Thomson Licensing

U.S. Philips Corporation

Thomas Leonard

Berthold Eiberger

Broder Wendland

Guido Kohlmeyer

Andreas Low

Kurt-Heiner Philipp

Thomas Herfet

Dieter Fischer

Thomas Bonse

Wolfgang Paschedag

Arno Beckenbach

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.

Device for correcting still image errors in a video signal

The invention realtes to a film scanner comprising a frame sensor () for picking up film frames, and a scanning device () at least for scanning a sprocket hole associated with a film frame. To determine the position of a sprocket hole, the film scanner comprises an evaluation device () which is provided to determine, in given areas, edge positions in a measuring frame supplied by the scanning device (), form lines from the determined edge positions and determine the deviation of the center of the sprocket hole from a reference center.

Film scanner with film weaver correction facility

A method of correcting picture steadiness errors (or film weave correction) in telecine scanning is proposed, in which, in a first step, at least one sample area of the picture contents of the video signal obtained by film scanning is determined by way of structure recognition, this sample area corresponding to a curvature in the picture contents. In a second step, it is checked, by way of comparison, whether the determined sample areas are recognizable in a search area of the sequential frame. In a third step, motion vector signals are generated when the sample areas are recognized again in the sequential frame, these motion vector signals defining the direction of motion and the extent of deviation of the position of the determined sample area from the position of the recognized sample area. In a fourth step, parameters of a transform function are determined by the motion vector signals. In a subsequent fifth step, motion vectors, which correspond to partial motions, are recognized and eliminated by comparing the transform function with the motion vectors. Steps four and five are performed several times, if necessary. In a sixth step, correction signals are derived by taking the temporal sequence of transform functions into account, and in a seventh step, these correction signals are applied to a control device, these correction signals correcting the stability errors in the picture signals.

Method and arrangement for correcting picture steadiness errors in

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Schwerte, Germany

Thomas Leonard