Abstract:
The invention concerns a method for encoding at least a source image using a hierarchical mesh defining at least two nested spaces corresponding each to a decomposition level of said meshing, which consists, at least at a decomposition level n (except the first decomposition level), in delivering only image coefficients expressed in a base of functions defined in a space orthogonal to the space corresponding to the preceding decomposition level n-1, said functions being selected so that said image coefficients enable to optimize for said decomposition level n the data already transmitted for the preceding decomposition level n-1, so as to produce a reconstructed image, representing said source image, with optimized restoration quality for said decomposition level n.
Abstract:
PROBLEM TO BE SOLVED: To represent the effects on a received signal of a radio communications channel having L paths with a reduced computational effort. SOLUTION: The method is achieved by transforming the representation of a channel into a simplified representation. The method comprises generating a plurality of complex zero mean gaussian random variables each having a predetermined variance, and summing the variables, to form a representation of the signal received via a radio communications channel. The predetermined variance of each variable is calculated from the eigen-values of a matrix formed from the correlation coefficients and a channel correlation matrix which includes the average attenuation of each of the L-paths. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To ensure quality of service without distinctly differentiating a real-time flow and a data flow. SOLUTION: An apparatus for processing a packet 20 of a flow on network includes a scheduling means 28 for scheduling packets in a queue according to fair queuing using priority algorithm. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a technique for watermarking in a video sequence with enhanced robustness, as compared to the techniques according to prior art. SOLUTION: A method for watermarking in the video image sequence includes the execution steps (11-16) for obtaining a watermarked motion vector, by inserting at least one watermark-in bit in at least one motion vector 51 obtained by the motion estimation between two images in the sequence concerned. The motion vector 51 is identified by a coordinate of the motion vector concerned in a reference space partitioned to complementary zones (Z1, Z2) of two types, each having an identifiable binary value related to the motion vector 51. In this insertion step, as necessary, the coordinate of the motion vector 51 is corrected, and as a result, the vector is positioned to lie within a binary value zone, corresponding to the watermark-in bit to be inserted. COPYRIGHT: (C)2005,JPO&NCIPI