摘要:
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−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 WV0(n) thus obtained with the previously generated static image M(n−1). According to the invention, an additional step for computing, for each picture element of the current video object, a weighting coefficient wWF(n)[x,y] correlated to the error between the warped video object and the static image M(n−1) is provided, and the blending formula now takes into account said weighting coefficients.
摘要:
Pulley device for a rotary machine, and in particular a compressor, comprising a pulley, a rolling bearing, a torque transmission plate having an axial sleeve designed to be mounted on a rotary spindle of the rotary machine and a radial plate extending radially from the axial sleeve and having the general shape of a disc, said pulley being mounted on an outer ring of the rolling bearing and on the torque transmission plate, the torque transmission plate being able to transmit a rotational movement from the pulley to the rotary spindle.Said pulley device comprises a damping element located between the pulley and the torque transmission plate.
摘要:
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−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−1), and a fourth step for computing, for each picture element of the current video object, a weighting coefficient WWF(n)[x,y] correlated to the error between the warped video object and the static image M(n−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.
摘要:
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.
摘要:
Pulley device for a rotary machine, and in particular a compressor, comprising a pulley, a rolling bearing, a torque transmission plate having an axial sleeve designed to be mounted on a rotary spindle of the rotary machine and a radial plate extending radially from the axial sleeve and having the general shape of a disc, said pulley being mounted on an outer ring of the rolling bearing and on the torque transmission plate, the torque transmission plate being able to transmit a rotational movement from the pulley to the rotary spindle.Said pulley device comprises a damping element located between the pulley and the torque transmission plate.
摘要:
A global motion estimation method between an incoming frame F(n) of a sequence of frames and a large static image M(n−1), which is constructed from previous frames F(1), F(2), . . . , F(n−1) of the video sequence, uses a motion model based on a two-dimensional perspective transform that contains eight motion parameters. The eight motion parameters are the coordinates of the four vertices of the incoming frame. The motion estimation method enables any displacement of the four corners of the original rectangular image to fit the next one by optimizing a cost function. Useful applications include those related to MPEG-4 and, more especially, to MPEG-7 standard, such as sprite generation or mosaicing.
摘要:
The present invention relates to a process for the synthesis of isocyanates and of isocyanate derivatives. Isocyanates are obtained by reacting an organic halide with a metal cyanate in an organic medium in the presence of a catalyst consisting of a complex of nickel with at least one organic ligand, in which complex the nickel is in the zero oxidation state.A carbamate or a urea, respectively, are obtained by a subsequent reaction with a hydroxy compound or a primary or secondary amine.Isocyanates and their derivatives are used especially either as refined synthesis agents for the production of pesticides and medications, or as monomers or comonomers for the preparation of many macromolecular compounds.
摘要:
The present invention relates to a process for the synthesis of isocyanates and of isocyanate derivatives. Isocyanates are obtained by reacting an organic halide with a metal cyanate in an organic medium in the presence of a catalyst consisting of a complex of nickel with at least one organic ligand, in which complex the nickel is in the zero oxidation state.A carbamate or a urea, respectively, are obtained by a subsequent reaction with a hydroxy compound or a primary or secondary amine.Isocyanates and their derivatives are used especially either as refined synthesis agents for the production of pesticides and medications, or as monomers or comonomers for the preparation of many macromolecular compounds.