发明名称 |
A method of compressing digital images |
摘要 |
<p>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. <IMAGE> <IMAGE></p> |
申请公布号 |
EP1173024(B1) |
申请公布日期 |
2004.03.03 |
申请号 |
EP20000202436 |
申请日期 |
2000.07.10 |
申请人 |
STMICROELECTRONICS S.R.L. |
发明人 |
BRUNA, ARCANGELO;MANCUSO, MASSIMO;GALLUZZO, AGOSTINO |
分类号 |
G06T9/00;H04N19/126;H04N19/14;H04N19/149;H04N19/18;H04N19/186;H04N19/196;H04N19/60;(IPC1-7):H04N7/30 |
主分类号 |
G06T9/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|