Licentia Patent-verwaltungs Gmbh

Aeg Aktiengesellschaft

Georg Kummerfeldt

Franz May

Winfrid Wolf

Wolfgang Schwerzel

Winfried Wolf

Volker Eisenhardt

A method of decoding coded image data, preferably coded according to CCITT Recommendsation H. 261, wherein the data stream is continuously monitored for transmission errors by utilizing the residual redundancy of the data stream, and pixel values reconstructed after the detection of a transmission error are not entered into the predicted-image memory until a subsequent starting code word for a frame or field has appeared.

Method of decoding coded image data utilizing transmission error

A process of frame-to-frame prediction coding in which a frame is broken down into a regular block scanning field of n x n pixels and then prior to each prediction, up to four prediction methods, namely (1) block-by-block displacement vector calculation, (2) object-related displacement vector calculation, (3) nullification of the displacement, and (4) nullification of the prediction, are monitored as to the data rate to be transmitted, and the prediction method that leads to the smallest prediction errors is selected for the transmission.

Method for motion-compensated frame-to-frame prediction coding

In a system for displacement vector searching in digital image analysis, sub-totals of the amount differences in gray value for the pixel data of two images are calculated in parallel for more than one pair of pixels. These sub-totals are subsequently added together in an accumulator unit. In a control computer connected to the accumulator unit, the displacement vector is determined by selecting the minimum of a number of such added values.

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Neu-Ulm, Germany

Georg Kummerfeldt