Method of compressing digital images

Details Method of compressing digital images Method of compressing digital images

2005-01-04

2005-01-04

Couso, Jose L. (Department: 2621)

Image analysis

Image compression or coding

Adaptive coding

Reexamination Certificate

active

06839467

ABSTRACT:
A method compresses a digital image including a matrix of elements each one including a plurality of digital components of different type representing a pixel. The method includes the steps of providing an incomplete digital image wherein at least one component is missing in each element, obtaining the digital image from the incomplete digital image, splitting 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 the DCT coefficients of each group using a corresponding quantization table scaled by a gain factor for achieving a target compression factor. The method further comprises the steps of determining an energy measure of the incomplete digital image and estimating the gain factor as a function of the energy measure, the function being determined experimentally according to the target compression factor.

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