Image display system, image display method, image display program, and computer-readable recording medium storing said program

摘要

The image display system includes a calculation unit, a specifying unit, a generation unit and a transmitting unit. Upon change of a zoom level of a current image not containing position information to a specified value on a user terminal, the calculation unit calculates a display range of an object represented by the current image after change in zoom level. The specifying unit refers to data of a different image of the object and specifies a part of the different image indicated by the display range calculated by the calculation unit. The different image has a different resolution from the current image. The generation unit generates a next image representing the part specified by the specifying unit using the data of the different image. The transmitting unit transmits the next image to the user terminal for switching from the current image to the next image.

主权项

1. An image display system comprising:
at least one memory operable to store program code; at least one processor operable to access said memory and read said program code and operate as instructed by said program code, said program code including: calculation code configured to cause at least one of said at least one processor to, when a zoom level of a current image not containing position information of an object reaches a first threshold on a user terminal, divide the current image into meshes and then, calculate a display range of the object represented by the current image after change in zoom level by specifying blocks of the current image constituting the display range; specifying code configured to cause at least one of said at least one processor to refer to data of a different image of the object from a storage unit, the different image being divided into meshes and having a different resolution from the current image, and specify a part of the different image indicated by blocks of the different image corresponding to the blocks constituting the calculated display range; generation code configured to cause at least one of said at least one processor to generate a next image representing the specified part based on the blocks constituting the part of the different image; and transmitting code configured to cause at least one of said at least one processor to transmit the next image to the user terminal for switching from the current image to the next image, wherein when the zoom level of the current image reaches a second threshold different from the first threshold before reaching the first threshold, the calculation code is further configured to cause at least one of said at least one processor to, before the zoom level of the current image reaches the first threshold, start calculating the display range of a case where the zoom level of the current image reaches the first threshold, and when the zoom level of the current image reaches the first threshold without going through the second threshold, the calculation code is further configured to cause at least one of said at least one processor to calculate the display range of the object represented by the current image after change in zoom level in response to change of the zoom level to the first threshold.