Image display system, image display method, and display device

1. An image display system comprising:

a display device; and an information terminal,

the display device having at least a first processor that:

generates a first display image having size adjustment regions added thereto, based on a video signal outputted by the information terminal; and

outputs the first display image to the information terminal;

the information terminal having at least a second processor that:

outputs the video signal to the display device;

acquires screen adjustment information to generate a display screen to be displayed on the display device, based on the first display image; and

transmits the screen adjustment information to the display device, wherein

the at least first processor generates a second display image, based on the screen adjustment information;

a database in which identification information used for identifying a combination of the display device and the information terminal, and the screen adjustment information are registered in correspondence with each other;

a screen adjustment information generator that detects the size adjustment regions in the first display image, and generates screen adjustment information that makes the detected size adjustment regions narrower; and

a screen adjustment information register that registers the screen adjustment information generated by the screen adjustment information generator in the database, in correspondence with the identification information, wherein:

if the screen adjustment information about the combination of the information terminal and the display device is stored in the database, the at least second processor of the information terminal acquires the screen adjustment information from the database; and

if the screen adjustment information about the combination of the information terminal and the display device is not stored in the database, the screen adjustment information is generated by the screen adjustment information generator and the screen adjustment information is registered in the database by the screen adjustment information register.

2. The image display system according to claim 1 , wherein:

the at least first processor generates the first display image before receiving the screen adjustment information from the information terminal, and generates the second display image as the display screen after receiving the screen adjustment information from the information terminal, wherein the size adjustment regions of the second display image are made narrower than those of the first display image in accordance with the screen adjustment information.

3. The image display system according to claim 1 , wherein:

the at least second processor outputs a calibration image as the video signal before the screen adjustment information is acquired, wherein at least one of a brightness and a hue of the calibration image is different from that of the size adjustment regions by a predetermined value or more.

4. The image display system according to claim 1 , wherein:

the screen adjustment information includes information about widths of the size adjustment regions or information about a scaling factor of expansion of a video region of the video signal.

5. The image display system according to claim 1 , further comprising:

a server comprising the database, the screen adjustment information generator, and the screen adjustment information register.

6. The image display system according to claim 1 , wherein:

the at least second processor further:

executes an application; and

determines whether the application currently executed is switched to another application, wherein

if it is determined that the application currently executed is switched to another application, the at least second processor acquires the screen adjustment information corresponding to the application that is executed after the switching.

7. An image display method, wherein:

an information terminal outputs a video signal to a display device;

the display device, to which the video signal is inputted, generates a first display image including size adjustment regions based on the video signal and outputs the first display image to the information terminal;

the information terminal acquires screen adjustment information used by the display device to generate a display screen, based on the first display image, and transmits the screen adjustment information to the display device; and

the display device generates a second display image based on the screen adjustment information, and wherein:

if the screen adjustment information about a combination of the information terminal and the display device is stored in a database, the information terminal acquires the screen adjustment information from the database; and

if the screen adjustment information about the combination of the information terminal and the display device is not stored in the database, the information terminal detects the size adjustment regions in the first display image, generates the screen adjustment information that makes the detected size adjustment information narrower, and registers the generated screen adjustment information in the database in correspondence with the combination of the information terminal and the display device.

8. The image display method according to claim 7 , wherein:

the video signal used to generate the first display image is a signal about a video having at least one of a brightness and a hue different from that of the size adjustment regions by a predetermined value or more.

9. The image display method according to claim 7 , wherein:

the screen adjustment information includes information about widths of the size adjustment regions or information about a scaling factor of expansion of a video region included in the video signal.

10. The image display method according to claim 7 , wherein:

the information terminal can execute an application and determines whether the currently executed application is switched to another application;

if it is determined that the currently executed application is switched to another application, the information terminal acquires the screen adjustment information corresponding to the application that is executed after the switching.

11. A display device comprising:

at least one processor that generates a first display image, based on a video signal outputted from an information terminal; and

a screen adjustment information generator that generates screen adjustment information to generate a display screen, based on the first display image, wherein

the at least one processor generates a second display image, based on the screen adjustment information generated by the screen adjustment information generator, and

a screen adjustment information register that registers the screen adjustment information generated by the screen adjustment information generator in a database, wherein

if the screen adjustment information about a combination of an information terminal and the display device is not stored in the database, the screen adjustment information is generated by the screen adjustment information generator and the screen adjustment information is registered in the database by the screen adjustment information register,

in the database, identification information is used for identifying a combination of the display device and the information terminal, and the screen adjustment information are registered in correspondence with each other,

the screen adjustment information generator detects the size adjustment regions in the first display image, and generates screen adjustment information that makes the detected size adjustment regions narrower,

the screen adjustment information register registers the screen adjustment information generated by the screen adjustment information generator in the database in correspondence with the identification information, wherein:

if the screen adjustment information about the combination of the information terminal and the display device is stored in the database, the at least second processor of the information terminal acquires the screen adjustment information from the database; and

if the screen adjustment information about the combination of the information terminal and the display device is not stored in the database, the screen adjustment information is generated by the screen adjustment information generator and the screen adjustment information is registered in the database by the screen adjustment information register.