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公开(公告)号：JPH11225334A
公开(公告)日：1999-08-17
申请号：JP32157498
申请日：1998-11-12
Applicant: ST MICROELECTRONICS SRL
Inventor： PAU DANILO , ROVATI FABRIZIO , VALSASNA ANNA , BRUNI ROBERTA
Abstract: PROBLEM TO BE SOLVED: To obtain a device which calculates the dispersion value of a macroblock of a digital video by outputting the square value of an image that is continuously inputted, inputting each pixel of the macroblock, counting up, resetting a counter simultaneously with the input of a final pixel, transmitting the pixel value and square value of a pixel to an accumulator and storing accumulative result value of the accumulator. SOLUTION: For an algorithm that is executed by an accelerator for dispersion value calculation, a simple counter LC is used and two demultiplexers transmit an input line which processes in a method such as decides to which dispersion value a prescribed input pixel belongs to eight separate dispersion value operation paths. Relating to a prescribed line pattern in which a macroblock is scanned, as a rule, the bit of the counter LC that drives multiplexers is selected so that a dispersion value can be accurately operated. The counter LC is reset at the time of starting each macroblock and is counted up by the input of each pixel.
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公开(公告)号：JPH11251919A
公开(公告)日：1999-09-17
申请号：JP33213498
申请日：1998-11-24
Applicant: ST MICROELECTRONICS SRL
Inventor： PAU DANILO , BRUNI ROBERTA
Abstract: PROBLEM TO BE SOLVED: To reduce a required memory capacity by providing a more efficient method for selecting a quantizer. SOLUTION: This memory required amount reduction method is for reducing a memory required amount for temporarily storing the stream of a digital data block in the encoding/decoding system of information capable of being transferred by a block unit. Data are compressed, encoded and stored in a memory by the block unit by tree search vector quantization(TSVQ), and in a read stage, the encoded and compressed data are decoded and extracted and the stream of the digital data block is reconstituted.
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公开(公告)号：DE69735262D1
公开(公告)日：2006-04-20
申请号：DE69735262
申请日：1997-11-24
Applicant: ST MICROELECTRONICS SRL
Inventor： PAU DANILO , BRUNI ROBERTA
Abstract: The memory requisite of MPEG decoders and SQTV (or IQTV) systems may be reduced by recompressing the MPEG decoded data stream before storing pixels in an external RAM. An efficient compression method based on the tree-search vector quantization (TSVQ) as proposed for recompressing video picture data may be rendered even more effective by optimizing the way the quantizer is chosen for quantizing the differences among adjacent pel vectors. The method herein disclosed is based on premultiplying a read-only table using quantized complexity measures relative to the centroids of the tree-like scheme used in the TSVQ processing, producing a plurality of precalculated tables of quantization of the prediction error of a physical parameter of blocks of digital data. For each one of the regions in which a block is divided, the calculated and quantized complexity measure provides an address that selects the most appropriate precalculated table for quantizing the prediction error. A hardware architecture implementing said method is disclosed.
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公开(公告)号：DE69734386D1
公开(公告)日：2006-03-02
申请号：DE69734386
申请日：1997-02-06
Applicant: ST MICROELECTRONICS SRL
Inventor： PAU DANILO , BRUNI ROBERTA , SANNINO ROBERTO
IPC: H04N5/92 , G06F17/30 , G06T9/00 , G06T9/40 , H03M7/30 , H04N1/00 , H04N7/01 , H04N7/26 , H04N7/32 , H04N7/50 , H04N19/94
Abstract: The RAM requisite for temporarily storing a stream of digital data blocks in a coding/decoding system of information transferable by blocks may be significantly reduced by compressing and coding the data by blocks through a tree search vector quantization (TSVQ), storing TSVQ compressed and coded data in the RAM and decoding and decompressing during the subsequent reading of the data stored in the RAM thus reconstituting the stream of digital data blocks.
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