surface of a housing of the terminal device captures the predetermined image displayed on the display screen of the display device in a state in which the surface of the housing is placed on the display screen of the display device;
acquiring identification information of the display device based on the captured predetermined image ;
Using the acquired identification information, the display device to be evaluated is identified;
evaluating the image quality of the identified display device based on the predetermined image captured by the imaging unit;
Evaluation management methods.

Images