Abstract: The apparatus and methods allow for correcting data from a sensor due to changes in relative speed of that sensor. The methods and apparatus described use a determined entropy from data associated with across a direction of travel of the sensor together with a determined entropy from data associated with in a direction of travel of the sensor. The determined entropies allow for providing for correcting the data for changes in the relative speed of the sensor. Also, described are methods and apparatus for correcting data from at least first and second sensors of a measurement device, whereby features are correlated from datasets taken from both sensors to determine one or more corresponding signatures. These signatures can then be used to correct the data from first and second sensors.

Abstract: The apparatus and methods allow for correcting data from a sensor due to changes in relative speed of that sensor. The methods and apparatus described use a determined entropy from data associated with across a direction of travel of the sensor together with a determined entropy from data associated with in a direction of travel of the sensor. The determined entropies allow for providing for correcting the data for changes in the relative speed of the sensor. Also, described are methods and apparatus for correcting data from at least first and second sensors of a measurement device, whereby features are correlated from datasets taken from both sensors to determine one or more corresponding signatures. These signatures can then be used to correct the data from first and second sensors.

Abstract: The invention generally relates to the field of digital playback and especially to operation of “trickplay” features such as fast-forward and rewind, more particularly to the invention relates to playback of an auxiliary video stream during trickplay of a standard digital video stream. Embodiments of the invention are useful in digital video players and recorders. A system for playing stored video data, the system having a rapid play or rewind mode, the system comprising: means for detecting operation of said rapid play or rewind mode; and means for outputting supplementary program material during said operation of said rapid play or rewind mode. Preferably the system selects a video stream which is configured so that it plays at a substantially normal rate in a forward direction when output by a video player operating in a rapid play or rewind mode.