JP2019124467A - Unevenness detection device for broadcast monitor and unevenness correction system using the same - Google Patents

Abstract

To provide an unevenness detection device capable of accurate measurement in a short time without errors and no need to prepare a separate dark room, and an unevenness correction system using the device.SOLUTION: The present invention is an unevenness detection device for detecting unevenness of an image displayed on a panel of a monitor, comprising; a housing having an opening; a monitor attachment frame having an attachment port configured to be able to attach the monitor without a gap, and configured to be attached without a gap in the opening of the housing; a sensor unit including a plurality of light receiving sensors provided in the housing so as to face the panel of the monitor when the monitor attachment frame is attached to the opening and the monitor is attached to a monitor attachment; and a communication/control unit that determines whether the difference between a measured value of each light receiving sensor of the sensor unit and a predetermined reference value exceeds a predetermined threshold value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an apparatus for detecting unevenness of a broadcast monitor and an unevenness correction system using the apparatus.

  Currently, broadcast monitors used in the world (hereinafter referred to as "monitors") have different emission characteristics for each pixel position on the panel, so even if they input video signals of the same color or intensity, It does not necessarily emit light exactly the same across the entire panel. Moreover, the difference in light emission characteristics differs not only by the position on the panel but also by each of the panels. Therefore, in the process of manufacturing the monitor, each manufacturer performs a function of unevenness correction in order to equalize the position of the pixels of the panel or the degree of light emission for each specific area. Therefore, the result of unevenness correction may be different for every panel.

  In this unevenness correction method, input image data of uniform brightness and color is input to the monitor, the image is output on the entire panel of the monitor, and the luminance of the output image is stored in a dark room such as a color luminance meter or a dedicated camera Processing that generates correction data such that the brightness of the uneven part becomes uniform with the surrounding brightness by measuring using the measurement device of (1) and causes the monitor to reflect the correction data Run. Thereby, the monitor applies 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, the output image based on the input image data of uniform brightness and color is displayed on one panel of the monitor 1 in the dark room, and the measurer uses the probe 2a of the color luminance meter 2 It is brought close to the vicinity of the panel of the monitor 1 up to nearly a dozen centimeters, the brightness of the output image displayed on the entire panel is measured while changing the position of the probe 2a, and unevenness is detected 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 one panel of the monitor 1 in a dark room, and the camera 3 measures the luminance of the entire panel. Unevenness is detected from the luminance distribution.

JP, 2009-260731, A JP, 2016-004037, A

  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 complete dark room, 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 measurer holds the probe 2a in hand and brings it close to the vicinity of the panel of the monitor 1 to nearly a dozen cm, so the measurable range at one time is limited. It will 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 also necessary to manually adjust the measurement position and angle by the probe 2a. Therefore, not only the result may be different for each measurement, but also there is a problem that the measurement per panel takes a long time.

  (3) In the case of the conventional unevenness detection method using a dedicated camera, in order to fix the viewpoint of the camera 3 at the center of the panel of the monitor 1, the measurer manually translates the camera 3 in three directions of XYZ. Since it is necessary to rotate in three directions, there is a problem that an error occurs in the measurement result every measurement. Also, if the camera 3 is too close to the monitor 1, the light entering the camera 3 will not be vertical and the amount of light will change between the center and the edge of the panel of the monitor 1, so accurate measurements can not be made. If the distance is too far, the amount of light becomes weak, so the measurement time must be increased. Therefore, there is a problem that it takes time for measurement per panel because it takes a very long time for position adjustment.

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

  In order to solve the above-mentioned subject, the unevenness detection device concerning one embodiment of the present invention is an unevenness detection device for detecting the unevenness of the picture displayed on the panel of a monitor, and the case which has an opening and A monitor mounting frame having a mounting port configured to mount the monitor without a gap, and configured to be mounted to the opening of the housing without a gap; and the monitor mounting frame mounted to the opening. A sensor unit including a plurality of light receiving sensors provided in the housing so as to face the panel of the monitor when the monitor is attached to the monitor attachment unit; a communication / control unit; The communication / control unit is characterized by determining whether or not a difference between a measured value of each light receiving sensor of the sensor unit and a predetermined reference value exceeds a predetermined threshold value.

  An unevenness correction system according to an embodiment of the present invention is the unevenness correction system using the unevenness detection device according to any one of claims 1 to 4, wherein the communication / control unit is configured to receive each light from the sensor unit. When it is determined that any measurement value 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 has output the measurement value exceeding the threshold value, A correction value signal including a correction value such that a measurement value of each light receiving sensor becomes the predetermined reference value is output to the monitor.

  According to the present invention, since the fixation of the position of the monitor is completed only by attaching the monitor to the monitor attachment frame, the time for adjusting the position of the monitor can be reduced and the manual error can be eliminated, thereby improving the accuracy. It can be done. In addition, since the inside of the apparatus is completely shielded from light, the inside of the apparatus can be completely darkened, and measurement can be performed in the completely darkened apparatus, so it is necessary to prepare a separate darkroom for measurement. In addition, inspection can be performed on the spot where it is attached, and it becomes possible to reduce the time and cost required to perform unevenness detection or unevenness correction of the monitor.

It is a figure which shows an example of the conventional nonuniformity detection method using a color luminance meter. It is a figure which shows an example of the conventional nonuniformity detection method which used the camera. It is a figure which illustrates the unevenness detection device concerning the example of the present invention. In the unevenness detection device concerning the example of the present invention, it is a figure showing the monitor attachment frame which has the attachment mouth of a size different for every panel size of a monitor. It is a figure which illustrates the composition of the sensor part in the unevenness detection device concerning the example of the present invention. It is a flowchart which illustrates the unevenness detection method in the unevenness detection device concerning the example of the present invention. In the unevenness detection device concerning the example of the present invention, it is a figure which illustrates the determination method of the light reception sensor used in a sensor part.

(Example)
An unevenness detection apparatus according to an embodiment of the present invention will be described with reference to FIG. Fig.3 (a) is sectional drawing of the nonuniformity detection apparatus which concerns on the Example of this invention, FIG.3 (b) is a perspective view of the nonuniformity detection apparatus which concerns on the Example of this invention. In FIGS. 3A and 3B, the housing 101 and the monitor mounting frame 102 attachable to and removable from the housing 101 and configured to be attachable to and detachable from the monitor 150, and a plurality of light receptions. An unevenness detection device is shown that includes a sensor unit 103 having sensors 103 _{1, 1 to} 103 _{n, m} , and a communication / control unit 104.

  FIG. 3C is a view showing a state in which the monitor attachment frame 102 is removed from the housing 101 and the monitor 150 is removed from the monitor attachment 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 to be able to mount the monitor 150 without a gap. The opening 101 a of the housing 101 and the monitor mounting frame 102 are configured so that the monitor mounting frame 102 can be attached to the opening 101 a of the housing 101 without a gap.

  The sensor unit 103 is provided at the deepest portion 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 FIG. 3A, the space partitioned by the housing 101, the monitor attachment frame 102, the sensor unit 103, and the monitor 150 constitutes a dark room space 110 which is a complete dark room state in which disturbance light is not incident.

  Further, in a state where the monitor attachment frame 102 is attached to the opening 101a and the monitor 150 is attached to the monitor attachment frame 102, the sensor unit 103 makes the light from the panel of the monitor 150 perpendicular to each light receiving sensor of the sensor unit 103. It is placed close to the monitor to be incident. Although depending on the number of light receiving sensors 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 disposed so that the light from the panel may be exactly vertically incident. Depending on the characteristics of the light receiving sensor, it is acceptable that the light from the panel may be incident on the sensor unit 103 in a state of being inclined by, for example, ± 0.2 ° to 0.3 ° from 90 °.

  The housing 101 accommodates the sensor unit 103 and the communication / control unit 104. It is preferable that the housing 101 be configured to be large enough to accommodate a monitor of the largest size on the production line. The housing 101 can be, for example, about 80 cm × 55 cm × 30 cm in size.

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

  FIG. 4 is a view showing a monitor mounting frame having mounting ports of different sizes depending on monitor panel sizes. Since the size of the monitor 150 is predetermined, for example, 17 inches, 24 inches, 31 inches in diagonal dimensions, the monitor 150 can be attached without gaps for each size of the monitor 150 as shown in FIG. By providing the monitor mounting frame 102, it is possible to use one having a size compatible with the size of the monitor 150.

The light receiving sensors 1031, _{1 to} 103 _{n, m} are assigned different measurement areas in the panel of the monitor 150, and all light receiving sensors 103 _{1, 1 to} 103 _{n, m} define the entire surface of the panel as the measurement range. 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 1031, _{1 to} 103 _{n, m} of the sensor unit 103, respectively. An 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 can be configured, for example, by arranging a plurality of light receiving sensors 1031, _{1 to} 103 _{n, m} in a grid. The sensor unit 103 can be configured of, for example, 32 light receiving sensors in the horizontal direction and 18 light receiving sensors 1031, _{1 to} 103 _{n, m} in the vertical direction.

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

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

FIG. 6 illustrates the unevenness detection method in the unevenness detection device according to the embodiment of the present invention. Each step shown in FIG. 6 is performed by the communication / control unit 104, and the sensor unit 103 includes n light receiving sensors 103 _{1, 1 to} 103 _{n, m} in the horizontal direction and m in the vertical direction. It shall be.

  In step S601, a test video display signal for displaying a test video for measurement on the panel is transmitted to the monitor 150. In this test video, for example, when measuring luminance, all white pixels at the same signal level of all pixels are output to the entire panel, 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 video is displayed on the panel of the monitor 150, the measurement by the sensor unit 103 is started.

In step S602, measurement values are acquired from the light receiving sensors 1031, _{1 to} 103 _{n, m} of the sensor unit 103, and are stored in the memory. As a measurement parameter, for example, illuminance, color, luminance and the like can be used.

In step S603, it is determined whether or not the difference between the measured value of each of the light receiving sensors 1031, _{1 to} 103 _{n, m} and a predetermined reference value exceeds a predetermined threshold value. The predetermined reference value used in step S603 may be an average value of all measurement data of the light receiving sensors 1031, _{1 to} 103 _{n, m} , but is not limited to this and can be set as appropriate. If it is determined in step S603 that the difference between each measurement value and the reference value exceeds the predetermined threshold value, the process proceeds to step S604.

  It is a correction value for the measurement area of the panel in the light receiving sensor that has output the measured value whose difference from the reference value exceeds the predetermined threshold value in step S604, and the correction is such 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 with respect to the numerical value of the difference between the reference value and the measurement value is determined in advance as a unit correction value, and the difference between the reference value and the actual measurement 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 method of calculating the correction value is not limited to this, and various methods can be adopted according to the application and the like.

  In step S605, the 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 a pixel unit or a pixel in a certain range. Thereafter, the process returns to step S602, and measurement is performed again in step S602. The loop from step S602 to step S605 is repeated until no measured value exceeding the threshold appears in step S603.

  If it is determined in step S603 that the difference between each measurement value and the reference value does not all exceed the predetermined threshold value, it is determined that the image on the panel is not uneven, for example, the measurement result, the correction result, The determination result is output to the external PC and the process ends. An external PC or the like can display the result transmitted from the unevenness detection device by text or other means.

Here, before the measurement by the sensor unit 103 is started, the light receiving sensor to be used is selected among 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. Steps may be executed, and steps S602 to S605 may be performed using the selected light receiving sensor. Thus, by selecting the light receiving sensor to be used in the sensor unit 103, it becomes possible to measure even monitors having different sizes.

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

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

  According to the unevenness detection apparatus and the unevenness correction system using the apparatus according to the embodiment of the present invention, since the fixation of the position of the monitor is completed only by attaching the monitor to the monitor attachment frame, the time for adjusting the position of the monitor is reduced. Accuracy can be improved because manual error can be eliminated. In addition, since the inside of the unevenness detection device is completely shielded from light, the inside of the device can be completely darkened, and measurement can be performed in the completely darkened state, so a separate darkroom is prepared for measurement. It is not necessary to do this, and inspection can be performed on the spot, and it is possible to reduce the time and cost required to perform monitor nonuniformity detection and nonuniformity correction.

Claims (5)

An unevenness detection device for detecting unevenness in an image displayed on a panel of a monitor, comprising:
A housing having an opening;
A monitor attachment frame having an attachment port configured to attach the monitor without a gap, and configured to attach to the opening of the housing without a gap;
A sensor unit including a plurality of light receiving sensors provided in the housing to face the panel of the monitor when the monitor attachment frame is attached to the opening and the monitor is attached to the monitor attachment;
Communication and control unit,
The nonuniformity detection device, wherein the communication / control unit determines whether a difference between a measured value of each light receiving sensor of the sensor unit and a predetermined reference value exceeds a predetermined threshold.   When the monitor attachment frame is attached to the opening and the monitor is attached to the monitor attachment frame, the light from the panel of the monitor is approximately vertically incident on each light receiving sensor of the sensor unit. The unevenness detection device according to claim 1, wherein the unevenness detection device is arranged to   The unevenness detection device according to claim 1 or 2, wherein the plurality of light receiving sensors are arranged in a lattice.   The said light receiving sensor is a brightness | luminance sensor or a color detection sensor, The nonuniformity detection apparatus in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. 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, the communication / control unit measures the panel in the light receiving sensor that has output the measured value exceeding the threshold. A nonuniformity correction system characterized in that a correction value signal including a correction value that makes a measurement value of each light receiving sensor of the sensor unit become the predetermined reference value is a correction value for a region. .

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