Patent ID: 8060659

Claim:
A method of determining an optimal image transmission method when image data is transmitted from an image supplying device to an image display device, the method comprising: a capability request step of transmitting a capability request command from the image supplying device to the image display device; a capability request command response step of transmitting capability information from the image display device to the image supplying device according to the capability request command, the capability information including resolution of the image display device; and an image transmission method determining step of determining, before the image data is transmitted after a transmission path from the image supplying device to the image display device is established, an image transmission method on the basis of correspondence table, which is previously prepared, such that the optimal image transmission method according to at least one of transmission path information and capability of the image display device acquired by the image supplying device is derived, wherein the image transmission method determining step further includes a scaling determining step of determining, based on the resolution of the image display device, which of the image supplying device and the image display device executes scaling of the image data for decreasing the data amount of the image data by reducing the image.