Image recording method, image recording program, data processing apparatus, and image recording apparatus

A non-transitory computer readable storage medium storing an image recording program causing a computer to execute:

• a procedure for acquiring, from a plurality of cameras which are not synchronized in time, respective video images which the plurality of cameras start capturing in the sea before a first light that is lit in a first color is turned on and end capturing after a second light that is lit in a second color is turned on after the first light is turned on;
• a procedure for detecting, for each of the video images acquired from the plurality of cameras, a difference in luminance between chronologically adjacent frames in the video image acquired from one of the plurality of cameras;
• a procedure for associating times of frames between the video images on the basis of the difference;
• and
• a procedure for recording the video images with the associated times in a recording medium.

An image processing apparatus comprising:

• an acquirer configured to acquire, from a plurality of cameras which are not synchronized in time, respective video images which the plurality of cameras start capturing in the sea before a first light that is lit in a first color is turned on and end capturing after a second light that is lit in a second color is turned on after the first light is turned on;
• a detector configured to detect, for each of the video images acquired from the plurality of cameras, a difference in luminance between chronologically adjacent frames in the video image acquired from one of the plurality of cameras;
• a linker configured to associate times of frames between the video images on the basis of the difference;
• and
• a controller configured to record the video images with the associated times in a recording medium.

An image recording apparatus comprising:

• a plurality of cameras configured to image a subject in the sea, wherein the plurality of cameras are not synchronized in time;
• a plurality of first lights that are lit in a first color and arranged at intervals of a predetermined reference space;
• a storage configured to store an image generated by the plurality of cameras;
• a controller configured to turn on the first light after the plurality of cameras start imaging;
• and
• a second light that is lit in a second color,
• wherein the controller is configured to turn on the second light after a predetermined time elapses from turning on at least one of the first lights, and the plurality of cameras configured to direct image the plurality of first lights and the subject.