公开(公告)号：DE60008716D1

公开(公告)日：2004-04-08

申请号：DE60008716

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G06T9/00 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/196 ,  H04N19/60 ,  H04N7/30

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of splitting (455) the digital image into a plurality of blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each block using a corresponding quantization table scaled by a gain factor for achieving a target compression factor; the method further comprises the steps of determining (440) at least one energy measure of the digital image, and estimating (441-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to the target compression factor.

公开(公告)号：DE60039689D1

公开(公告)日：2008-09-11

申请号：DE60039689

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G02B7/36 ,  H04N5/232 ,  H04N5/235 ,  H04N19/122 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/42 ,  H04N19/60

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of providing (410-430) an incomplete digital image wherein at least one component is missing in each element, obtaining (433-435) the digital image from the incomplete digital image, splitting (455) the digital image into blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each group using a corresponding quantization table scaled by a gain factor; the method further comprises the steps of determining (440) at least one energy measure of the incomplete digital image and estimating (445-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to a target compression factor.

公开(公告)号：ITVI20110009A1

公开(公告)日：2012-07-27

申请号：ITVI20110009

申请日：2011-01-26

Applicant: ST MICROELECTRONICS SRL

Inventor： BOSCO ANGELO ,  BRUNA ARCANGELO ,  GIACALONE DAVIDE ,  ROSETTA RIZZO

公开(公告)号：DE60008716T2

公开(公告)日：2005-02-10

申请号：DE60008716

申请日：2000-07-10

Applicant: ST MICROELECTRONICS SRL

Inventor： BRUNA ARCANGELO ,  MANCUSO MASSIMO ,  GALLUZZO AGOSTINO

IPC: G06T9/00 ,  H04N19/126 ,  H04N19/14 ,  H04N19/149 ,  H04N19/18 ,  H04N19/186 ,  H04N19/196 ,  H04N19/60 ,  H04N7/30

Abstract: A method (400) of compressing a digital image including a matrix of elements each one consisting of a plurality of digital components of different type representing a pixel, the method comprising the steps of splitting (455) the digital image into a plurality of blocks and calculating, for each block, a group of DCT coefficients for the components of each type, and quantizing (460-465) the DCT coefficients of each block using a corresponding quantization table scaled by a gain factor for achieving a target compression factor; the method further comprises the steps of determining (440) at least one energy measure of the digital image, and estimating (441-450) the gain factor as a function of the at least one energy measure, the function being determined experimentally according to the target compression factor.

公开(公告)号：IT1404810B1

公开(公告)日：2013-11-29

申请号：ITVI20110009

申请日：2011-01-26

Applicant: ST MICROELECTRONICS SRL

Inventor： GIACALONE DAVIDE ,  BRUNA ARCANGELO ,  ROSETTA RIZZO ,  BOSCO ANGELO