U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Albert Van Der Werf

Richard Petrus Kleihorst

Wilhelmus H Bruls

Robert Albertus Brondijk

Marc Joseph Rita Op De Beeck

Paul Wielage

Leonardus Sevat

Lodewijk Bellefroid

Alexander M Rensink

A data processing device contains a time division multiplexed multiport memory. The timing of memory access is defined in time-slots for access to the memory from respective ports. Timing is generated asynchronously with a handshake in response to a ready signal indicating completion of access during a previous time-slot.

Device containing a multi-port memory

Method and arrangement for encoding a video signal, wherein a selection ( ) is made between the generation of a motion-compensated encoded video signal (I, B, P) and the generation of a higher-resolution picture (I ). The creation of the higher-resolution picture (I ) relies on estimating motion in a series of subsequent pictures (f . . . ) of lower resolution. The higher-resolution picture (I ) is interpolated ( ) from these pictures (f . . . ). In a preferred embodiment of the invention, previously determined regions of interest (S(ROI)) are selected ( ) from the video signal. The pictures relating to these regions of interest (f . . . ) occupy less memory ( ) than entire pictures as picked up by an image sensor ( ). A conventional picture memory ( ) is sufficient to store the series of pictures (f . . . ) that relates to a certain region of interest. Motion estimation ( ) is performed on these pictures and their motion vectors (m) are stored in a vector memory ( ). The higher-resolution pictures (I ) are interpolated ( ) from the stored pictures (f . . . ) and their motion vectors (m). The invention is applicable for sensor ( )-encoder ( ) integration, for example in a camera system ( ).

Encoding a video signal

A system encodes an input video signal by subjecting the input video signal to noise reduction to obtain a noise-reduced signal, and encoding a difference between the noise-reduced signal and a prediction signal to produce an encoded signal. The system then decodes the encoded signal to obtain the prediction signal. In the system, the noise-reduction step comprises arithmetically combining the input video signal with the prediction signal.

Method and arrangement for encoding a video signal

Optimal design method and apparatus for synchronous digital circuits by retiming through selective flipflop positioning and electronic circuit configuration produced by executing the method. The method is for designing a synchronous digital electronic circuit that comprises cells and clocked flipflops interconnected by nets and running at a predetermined clock period, operates as follows. First, uniform-directedly as starting from any cell for any sub-path emanating therefrom its associated delay is accumulated. Next, if for such sub-path the accumulation result exceeds a predetermined integer number of clock periods. The sub-path in question is signalled for subsequent provision with such integer number of flipflops and its accumulation is terminated. Finally, all elementary cell-to-cell connections are provided with flipflops in minimal accordance with said signalling. The invention is particularly advantageous with large circuits such as used in digital video processors and with small clock periods.

Optimal design method and apparatus for synchronous digital circuits by

A variable length decoder device receives a stream of variable-length encoded data segments for successive transient storage. The storage is recurrently accessed under control of successive pointers. A decoder is fed by the storage and decodes a stream of data segments each from a respective encoded data segment. Furthermore, in step with the decoding a next pointer is produced as being directly derived from the accessing through reading of a localizer information. The latter again is produced in a preprocessor that sits before the storage, through localizing the data segments and indicating each segment by an associated localizer.

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Eindhoven, Netherlands

Albert Van Der Werf