Image transfer system, image receiver, image transmitter, image transfer method, image reception method, image transmission method, and program

An image receiver for receiving communication data corresponding to captured image data output after imaging is newly performed every time an imaging synchronization signal is generated from an image transmitter by radio waves and displaying a display image corresponding to the captured image data,

• wherein the image receiver comprising a communicator, a monitor, a synchronization signal generation function, and one or more processors,
• wherein the synchronization signal generation function is configured to generate a display synchronization signal, and
• generate a display image corresponding to the captured image data from the communication data received by radio waves in the communicator, and cause the monitor to display a newly generated display image every time the display synchronization signal is generated,
• wherein, when one piece of communication data satisfying a predetermined criterion among pieces of communication data corresponding to the captured image data is defined as specific communication data, the one or more processors are configured to
• calculate a synchronization deviation time from a generation time-point of the display synchronization signal to a reception time-point of the specific communication data for the communicator with respect to each of the display synchronization signal generated in the synchronization signal generation function,
• extract two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated,
• calculate an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the display synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data, and
• cause a communication packet for adjusting the cycle of the display synchronization signal or adjusting the cycle of the imaging synchronization signal to be transmitted from the communicator to the image transmitter by radio waves on the basis of the adjustment value.

An image transmitter for transmitting communication data corresponding to a display image to an image receiver configured to display the display image newly generated every time a display synchronization signal is generated by radio waves,

• wherein the image transmitter comprising a communicator, an imager, a synchronization signal generation function, and one or more processors,
• wherein the synchronization signal generation function is configured to generate an imaging synchronization signal,
• wherein the one or more processors cause the imager to perform new imaging every time the imaging synchronization signal is generated and cause communication data corresponding to captured image data output from the imager to be transmitted from the communicator to the image receiver by radio waves, and
• wherein, when communication data to be transmitted is defined as specific communication data at a timing when the display synchronization signal is generated by the image receiver, the one or more processors are configured to
• calculate a synchronization deviation time from a generation time-point of the imaging synchronization signal to a reception time-point of the specific communication data for the communicator with respect to each of the imaging synchronization signal generated in the synchronization signal generation function,
• extract two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated,
• calculate an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the imaging synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data, and
• cause a communication packet for adjusting the cycle of the imaging synchronization signal or adjusting the cycle of the display synchronization signal to be transmitted from the communicator to the image receiver by radio waves on the basis of the adjustment value.

An image transfer method for use in an image transfer system having an image transmitter and an image receiver, the image transfer method comprising:

• generating, by a synchronization signal generation function of the image transmitter, an imaging synchronization signal;
• causing, by one or more processors of the image transmitter, an imager of the image transmitter to perform new imaging every time the imaging synchronization signal is generated and causing communication data corresponding to captured image data output from the imager to be transmitted from a communicator of the image transmitter to the image receiver by radio waves;
• generating, by a synchronization signal generation function of the image receiver, a display synchronization signal;
• generating, by one or more processors of the image receiver, a display image corresponding to the captured image data from the communication data received by radio waves in a communicator of the image receiver and causing a monitor of the image receiver to display a newly generated display image every time the display synchronization signal is generated;
• causing, by the processor of one of the image transmitter and the image receiver, specific communication data predetermined between the image transmitter and the image receiver to be transmitted from one of the communicator to the other communicator by radio waves after the display synchronization signal is generated every time the imaging synchronization signal or the display synchronization signal is generated in the synchronization signal generation function of the one communicator;
• calculating, by the processor of one of the image transmitter and the image receiver, a synchronization deviation time from a generation time-point of the imaging synchronization signal or the display synchronization signal to a reception time-point of the specific communication data for the communicator of the image transmitter or the image receiver with respect to each of the imaging synchronization signal or the display synchronization signal generated in the synchronization signal generation function of the image transmitter or the image receiver;
• extracting, by the processor of one of the image transmitter and the image receiver, two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated;
• calculating, by the processor of one of the image transmitter and the image receiver, an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal generated in the synchronization signal generation function of the one communicator or the other communicator on the basis of a generation time interval of the imaging synchronization signal or the display synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data;
• and
• causing, by the processor of one of the image transmitter and the image receiver, a communication packet for adjusting a cycle of the imaging synchronization signal or the display synchronization signal of the one communicator or adjusting a cycle of the imaging synchronization signal or the display synchronization signal of the other communicator on the basis of the adjustment value to be transmitted from the communicator of the one communicator to the other communicator by radio waves.

An image reception method for use in an image receiver for receiving communication data corresponding to captured image data output after imaging is newly performed every time an imaging synchronization signal is generated from an image transmitter by radio waves and displaying a display image corresponding to the captured image data, the image reception method comprising:

• generating, by a synchronization signal generation function, a display synchronization signal;
• generating, by the synchronization signal generation function, a display image corresponding to the captured image data from the communication data received by radio waves in a communicator, and causing a monitor to display a newly generated display image every time the display synchronization signal is generated;
• calculating, by the one or more processors, a synchronization deviation time from a generation time-point of the display synchronization signal to a reception time-point of the specific communication data for the communicator with respect to each of the display synchronization signal generated in the synchronization signal generation function, when one piece of communication data satisfying a predetermined criterion among pieces of communication data corresponding to the captured image data is defined as specific communication data;
• extracting, by the one or more processors, two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated;
• calculating, by the one or more processors, an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the display synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data;
• and
• causing, by the one or more processors, a communication packet for adjusting the cycle of the display synchronization signal or adjusting the cycle of the imaging synchronization signal to be transmitted from the communicator to the image transmitter by radio waves on the basis of the adjustment value.

A non-transitory computer readable medium having stored thereon a program for causing a computer to execute an image reception method for use in an image receiver for receiving communication data corresponding to captured image data output after imaging is newly performed every time an imaging synchronization signal is generated from an image transmitter by radio waves and displaying a display image corresponding to the captured image data, the program comprising:

• generating, by a synchronization signal generation function, a display synchronization signal;
• generating, by the synchronization signal generation function, a display image corresponding to the captured image data from the communication data received by radio waves in a communicator, and causing a monitor to display a newly generated display image every time the display synchronization signal is generated;
• calculating, by the one or more processors, a synchronization deviation time from a generation time-point of the display synchronization signal to a reception time-point of the specific communication data for the communicator with respect to each of the display synchronization signal generated in the synchronization signal generation function, when one piece of communication data satisfying a predetermined criterion among pieces of communication data corresponding to the captured image data is defined as specific communication data;
• extracting, by the one or more processors, two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated;
• calculating, by the one or more processors, an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the display synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data;
• and
• causing, by the one or more processors, a communication packet for adjusting the cycle of the display synchronization signal or adjusting the cycle of the imaging synchronization signal to be transmitted from the communicator to the image transmitter by radio waves on the basis of the adjustment value.

An image transmission method for use in an image transmitter for transmitting communication data corresponding to a display image to an image receiver configured to display the display image newly generated every time a display synchronization signal is generated by radio waves, the image transmission method comprising:

• generating, by a synchronization signal generation function, an imaging synchronization signal;
• causing, by one or more processors, an imager to perform new imaging every time the imaging synchronization signal is generated and causing communication data corresponding to captured image data output from the imager to be transmitted from a communicator to the image receiver by radio waves;
• calculating, by the one or more processors, a synchronization deviation time from a generation time-point of the imaging synchronization signal to a reception time-point of the specific communication data for the communicator of the image receiver with respect to each of the imaging synchronization signal generated in the synchronization signal generation function, when communication data to be transmitted is defined as specific communication data at a timing when the display synchronization signal is generated by the image receiver;
• extracting, by the one or more processors, two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated;
• calculating, by the one or more processors, an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the imaging synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data, and
• causing, by the one or more processors, a communication packet for adjusting a cycle of the imaging synchronization signal or adjusting a cycle of the display synchronization signal to be transmitted from the communicator to the image receiver by radio waves on the basis of the adjustment value.

A non-transitory computer readable medium having stored thereon a program for causing a computer to execute an image transmission method for use in an image transmitter for transmitting communication data corresponding to a display image to an image receiver configured to display the display image newly generated every time a display synchronization signal is generated by radio waves, the program comprising:

• generating, by a synchronization signal generation function, an imaging synchronization signal;
• causing, by one or more processors, an imager to perform new imaging every time the imaging synchronization signal is generated and causing communication data corresponding to captured image data output from the imager to be transmitted from a communicator to the image receiver by radio waves;
• calculating, by the one or more processors, a synchronization deviation time from a generation time-point of the imaging synchronization signal to a reception time-point of the specific communication data for the communicator of the image receiver with respect to each of the imaging synchronization signal generated in the synchronization signal generation function, when communication data to be transmitted is defined as specific communication data at a timing when the display synchronization signal is generated by the image receiver;
• extracting, by the one or more processors, two pieces of the specific communication data from the specific communication data other than the specific communication data with a maximum synchronization deviation time, among a plurality of pieces of the specific communication data for which the synchronization deviation time is calculated;
• calculating, by the one or more processors, an adjustment value of a cycle of the imaging synchronization signal or the display synchronization signal on the basis of a generation time interval of the imaging synchronization signal of the two extracted pieces of the specific communication data and a difference between synchronization deviation times corresponding to the two extracted pieces of the specific communication data, and
• causing, by the one or more processors, a communication packet for adjusting a cycle of the imaging synchronization signal or adjusting a cycle of the display synchronization signal to be transmitted from the communicator to the image receiver by radio waves on the basis of the adjustment value.