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 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. <IMAGE> <IMAGE></p> |
申请公布号 |
EP1173026(A1) |
申请公布日期 |
2002.01.16 |
申请号 |
EP20000202438 |
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 |
H04N5/232;H04N5/235;H04N19/122;H04N19/126;H04N19/14;H04N19/149;H04N19/18;H04N19/186;H04N19/42;H04N19/60;(IPC1-7):H04N7/30;G02B7/36 |
主分类号 |
H04N5/232 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|