| 摘要 |
A method is provided for operating a position data determining device 125 connected to a camera 105, the device being adapted to determine position data relating to the position of the device and to send that data to the camera for associating with images taken by the camera. The device is, for example, a Global Positioning System (GPS). The method comprises using a control signal 130 received from the camera to determine when position data is sent to the camera, the control signal (130) providing an indication of the state of a control button 110 on the camera. The control signal may be a shutter release signal relating to the state of a shutter release button. It may be determined from the control signal whether the shutter release button has moved between a released state and a half-pressed state, position data being sent to the camera dependent upon that determination. The camera may be of a type to maintain itself in a high power mode, relative to an idle mode, when positioning data is being sent from the device, so that the disclosed method allows the device to operate in a first mode in which positioning data is not sent to the camera, thereby allowing the camera to move out of its high power mode, and in a second mode in which positioning data is sent to the camera. Selection between the first and second modes may be determined in dependence upon the control signal. |
