| 摘要 |
<p>The invention relates to a method of preprocessing data that correspond to arbitrarily shaped objects and comprise for each object a texture part and an object mask, said method comprising, for each object plane associated to an object, the steps of: (1) partitioning the object plane into bidimensional blocks; (2) introducing in each block a set of basis vectors chosen in order to express an estimate of the original pixel values as a linear combination of said basis vectors; (3) defining a cost function V to measure the distortion between the original expression of the pixel values and said estimate of this original expression; (4) finding the coefficients allowing to minimize said cost function A, said finding step itself comprising the following operations : initialization, extraction of the basis vectors restricted to the opaque pixels and calculation of projection coefficients, iterations, and interruption of said iterations according to a predetermined criterion.</p> |
