Providing a zoom lens system capable of obtaining higher optical performance, an imaging apparatus, and a method for varying a focal length of the zoom lens system. The input data allows the indoor wear test machine to accurately simulate an outdoor wear test course for the characterized vehicle. The method includes simultaneously measuring the current response to this pulsed load. A decoding device may receive data defining a ROI as well as the temporal spatial dependency value and decode a video block in the ROI based at least in part on the temporal spatial dependency value.