JP2018004801A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate reading of storage information stored in an information storage image being displayed, even under such a situation that it is difficult to read the storage information.SOLUTION: An image display device 10 comprises display means for displaying an information storage image 4 on a display surface 2 and contrast change means for changing contrast of an image displayed on the display surface by the display means. Contrast control means is provided for executing contrast control to increase contrast by the contrast change means when the display means displays the information storage image.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image display device.

  Conventionally, an image display device such as a projector capable of displaying an information storage image such as a matrix type two-dimensional code such as a QR code (registered trademark) on a display surface is known.

  Patent Document 1 discloses a projector that encodes data stored in a storage unit to generate a code image, and projects the generated code image onto a screen. The code image projected by the projector is captured and decoded by an electronic device with a camera such as a tablet terminal, and the data stored in the code image is read by the electronic device.

  Generally, a projector includes a contrast changing unit that changes the contrast of a display image. As a result, for example, when the user performs a low-contrast instruction operation or when a control such as the power saving mode is executed, the display image has a low contrast. When an information storage image is displayed at such a low contrast, there is a problem that it is difficult to read stored information stored in the information storage image by an information reading unit such as an electronic device with a camera.

  This problem is not limited to the projector, but also occurs when displaying an information storage image in an image display device including a contrast changing unit such as a liquid crystal display.

  In order to solve the above-described problem, the present invention provides an image having display means for displaying an information storage image on a display surface, and contrast changing means for changing the contrast of an image displayed on the display surface by the display means. A display device, comprising: contrast control means for executing contrast control for increasing contrast by the contrast changing means when the information storage image is displayed by the display means.

  According to the present invention, even in a situation where it is difficult to read the stored information stored in the displayed information storage image, it is possible to easily read the stored information stored in the information storage image. Is done.

It is explanatory drawing for demonstrating the structure of the image display system using the projector of embodiment. It is a block diagram which shows the structure of the projector. (A) is an initial screen displayed by the projector when the smartphone is connected to the projector so as to be communicable, and (b) displays a two-dimensional code image in which setting information necessary for communication connection is stored. It is a code display screen. It is a flowchart which shows the flow of the communication connection process in embodiment. 10 is a flowchart showing a flow of communication connection processing in Modification 1. 10 is a flowchart showing a flow of communication connection processing in Modification 2.

Hereinafter, an embodiment in which the present invention is applied to a projector which is an image projection apparatus as an image display apparatus will be described.
FIG. 1 is an explanatory diagram for explaining a configuration of an image display system using the projector according to the present embodiment.
The image display system according to the present embodiment includes a smartphone 1 that is an electronic device with a camera as an information reading unit and a projector 10. The smartphone 1 and the projector 10 are communicably connected, and an image is projected by the projector 10. To do. In the present embodiment, the connection between the smartphone 1 and the projector 10 is wirelessly connected, but may be wired.

  In the present embodiment, when the smartphone 1 is connected to the projector 10 so as to be communicable, first, the smartphone 1 acquires setting information necessary for communication connection from the projector 10. Specifically, a two-dimensional code image such as a QR code (registered trademark) is projected from the projector 10 onto the screen 2 as a display surface as an information storage image in which the setting information is stored. Then, the user uses the predetermined application software installed in the smartphone 1 and images the two-dimensional code image 4 displayed on the screen by a camera as an imaging unit provided in the smartphone 1. The captured image data of the two-dimensional code image 4 is decoded by the application software, and setting information stored in the two-dimensional code image 4 is acquired by the smartphone 1.

  The smartphone 1 that has acquired the setting information in this way executes connection processing for connecting to the projector 10 so as to be communicable according to the setting information by the application software. Thereby, communication is established between the smartphone 1 and the projector 10, and the image data in the smartphone 1 can be transmitted to the projector 10. As a result, the same image as that displayed on the screen of the smartphone 1 can be displayed on the screen 2 from the projector 10.

FIG. 2 is a block diagram showing a configuration of the projector in the present embodiment.
The projector 10 according to this embodiment includes an external I / F unit 100, a system control unit 101, an audio processing unit 102, a speaker 103, a video processing unit 104, an optical unit control unit 105, an optical unit 106, a light source control unit 107, and a light source 108. , A power supply control unit 109, a power supply 110, an operation unit 111, a remote control reception unit 112, a storage unit 113, a fan control unit 114, a fan 115, a temperature measurement unit 116, and the like.

  The external I / F unit 100 is an interface for inputting / outputting various information to / from external electronic devices including the smartphone 1. By connecting to an external electronic device (video output device) or the like via the external I / F unit 100, various information including image data and audio data is input / output (transmitted / received). The external I / F unit 100 includes a video port 1001 for transmitting and receiving image data and image data control information, an audio port 1002 for transmitting and receiving audio data and audio data control information, and a USB ( Universal Serial Bus (USB) terminal 1003 for transmitting / receiving various information to / from an electronic device connected to a terminal, LAN port 1004 for transmitting / receiving various information to / from an electronic device wired to a LAN (Local Area Network), LAN And a wireless LAN port 1005 for transmitting and receiving various types of information to and from an electronic device wirelessly connected to the electronic device. The smartphone 1 according to the present embodiment performs communication of various data via the wireless LAN port 1005 of the external I / F unit 100.

  The system control unit 101 controls other units constituting the projector 10. The system control unit 101 is realized by a CPU (Central Processing Unit) 1011, a ROM (Read Only Memory) 1012, a RAM (Random Access Memory) 1013, and an image processing unit 1014. The CPU 1011 is an arithmetic unit that implements various controls and functions including contrast control described later in accordance with various programs stored in the ROM 1012 and the system control unit 101. The ROM 1012 is a nonvolatile semiconductor memory (storage device) that stores various programs that can be executed by the projector 10, various data that is used when these various programs are executed, and arithmetic processing results of the CPU 1011. The RAM 1013 is a volatile semiconductor memory (storage device) having a program storage area for developing various programs executed by the CPU 1011, a data storage area for storing various input / output data, execution results of various programs, and the like. It is. The image processing unit 1014 performs image processing such as keystone correction and color correction on the image data input from the video processing unit 104.

  The audio processing unit 102 performs processing such as volume adjustment and sound quality adjustment of audio data input (received) via the external I / F unit 100. The sound processing unit 102 performs processing such as volume adjustment and sound quality adjustment on the input sound data, and then outputs the processed sound data to the speaker 103 and the sound output port. The speaker 103 is an audio output device that outputs audio in accordance with the audio data input from the audio processing unit 102. The speaker 103 may be a built-in speaker built in the projector 10 or may be a speaker of an external device connected to a cable or a network via an audio output port, for example.

  The video processing unit 104 performs various processes on the image data input (received) via the external I / F unit 100 so that the system control unit 101 can appropriately handle it. The video processing unit 104 performs various processes on the input image data, and then outputs the processed image data to the RAM 1013, a buffer memory, or the like.

  The optical unit control unit 105 controls the optical unit 106 to execute control for projecting an image based on the image data output from the video processing unit 104 to the RAM 1013 or the buffer memory onto the screen 2. The optical unit 106 is a unit (part) composed of optical parts such as a lens and a mirror.

  The light source control unit 107 controls turning on and off of the light source 108 and controlling the light amount of the light source 108 based on an instruction from the system control unit 101. For example, a mercury lamp can be used as the light source 108, but is not limited thereto.

  The power supply control unit 109 controls the power supply 110. The power source 110 supplies power to the projector 10.

The operation unit 111 receives various operation inputs from the user and sends the received operation input contents to the system control unit 101. The operation unit 111 accepts input from, for example, cursor keys, character / number keys, various function keys, and the like.
The remote control receiving unit 112 receives various operation inputs from a remote operation device (remote control), and sends the received operation input contents to the system control unit 101. The remote control receiving unit 112 receives input of cursor keys, character / number keys, and various functions from an infrared remote control, for example.

  The storage unit 113 is a nonvolatile semiconductor memory (storage device) such as an EEPROM (Electrically Erasable Programmable ROM). The storage unit 113 stores various programs that can be executed by the projector 10 and various data that are used when these various programs are executed. The various data are, for example, setting values used for various settings of the projector 10. The storage unit 113 may be a storage device such as an HD (Hard Disk). The storage unit 113 may be an external storage device connected to the projector 10 via a network, for example.

  The fan control unit 114 controls the fan 115. The fan 115 is for cooling or exhausting the projector body or the components of the projector.

The temperature measurement unit 116 is a temperature sensor that measures the temperature inside the projector.
The illuminance measurement unit 117 is an illuminance sensor that measures the brightness around the projector 10.

FIG. 3A is an initial screen A displayed by the projector 10 when the smartphone 1 is connected to the projector 10 so as to be communicable. FIG. 3B stores setting information necessary for communication connection. 3 is a code display screen B for displaying a two-dimensional code image.
FIG. 4 is a flowchart showing the flow of communication connection processing in this embodiment.

  When the user performs an operation input for starting communication connection processing on the operation unit 111 of the projector 10, an initial screen A as shown in FIG. 3A is displayed on the screen 2 by the projector 10. On this initial screen A, an image portion 6 for explaining the operation content of “display [Enter] code image” is displayed. When the user presses the [Enter] key of the projector 10 while the initial screen A is displayed (S1), the operation input is accepted by the operation unit 111 and sent to the system control unit 101. Accordingly, the system control unit 101 performs contrast control for increasing the contrast of the image projected from the optical unit 106 onto the screen 2 by the image processing unit 1014 (S2). The method for increasing the contrast of the image projected on the screen 2 is not particularly limited, and widely known methods can be used.

  In contrast control of this embodiment, the contrast setting for the two-dimensional code image is changed so as to obtain the maximum contrast at which the contrast of the projected image can be set. Is not necessary to obtain the maximum contrast. In particular, when the maximum contrast is obtained for the two-dimensional code image 4, it becomes difficult to see the image portion 3 indicating the explanatory text other than the two-dimensional code image 4 included in the code display screen B and the image portion 5 indicating the operation content. There is. In such a case, it is preferable to set the contrast so that the recognition rate of the two-dimensional code image can be within the allowable range and the visibility of the other image portions 3 and 5 can be maintained within the allowable range. .

  Thereafter, the system control unit 101 reads the image data of the two-dimensional code image stored in the storage unit 113 and the like, and based on this, the code display screen including the two-dimensional code image 4 as shown in FIG. Control for projecting B onto the screen 2 is executed (S3). As a result, a high-contrast two-dimensional code image 4 is displayed on the screen 2.

  On the code display screen B displayed on the screen 2, an image portion 3 displaying an explanatory note “Please read the code image with the smartphone photographing application” and an image explaining the operation content “[Enter] Return” Part 5 is displayed. When the code display screen B is displayed, the user activates the corresponding application software installed on the smartphone 1 and captures the two-dimensional code image 4 displayed on the screen 2 with the camera of the smartphone 1. . Thereby, as described above, the setting information stored in the captured two-dimensional code image 4 is acquired by the smartphone 1, and communication is established between the smartphone 1 and the projector 10.

  Thereafter, when the user presses the [Enter] key of the projector 10 (S4), the operation input is received by the operation unit 111 and sent to the system control unit 101. Accordingly, the system control unit 101 controls the optical unit control unit 105 and the light source control unit 107 to change the image contrast setting from the contrast setting for the two-dimensional code image to the contrast setting before the setting change. Return (S5). Then, the initial screen A shown in FIG. 3A is again displayed on the screen 2 (S6).

  Since communication between the smartphone 1 and the projector 10 has been established, the user can transmit image data in the smartphone 1 to the projector 10. Therefore, the user can operate the smartphone 1 to display the same image as the image displayed on the screen of the smartphone 1 on the screen 2 from the projector 10.

  In order to capture and decode the two-dimensional code image 4 with the camera of the smartphone 1, that is, to read the setting information stored in the two-dimensional code image 4, an image pattern indicating the setting information in the two-dimensional code image 4 Need to recognize. At this time, the lower the contrast of the captured image captured by the camera of the smartphone 1, the lower the recognition rate of the image pattern (the degree of successful image pattern recognition), and the setting information stored in the two-dimensional code image 4. Becomes difficult to read.

  According to the present embodiment, when the code display screen B including the two-dimensional code image 4 is projected, the setting is changed to the contrast setting that maximizes the contrast of the two-dimensional code image 4 displayed on the screen 2. As a result, a high-contrast two-dimensional code image 4 is displayed on the screen 2. Therefore, the contrast of the captured image obtained by capturing the two-dimensional code image 4 with the camera of the smartphone 1 is high, and the recognition rate of the image pattern is increased. Accordingly, it becomes easy to read the setting information stored in the two-dimensional code image 4, so that the user does not have to repeat the photographing of the two-dimensional code image 4 and the setting information is read. Convenience increases as time is shortened.

[Modification 1]
Next, a modified example of the communication connection process in the present embodiment (hereinafter referred to as “modified example 1”) will be described.
FIG. 5 is a flowchart showing the flow of communication connection processing in the first modification.
When the projector 10 is operating in the energy saving mode that is the low contrast operation mode, the brightness (brightness) of the code display screen B projected on the screen 2 is entirely dark and is included in the code display screen B. The contrast of the two-dimensional code image 4 is low. Here, the energy saving mode is an operation mode in which, for example, the light source 108 using a lamp having a rated output of 250 W is operated at 250 W in the normal operation mode, and this is operated at 190 W.

  In the first modification, when the code display screen B is displayed, if the current mode is the energy saving mode (Yes in S10), the contrast of the two-dimensional code image 4 is increased in order to increase the recognition rate of the two-dimensional code image 4. The contrast setting for the two-dimensional code image to be increased is changed (S2), and the code display screen B is projected (S3). However, if it is not the energy saving mode but the normal mode (No in S10), the displayed two-dimensional code image 4 has a contrast with which a sufficiently high recognition rate can be obtained, and the code display screen is not changed without changing the contrast setting. B is projected (S3).

  According to the first modification, the contrast of the two-dimensional code image 4 is increased only when the projection image is dark and the two-dimensional code image 4 is in an operation mode (energy saving mode) in which the recognition rate is particularly low. The recognition rate of 4 can be increased.

[Modification 2]
Next, another modified example of the communication connection process in the present embodiment (hereinafter, this modified example is referred to as “modified example 2”) will be described.
FIG. 6 is a flowchart showing the flow of communication connection processing in the second modification.
When the brightness (illuminance) of the room that illuminates the screen 2 on which the image is projected from the projector 10 is bright, the contrast of the two-dimensional code image 4 included in the code display screen B projected on the screen 2 is low.

  In the second modification, when the code display screen B is displayed, the brightness around the projector 10 is measured by the illuminance measurement unit 117, and when the measured value exceeds the threshold value, the room 2 that illuminates the screen 2 is measured. It is determined that the brightness (illuminance) is bright (Yes in S20), and the contrast setting for the two-dimensional code image is increased to increase the contrast of the two-dimensional code image 4 in order to increase the recognition rate of the two-dimensional code image 4 ( S2) The code display screen B is projected (S3). On the other hand, when the measurement value of the illuminance measurement unit 117 is equal to or less than the threshold value, it is determined that the brightness (illuminance) of the room illuminating the screen 2 is dark (No in S20). In this case, the displayed two-dimensional code image 4 has a contrast with which a sufficiently high recognition rate can be obtained, and the code display screen B is projected without changing the contrast setting (S3).

  According to the second modification, the contrast of the two-dimensional code image 4 is increased only when the brightness (illuminance) of the room that illuminates the screen 2 is bright and the recognition rate of the two-dimensional code image 4 is particularly low. The recognition rate of the two-dimensional code image 4 can be increased.

In the present embodiment, the two-dimensional code image 4 in which setting information for connecting the smartphone 1 and the projector 10 so as to be communicable is described as an example. However, information stored in the two-dimensional code image is described. There is no particular limitation, and a two-dimensional code image in which any information is stored may be used.
In this embodiment, an example in which the information storage image is a matrix type two-dimensional code image has been described. However, any other two-dimensional code image may be used as long as the image has an image pattern corresponding to the storage information. Alternatively, it may be a barcode image.
In this embodiment, the case where the display unit is an image projection unit has been described. However, the same applies to a display unit other than the image projection unit, such as a liquid crystal display device.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
Display means such as an optical unit 106 that displays an information storage image such as a two-dimensional code image 4 on a display surface such as the screen 2, and an optical unit controller that changes the contrast of the image displayed on the display surface by the display means. An image display device such as a projector 10 having a contrast change unit such as 105, and the like, and when the information storage image is displayed by the display unit, a system control unit 101 that executes contrast control for increasing contrast by the contrast change unit It is characterized by having a contrast control means.
According to this aspect, for example, storage information stored in an information storage image having an image pattern such as an image density pattern corresponding to storage information such as setting information and read by a predetermined information reading unit such as the smartphone 1 can be read. Even under difficult circumstances, an information storage image with increased contrast can be displayed by the contrast changing means, and the stored information can be easily read.

(Aspect B)
In the aspect A, the information storage image is a two-dimensional code image.
According to this, stored information having a larger amount of information than a barcode image or the like can be handled.

(Aspect C)
In the aspect A or B, the contrast control unit determines whether or not a contrast condition for reading stored information stored in the information storage image by the predetermined information reading unit is satisfied, and the contrast condition If the contrast condition is not satisfied, the contrast control is executed, and if the contrast condition is satisfied, the contrast control is not executed.
According to this, when the contrast condition for reading the stored information stored in the information storage image is satisfied, further increase in contrast is suppressed. This suppresses adverse effects caused by increasing the contrast (such as adverse effects that make it difficult to view other images displayed together with the information storage image).

(Aspect D)
The aspect C includes a low-contrast operation mode such as an energy saving mode for reducing the contrast of an image and a high-contrast operation mode such as a normal mode for increasing the contrast higher than the low-contrast operation mode. It is determined that the contrast condition is not satisfied when operating in the low contrast operation mode.
According to this, it is suppressed that the contrast is further increased in the high contrast operation mode in which an information storage image having a sufficiently high contrast is obtained. This suppresses adverse effects caused by increasing the contrast (such as adverse effects that make it difficult to view other images displayed together with the information storage image).

(Aspect E)
In the aspect C or D, there is a detection unit such as an illuminance measurement unit 117 that detects the brightness that illuminates the display surface, and the contrast control unit has a brightness detected by the detection unit exceeding a specified value. Sometimes it is determined that the contrast condition is not satisfied.
According to this, in an environment where the brightness of the display surface is dark and an information storage image with sufficiently high contrast can be obtained, the contrast is further prevented from being increased. This suppresses adverse effects caused by increasing the contrast (such as adverse effects that make it difficult to view other images displayed together with the information storage image).

(Aspect F)
In any one of the aspects A to E, the display unit is an image projection unit that projects and displays an image on the display surface.
According to this, for example, even when it is difficult to read the stored information stored in the projected information storage image with a predetermined information reading means, the stored information can be easily read.

DESCRIPTION OF SYMBOLS 1 Smart phone 2 Screen 4 Two-dimensional code image 10 Projector 100 External I / F part 101 System control part 105 Optical unit control part 106 Optical unit 107 Light source control part 108 Light source 111 Operation part 113 Storage part 117 Illuminance measurement part A Initial screen B Code Display screen

JP2015-169952A

Claims (6)

Display means for displaying the information storage image on the display surface;
An image display device comprising: a contrast changing unit that changes a contrast of an image displayed on the display surface by the display unit;
An image display apparatus comprising: contrast control means for executing contrast control for increasing contrast by the contrast changing means when the information storage image is displayed by the display means. The image display device according to claim 1,
The image display device, wherein the information storage image is a two-dimensional code image. The image display device according to claim 1 or 2,
The contrast control means determines whether or not a contrast condition for reading stored information stored in the information storage image by the predetermined information reading means is satisfied, and when the contrast condition is not satisfied An image display device, wherein the contrast control is executed, and the contrast control is not executed when the contrast condition is satisfied. The image display device according to claim 3,
A low-contrast operation mode that lowers the contrast of the image and a high-contrast operation mode that increases the contrast higher than the low-contrast operation mode;
The image display apparatus according to claim 1, wherein the contrast control unit determines that the contrast condition is not satisfied when operating in the low contrast operation mode. The image display device according to claim 3 or 4,
Detecting means for detecting brightness illuminating the display surface;
The image display apparatus according to claim 1, wherein the contrast control unit determines that the contrast condition is not satisfied when the brightness detected by the detection unit exceeds a specified value. The image display device according to any one of claims 1 to 5,
The image display device, wherein the display means is image projection means for projecting and displaying an image on the display surface.

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