Siemens Aktiengesellschaft

Siemens Aktiengesellschsft

Jens-Günter Bialkowski

André Kaup

Andrë Kaup

Where a quantized data value is produced by a first quantization of an input data value, followed by a first inverse quantization and subsequently by a second quantization and the first quantization has first quantization intervals and the second quantization has second quantization intervals, third quantization intervals are generated by displacing interval boundaries of the second quantization intervals, respectively, to the next interval boundaries of the first quantization intervals. A third reconstruction value is determined for the third quantization intervals such that the third reconstruction value lies within the associated third quantization intervals. A corrected data value is generated by a third inverse quantization of the quantized data value and the third inverse quantization is affirmed by the third quantization intervals containing the associated third reconstruction value.

Method for correcting a quantized data value and associated device

An input data stream coded using a first coding method and containing at least one coded digitized image is converted into an output data stream that is coded using a second coding method. The input data stream has first intra-blocks, each of which is coded in a first prediction mode of a plurality of first intra-prediction modes, and the output data stream has second intra-blocks, each of which is coded in a second prediction mode of a plurality of second intra-protection modes. The second prediction modes of one or more second intra-blocks are determined with the aid of the first prediction modes for one or more first intra-blocks and the second intra-blocks are coded using the second prediction modes that are thus determined. In particular, prediction errors that are assigned to the first intra-blocks are taken into consideration for the determination of the second prediction modes.

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Nürnberg, Germany

Jens-Günter Bialkowski