公开(公告)号：JP2003179925A

公开(公告)日：2003-06-27

申请号：JP2002275956

申请日：2002-09-20

Applicant: ST MICROELECTRONICS SRL

Inventor： BARTOLUCCI VILIM ,  PAU DANILO ,  EMILIANO PICCINELLI

IPC: H04N7/30 ,  G06T9/00 ,  H03M7/30 ,  H04N7/50 ,  H04N19/94

Abstract: PROBLEM TO BE SOLVED: To provide a method for compressing a signal at a higher level compression while maintaining the same quality level and main features of MPEG2 standards. SOLUTION: The process for compressing a digital video signal comprises the steps of starting a frame for constituting the digital video signal from a microblock for receiving movement compensations (13, 14), dividing the frame into the blocks, assembling the set of the coefficient generated by using a discrete cosine transfer (15) so as to generate each set of the coefficients in each block, constituting them to the set of the vectors by masking (M 1 , M 2 , M 3 and M 4 ), detecting the dispersion of the vector, digitizing the vector for usable multiple bits by a pyramid vector digitizer (22), linking the vector to individual digitized pyramids having decided size in response to the number of usable bits, and encoding the digitized vector by corresponding code word. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003163932A

公开(公告)日：2003-06-06

申请号：JP2002261167

申请日：2002-09-06

Applicant: ST MICROELECTRONICS SRL

Inventor： CONCION DAVIDE ,  EMILIANO PICCINELLI ,  PAU DANILO

IPC: H04N7/30 ,  G06T9/00 ,  H03M7/30 ,  H04N7/26 ,  H04N7/46

Abstract: PROBLEM TO BE SOLVED: To provide format conversion that is achieved by operation in a DCT region. SOLUTION: A DCT macroblock (MB) contained in an MPEG bit stream is divided into a plurality of microblocks (B1, B2, B3, and B4) each. After an important frequency component in each of DCT blocks (B1, B2, B3, and B4) is identified and stored, microblocks (mB1, mB2, mB3, and mB4) at the corresponding upper left portion are separated, and the coefficients of other microblocks are set to zero. Inverse discrete cosine conversion (16) is carried out to the separated microblocks (nB1, mB2, mB3, and mB4), and a merged block is generated by merging with the microblock obtained from other DCT blocks contained in each macroblock (MB). Discrete cosine conversion (20) is performed to the obtained merged block, and assembly is carried out to the macroblock (MBD) of the converted format for obtaining a final block. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2000125303A

公开(公告)日：2000-04-28

申请号：JP28845599

申请日：1999-10-08

Applicant: ST MICROELECTRONICS SRL

Inventor： LUCA PEZZONI ,  EMILIANO PICCINELLI ,  DANILO POU

IPC: H04N7/32 ,  G06T9/00 ,  H04N7/26

Abstract: PROBLEM TO BE SOLVED: To improve the efficiency of picture compression technology by recognizing the 3:2 pull-down conversion of some film photograms in a sequence of many TV frames, while repeating several pictures and removing redundancy caused by repeating of these pictures. SOLUTION: In a motion estimator, a motion estimation block executes prescribed communication with a block for detecting 3:2 pull-down. The block for detecting 3:2 pull-down has three functional sub-blocks, that is, 1st and 2nd sub-blocks respectively calculates tests (1), (2) for top and bottom fields, and the 3rd subblock controls whether or not these fields are to be repeated in correct order. Thereby a table indicating a repeated pattern of plural fields can be generated to express the position of a picture.