Koninklijke Philips Corporation N.V.

Thomson-csf

Michel Bonnet

C&eacute;cile Dufour

Jean-Pascal Duchemin

Oriol Sans Estrada

Francois Koelsch

Gerard Beuchet

Vincent Boutroux

Daniel Leguen

Method of global motion estimation between consecutive video pictures

The invention relates to a method and device for generating a large static image M(n), such as a sprite or a mosaic, from a video sequence including successive video objects. This method comprises a first step for estimating motion parameters related to the current video object V0(n) of the sequence with respect to the previously generated static image M(n&minus;1), a second step for warping this video object on the basis of the estimated motion parameters, a third step for blending the warped video object thus obtained with the previously generated static image M(n&minus;1), and a fourth step for computing, for each picture element of the current video object, a weighting coefficient W &lsqb;x,y&rsqb; correlated to the error between the warped video object and the static image M(n&minus;1), the blending formula then taking into account said weighting coefficients. According to the invention, the pixel-based weighting map is converted into a region-based one by means of a spatial filtering step based on a morphological segmentation, which allows to select regions that belong to foreground objects and to discard them as outliers before the blending step.

Static image generation method and device

The invention relates to a method and device for generating a large static image M(n), such as a sprite or a mosaic, from a video sequence including successive video objects. This method comprises a first step for estimating motion parameters related to the current video object V (n) of the sequence with respect to the previously generated static image M(n&minus;1), a second step for warping this video object on the basis of the estimated motion parameters, and a third step for blending the warped video object WV (n) thus obtained with the previously generated static image M(n&minus;1). According to the invention, an additional step for computing, for each picture element of the current video object, a weighting coefficient w &lsqb;x,y&rsqb; correlated to the error between the warped video object and the static image M(n&minus;1) is provided, and the blending formula now takes into account said weighting coefficients.

A process and an apparatus for epitaxy in a gaseous phase, producing thin and homogeneous layers of monocrystalline indium phosphide. The process comprises two steps. In the first step, the phosphine is decomposed in a pyrolysis chamber which extends through a kiln in accordance with the reaction: ##EQU1## Thereafter, in a second step, the phosphorus is reacted with triethylindium in an atmosphere of hydrogen and nitrogen: ##EQU2## The residual gases are drawn off by a vacuum pump.

Gas-phase process for the production of an epitaxial layer of indum

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Paris, France

Michel Bonnet