H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/28 (2006.01)
Patent
CA 2091920
A method and all apparatus for representing picture by data compression are provided. The method comprises dividing the picture into regions, registering the value of a brightness function, fixing a characteristic scale for each region, dividing the region into cells having a linear dimension in the order of the characteristic scale, identifying basic structures in each cell, representing said structures by models, and storing and/or transmitting data defining the models, which data represent the primary compression of the picture and can be further compressed or otherwise processed. The apparatus comprises means for carrying out the several steps of the method. The basic structures may be chosen from among predetermined lists and such structures are described. In a preferred aspect of the invention they are identified and represented by constructing geometric models representing them, associating to each geometrical model a mathematical model, condensing said geometrical or mathematical models to define a global model for each cell and encoding and quantizing the data defining the global model. Methods are described for constructing the geometric models, based on the distribution of the values of the brightness function by determining a grid, determining an approximating function, at each point of the grid, and comparing the values of the derivatives and gradients of the approximating function with a predetermined set of thresholds. When representing color pictures, the method is applied successively to each of the basic colors or to a luminance signal and two reduced bandwidth colour- information carrying signals obtained by known transformation of colour data. An image of the original picture can then be produced from the compressed data, and it may be a faithful image or a desired transformation thereof, if the compressed data have been correspondingly transformed. Various application of the invention are described, comprising the application to video sequences.
Briskin Miriam
Elihai Yoram
Yomdin Yosef
Barrigar & Moss
Igp Research And Development Ltd.
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