Abstract: Block-based coding of a picture is done by providing an intra-prediction coding concept according to which a certain block of the picture is intra-prediction coded using a certain intra-coding mode by partitioning the predetermined block into partitions which are, for reconstruction purposes, sequentially subject to spatial prediction using the intra-prediction coding mode signaled for the certain block followed by correcting the thus obtained predictor using a prediction residual so that for preceding partitions a reconstruction of the samples is available to the decoder at the time of processing the next, then current, partition.

Abstract: In order to be able in a simple manner to supply one or more suction pick devices periodically moved relative to the surface of a stack with driving energy, the suction pick-up device is connected to an air volume or source having substantially constant negative pressure over overpressure, and a valve assembly that periodically connects the suction pick-up device to the outside air. The valve assembly is incorporated in the connecting line between the suction pick-up device and the air volume. The valve assembly may be embodied with a control piston that is subject to the action of a restoring force, by a pneumatic multi-way valve having a regulattable frequency, or by a magnetic valve connected to a regulattable frequency generator.

Abstract: In order to accomplish the separation and further conveyance of the uppert sheet of a stack of sheets by the simplest possible means, an elastic friction finger resting with slight pressure on the uppermost sheet of the stack is provided, which is set into reciprocating motion in a direction (A-B) that is inclined by a certain angle (.alpha.) relative to the surface of the stack, the movement having a low amplitude and a relatively high frequency. The stack itself is inclined backward relative to the horizontal by a certain angle (.beta.). The drive of the friction finger may be effected by means of a bellows connected to a valveless pump, by a pneumatic cylinder, or by a crank drive. It is also possible to connect a pneumatic cylinder, provided with vent bores controlled by the piston, to a supply line that is at constant negative pressure or overpressure.