JP7080059B2 - Broadcast monitor unevenness detection device and unevenness correction system using the device - Google Patents

Description

The present invention relates to an unevenness detection device for a broadcasting monitor and an unevenness correction system using the device.

Broadcast monitors currently used in the world (hereinafter referred to as monitors) have different emission characteristics for each pixel position on the panel, so even if video signals of the same color or intensity are input, they will be input. It does not always emit exactly the same light throughout the panel. Further, the difference in light emission characteristics differs not only depending on the position on the panel but also on each panel. Therefore, in the process of manufacturing the monitor, each manufacturer executes a function called unevenness correction in order to make the position of the pixel of the panel or the light emission condition for each specific area uniform. Therefore, the result of unevenness correction can be different for all panels.

This unevenness correction method inputs input video data of uniform brightness and color to the monitor, outputs the video to the entire panel of the monitor, and measures the brightness of the output video in a dark room such as a color brightness meter or a dedicated camera. (See, for example, Patent Documents 1 and 2), a process of generating correction data so that the brightness of the uneven portion becomes uniform with the surrounding brightness and reflecting the correction data on the monitor. To execute. Thereby, the monitor adds a correction signal based on the correction data to each pixel or area of the panel.

FIG. 1 shows an example of a conventional unevenness detection method using a color luminance meter. In the unevenness correction method shown in FIG. 1, an output image based on input image data of uniform brightness and color is displayed on the entire panel of the monitor 1 in a dark room, and the measurer picks up the probe 2a of the color luminance meter 2. Hold it close to the panel of the monitor 1 to a distance of about ten cm, measure the brightness of the output image displayed on the entire panel while changing the position of the probe 2a, and detect unevenness from the brightness distribution.

FIG. 2 shows an example of a conventional unevenness detection method using a camera. In the unevenness correction method shown in FIG. 2, an output image based on input image data of uniform brightness and color is displayed on the entire panel of the monitor 1 in a dark room, and the brightness of the entire panel is measured by the camera 3. Unevenness is detected from the brightness distribution.

Japanese Unexamined Patent Publication No. 2009-260731 Japanese Unexamined Patent Publication No. 2016-004037

However, the conventional unevenness detection method as described above has the following problems.

(1) First, since the conventional unevenness detection method described above must be performed in a completely dark room, a space and equipment dedicated to the dark room are required.

(2) In the case of the conventional unevenness detection method using a color luminance meter, the range that can be measured at one time is limited because the probe 2a is held by the measurer and brought close to the vicinity of the panel of the monitor 1 by a dozen centimeters. Will end up. Therefore, in order to measure the whole, it is necessary to change the position of the probe 2a and repeat the measurement many times, and it is necessary to manually adjust the measurement position and angle by the probe 2a. Therefore, there is a problem that not only the result may be different for each measurement, but also the measurement per panel takes time.

(3) In the case of the conventional unevenness detection method using a dedicated camera, the measurer manually translates the camera 3 in three directions of XYZ in order to fix the viewpoint of the camera 3 to the center of the panel of the monitor 1. Since it must be rotated in three directions, there is a problem that an error occurs in the measurement result for each measurement. Further, if the camera 3 is brought too close to the monitor 1, the light entering the camera 3 does not become vertical and the amount of light changes between the center and the edge of the panel of the monitor 1, so that accurate measurement cannot be performed, and the camera 3 is monitored by the monitor 1. If it is too far away, the amount of light will be weakened, so the measurement time must be increased. Therefore, since it takes a very long time to adjust the position, there is a problem that it takes time to measure one panel.

The present invention has been made in view of the above problems, and it is not necessary to prepare a separate dark room for measurement, and an unevenness detection device capable of performing accurate measurement without error by a simple method in a short time is possible. And an object of the present invention is to provide an unevenness correction system using the device.

In order to solve the above problems, the unevenness detecting device according to the embodiment of the present invention is an unevenness detecting device for detecting unevenness of an image displayed on a monitor panel, and has a housing having an opening. A monitor mounting frame having a mounting port configured to allow the monitor to be mounted without a gap and being configured to be mounted without a gap in the opening of the housing, and a monitor mounting frame mounted in the opening. When the monitor is attached to the monitor mounting portion, a sensor unit including a plurality of light receiving sensors provided in the housing so as to face the panel of the monitor, and a communication / control unit are provided. The communication / control unit is characterized in that it determines whether or not the difference between the measured value of each light receiving sensor of the sensor unit and the predetermined reference value exceeds a predetermined threshold value.

The unevenness correction system according to an embodiment of the present invention is an unevenness correction system using the unevenness detection device according to any one of claims 1 to 4, wherein the communication / control unit receives light from each sensor unit. When it is determined that any of the measured values of the sensor exceeds the predetermined threshold value, it is a correction value for the measurement area of the panel in the light receiving sensor that outputs the measured value exceeding the threshold value, and is the correction value of the sensor unit. It is characterized in that a correction value signal including a correction value such that the measurement value in each light receiving sensor becomes the predetermined reference value is output to the monitor.

According to the present invention, since the position of the monitor is fixed only by attaching the monitor to the monitor mounting frame, the time for adjusting the position of the monitor can be reduced and the manual error can be eliminated, so that the accuracy is improved. Can be made to. In addition, since the inside of the device is completely shielded from light, the inside of the device can be in a completely dark room state, and measurement can be performed in the device in the completely dark room state, so it is necessary to prepare a separate dark room for measurement. It is possible to inspect on the spot when the monitor is installed, and it is possible to reduce the time and cost required for detecting or correcting unevenness on the monitor.

It is a figure which shows an example of the conventional unevenness detection method using a color luminance meter. It is a figure which shows an example of the conventional unevenness detection method using a camera. It is a figure which illustrates the unevenness detection apparatus which concerns on embodiment of this invention. It is a figure which shows the monitor mounting frame which has the mounting opening of a different size for each panel size of a monitor in the unevenness detection apparatus which concerns on embodiment of this invention. It is a figure which illustrates the structure of the sensor part in the unevenness detection apparatus which concerns on embodiment of this invention. It is a flow figure which illustrates the unevenness detection method in the unevenness detection apparatus which concerns on embodiment of this invention. It is a figure which illustrates the method of determining the light receiving sensor used in the sensor part in the unevenness detection apparatus which concerns on embodiment of this invention.

(Example)
The unevenness detection apparatus according to the embodiment of the present invention will be described with reference to FIG. FIG. 3A is a cross-sectional view of the unevenness detection device according to the embodiment of the present invention, and FIG. 3B is a perspective view of the unevenness detection device according to the embodiment of the present invention. 3A and 3B show a housing 101, a monitor mounting frame 102 that can be attached / detached to / from the housing 101, and a monitor mounting frame 102 that can be attached / detached to the monitor 150, and a plurality of light receivers. An unevenness detection device including a sensor unit 103 having sensors 103 _1,1 to 103 _{n, m} and a communication / control unit 104 is shown.

FIG. 3C is a diagram showing a state in which the monitor mounting frame 102 is removed from the housing 101 and the monitor 150 is removed from the monitor mounting frame 102 in the unevenness detection device according to the embodiment of the present invention. As shown in FIG. 3C, the housing 101 has an opening 101a, and the monitor mounting frame 102 has a mounting port 102a configured so that the monitor 150 can be mounted without a gap. The opening 101a of the housing 101 and the monitor mounting frame 102 are configured so that the monitor mounting frame 102 can be mounted without a gap in the opening 101a of the housing 101.

A sensor unit 103 is provided at the innermost part of the opening 101a of the housing 101, and the monitor mounting frame 102 is attached to the opening 101a without a gap, and the monitor 150 is attached to the monitor mounting frame 102 without a gap. As shown in 3 (a), the space partitioned by the housing 101, the monitor mounting frame 102, the sensor unit 103, and the monitor 150 constitutes a darkroom space 110 that is a completely darkroom state in which ambient light is not incident.

Further, in a state where the monitor mounting frame 102 is attached to the opening 101a and the monitor 150 is attached to the monitor mounting frame 102, the sensor unit 103 receives light from the panel of the monitor 150 vertically to each light receiving sensor of the sensor unit 103. It is placed close to the monitor so that it is incidental. Although it depends on the number of each light receiving sensor in the sensor unit 103, the distance between the monitor mounting frame 102 and the sensor unit 103 can be, for example, about 3 cm. The sensor unit 103 may not be arranged so that the light from the panel is incident exactly vertically. Although it depends on the characteristics of the light receiving sensor, it is permissible for the light from the panel to enter the sensor unit 103 in a state where the light is tilted from 90 ° to, for example, ± 0.2 ° to 0.3 °.

The housing 101 houses the sensor unit 103 and the communication / control unit 104. It is preferable that the housing 101 is configured to have a size that can accommodate the monitor having the largest size on the production line as it is. The housing 101 can have a size of, for example, about 80 cm × 55 cm × 30 cm.

The monitor mounting frame 102 is such that the center of the monitor 15 is positioned at the center of the sensor unit 103 by, for example, fitting the monitor 150 into the mounting port 102a with the panel of the monitor 150 facing the opening 101a side. The position can be fixed.

FIG. 4 is a diagram showing a monitor mounting frame having mounting openings having different sizes for each monitor panel size. Since the size of the monitor 150 is predetermined with diagonal dimensions such as 17 inches, 24 inches, and 31 inches, the monitor 150 can be mounted without a gap for each size of the monitor 150 as shown in FIG. By preparing the monitor mounting frame 102, it is possible to use a monitor having a size suitable for the size of the monitor 150.

Different measurement areas are assigned to the light receiving sensors 103 _1,1 to 103 _{n, m} in the panel of the monitor 150, and the entire panel is covered by the all light receiving sensors 103 _1,1 to 103 _{n, m} . Since the sensor unit 103 and the monitor 150 are configured to be close to each other, the light from the panel of the monitor 150 is vertically incident on the light receiving sensors 103 1, ₁ to 103 _{n, m} of the sensor unit 103. Accurate measurement is possible by using the measurement value of the light receiving sensor closest to each pixel position of the monitor 150. The light receiving sensor of the sensor unit 103 can be, for example, a luminance sensor or a color detection sensor.

FIG. 5 illustrates the configuration of the sensor unit 103 in the unevenness detection device according to the embodiment of the present invention. As shown in FIG. 5, the sensor unit 103 may have, for example, a configuration in which a plurality of light receiving sensors 103 _1,1 to 103 _{n, m} are arranged in a grid pattern. The sensor unit 103 can be composed of, for example, 32 light receiving sensors 103 _1,1 to 103 _{n, m} in the horizontal direction and 18 in the vertical direction.

FIG. 3D shows the system configuration of the unevenness detection device according to the embodiment of the present invention. As shown in FIG. 3D, the communication / control unit 104 is, for example, a CPU that performs arithmetic processing and other arithmetic processing according to this embodiment, a memory for storing / executing a CPU program, and a PC. It is possible to implement a communication interface for communicating with an external device such as, receiving a measured value from the sensor unit 103, and transmitting / receiving a signal for controlling the monitor 150 by transmitting a correction signal. The communication / control unit 104 can transmit a correction signal to the monitor 150 via an external device such as a PC, or cause an external device such as a PC to display, for example, a detection result and a correction result.

The monitor 150 is not particularly limited, but can be controlled from the outside and can display a test image for measurement, and is equipped with an unevenness correction processing unit that performs correction by applying a transmitted correction value signal. Can be assumed to be.

FIG. 6 illustrates an unevenness detecting method in the unevenness detecting apparatus according to the embodiment of the present invention. Each step shown in FIG. 6 is assumed to be executed by the communication / control unit 104, and the sensor unit 103 is composed of n light receiving sensors 103 _1,1 to 103 _{n, m} in the horizontal direction and m in the vertical direction. It is assumed that it is.

In step S601, a test video display signal for displaying the test video for measurement on the panel is transmitted to the monitor 150. In this test video, for example, when measuring brightness, all whites are output to the entire panel at the same signal level, and when measuring color, red, green, and blue of the same signal level are output to the entire panel. be able to. After the test image is displayed on the panel of the monitor 150, the measurement by the sensor unit 103 is started.

In step S602, the measured values are acquired from the light receiving sensors 103 _1,1 to 103 _{n, m} of the sensor unit 103 and held in the memory. The measurement parameters can be, for example, illuminance, color, brightness, and the like.

In step S603, it is determined whether or not the difference between the measured values of the light receiving sensors 103 1, ₁ to 103 _{n, m} and the predetermined reference values exceeds a predetermined threshold value. The predetermined reference value used in step S603 may be the average value of all the measurement data of the light receiving sensors 103 1, ₁ to 103 _{n, m} , but is not limited to this and can be appropriately set. If it is determined in step S603 that the difference between each measured value and the reference value exceeds a predetermined threshold value, the process proceeds to step S604.

In step S604, the correction value for the measurement area of the panel in the light receiving sensor that outputs the measured value whose difference from the reference value exceeds a predetermined threshold value, and the correction value so that the measured value of the light receiving sensor becomes the reference value. Calculate the value and keep it in memory. In step S604, for example, the correction value of the measurement parameter for the numerical value of the difference between the reference value and the measured value is predetermined as the unit correction value, and the difference between the reference value and the actual measured value is the numerical value of the difference in the unit correction value. The correction value may be calculated from the ratio by dividing by. However, the calculation method of the correction value is not limited to this, and various methods can be adopted depending on the application and the like.

In step S605, a correction value signal including the correction value calculated in step S604 is transmitted to the monitor 150 to reflect the correction result. In step S605, the monitor 150 can apply the correction value to each pixel or for each pixel in a certain range. After that, the process returns to step S602, and the measurement is performed again in step S602. The loop of steps S602 to S605 is repeated in step S603 until no measurement value exceeding the threshold value appears.

When it is determined in step S603 that the difference between each measured value and the reference value does not all exceed a predetermined threshold value, it is determined that there is no unevenness in the image of the panel, for example, the above measurement result, correction result, and the like. The judgment result etc. is output to the external PC and the process ends. It is possible to display the result transmitted from the unevenness detection device by characters or other means by an external PC or the like.

Here, before starting the measurement by the sensor unit 103, the light receiving sensor to be used is selected from the light receiving sensors 103 _1,1 to 103 _{n, m} of the sensor unit 103 based on the size of the panel of the monitor 150. The step may be executed, and the above steps S602 to S605 may be executed using the selected light receiving sensor. As a result, by selecting the light receiving sensor to be used in the sensor unit 103, measurement can be performed even with monitors having different sizes.

FIG. 7 is a diagram illustrating a method for determining a light receiving sensor to be used in the sensor unit 103. As described above, the size of the monitor is predetermined to have diagonal dimensions of, for example, 17 inches, 24 inches, and 31 inches. Therefore, as shown in FIG. 7, the size of the monitor is, for example, for 24 inches or 31 inches. The light receiving sensor to be used in the sensor unit 103 may be determined in advance for each.

In this case, for example, the communication / control unit 104 may select the light receiving sensor to be used by receiving the selection input of the light receiving sensor according to the size of the monitor via an external PC or the like. Further, as shown in FIG. 4, a monitor mounting frame having different size mounting ports is prepared for each monitor size, and a light receiving sensor used in the sensor unit 103 for each size of the mounting port of the monitor mounting frame 102. Is determined in advance, an identification code for identifying the predetermined light receiving sensor is added to the monitor mounting frame 102, and the mounting frame 102 is automatically identified by a reading unit (not shown) when the mounting frame 102 is mounted on the housing 101. By reading the code, the communication / control unit 104 may automatically select the light receiving sensor to be used.

According to the unevenness detection device according to the embodiment of the present invention and the unevenness correction system using the device, the position fixing of the monitor is completed only by attaching the monitor to the monitor mounting frame, so that the time for adjusting the position of the monitor can be reduced. At the same time, manual errors can be eliminated, so accuracy can be improved. In addition, since the inside of the unevenness detection device is completely shielded from light, the inside of the device can be in a completely dark room state, and measurement can be performed in the device in the completely dark room state, so a separate dark room is prepared for measurement. It is possible to inspect the monitor on the spot without the need for it, and it is possible to reduce the time and cost required for detecting and correcting unevenness on the monitor.

Claims (5)

An unevenness detection device for detecting unevenness in the image displayed on the monitor panel.
A housing with an opening and
A monitor mounting frame having a mounting port configured to allow the monitor of a predetermined size to be mounted without a gap, and being configured to be mounted to the opening of the housing without a gap.
A sensor including a plurality of light receiving sensors provided in the housing so as to face the panel of the monitor when the monitor of the predetermined size is attached to the mounting port and the monitor mounting frame is attached to the opening. Department and
It is determined whether or not the difference between the measured value by the light receiving sensor selected according to the size of the monitor from the plurality of light receiving sensors included in the sensor unit and the predetermined reference value exceeds a predetermined threshold value. Communication / control unit and
The light receiving sensor used for measuring the measured value is selected based on the identification information of the monitor mounting frame . The unevenness detection device according to claim 1, wherein the light from the panel of the monitor is vertically incident on each of the selected light receiving sensors. The plurality of light receiving sensors are arranged in a grid pattern .
The unevenness detecting apparatus according to claim 1 or 2. The unevenness detection device according to any one of claims 1 to 3, wherein the light receiving sensor is a luminance sensor or a color detection sensor. An unevenness correction system using the unevenness detection device according to any one of claims 1 to 4.
When it is determined that the measured value of any of the light receiving sensors of the sensor unit exceeds the predetermined threshold value, the communication / control unit measures the panel of the light receiving sensor that outputs the measured value exceeding the threshold value. An unevenness correction system characterized in that a correction value signal including a correction value which is a correction value for a region and includes a correction value such that the measured value in each light receiving sensor of the sensor unit becomes the predetermined reference value is output to the monitor. ..

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