Device for correcting still image errors in a video signal
View Patent ↗In a device for correcting picture instabilities in film scanners, at least one motion vector describing the motion of at least one part of the picture between two scanned pictures is derived and an actuator situated in the path of the video signals obtained by scanning is controlled in a manner dependent on said motion vector, in each case the at least one motion vector of successive pictures being fed to a filter, the filter containing a plurality of registers, to which the at least one motion vector can be fed and which are assigned a state variable which is set if the respective register content is valid, the contents of the registers with a set state variable being accumulated by a new motion vector when the latter arrives, the state variable being reset if the state variable was set before the arrival of the new motion vector and the content of the respective register exceeds a predetermined threshold, the content of one of the registers with a reset state variable being set to zero and the state variable being set to one and an average value being formed from the contents of the registers with a set state variable, said average value being fed to the actuator with an opposite sign.
1. An apparatus for correcting picture instabilities in a video signal, having a device for deriving a correction signal in a manner dependent on deviations in successive pictures of the video signal to be corrected, having an actuator, which has an input for receiving the video signal to be corrected, a control input for feeding in the derived correction signal and an output for outputting the corrected video signal, having a filter, which receives, at art input a motion vector signal describing the vector of a motion between successive pictures, which derives a correction signal from the received motion vector signal and outputs it at an output, wherein
in that in each case at least one motion vector of the successive pictures is fed to the filter,
in that the filter contains a plurality of registers to which at least one motion, vector can be fed and which are assigned a state variable if the respective register content is valid,
in that the contents of the registers with a set state variable are accumulated by a new motion vector when the latter arrives,
in that the state variable is reset it the state variable was set before the arrival of the new motion vector and the content of the respective register exceeds a predetermined threshold,
in that the content of one of the registers with a reset state variable is set to zero and the state variable is set to one, and
in that an average value is formed from the contents of the registers with a set state variable, said average value being fed to the actuator with an opposite sign.
2. The apparatus as claimed in claim 1 , wherein a respective filter is provided for each of the components of the motion vectors.
3. A film scanner comprised of an apparatus for correcting picture instabilities in a video signal as claimed in claim 1 .
4. A portable video camera comprised of an apparatus for correcting picture instabilities in a video signal as claimed in claim 1 .