A method for providing an magnetic resonance imaging (MRI) with nonrigid motion correction of an object is provided An MRI excitation is applied to the object A magnetic field read out from the object using a plurality of sensor coils Spatially localized motion estimates are obtained for each sensor coil of the plurality of sensor coils The motion estimates are used for each sensor coil to provide motion correction

Nonrigid motion correction in 3d using autofocusing with localized linear translations

An image printing device and method for printing an image to an information carrier. The image printing device includes apertures which can be selectively opened or closed to permit or restrict the transport of pigment particles during print sequences, a predetermined number of which print sequences are included in a print cycle, to thereby enable the formation of a pigment image. Further, deflection electrodes are included for, by means of predetermined deflection voltages related to each one of the predetermined number of print sequences, controlling the deflection of pigment particles in transport to thereby be able to deflect pigment particles against predetermined locations in view of the image which is to be printed. To enable a faster print speed, according to the invention, the change of the predetermined deflection voltages of a previous print sequence to the predetermined deflection voltages of a current print sequence is time displaced relative to the beginning of the current print sequence.

Direct electrostatic printing method and apparatus with increased print speed

The present invention relates to a direct electrostatic printing method, in which a stream of computer generated signals, defining an image information, are converted to a pattern of electrostatic fields which selectively permit or restrict the transport of charged toner particles from a particle source toward a back electrode and control the deposition of those charged toner particles in an image configuration onto an image receiving medium. Particularly, the present invention refers to a direct electrostatic printing method performed in consecutive print cycles, each of which includes at least one development period (tb) and at least one recovering period (tw) subsequent to each development period (tb), wherein the pattern of electrostatic fields is produced during at least a part of each development period (tb) to selectively permit or restrict the transport of charged toner particles from a particle source toward a back electrode, and wherein a supplemental voltage source is applied at the beginning of each development period to enhance the transport of the particle source at the beginning of each development period. Advantageously, an additional electric field is produced during at least a part of each recovering period (tw) to repel a part of the transported charged toner particles back toward the particle source. Preferably, the supplemental voltage source is supplied to a guard electrode so as to control the amount of toner attracted from the particle source by each aperture. By controlling the amount of toner attracted by each aperture, the boner may be distributed equally among the apertures thereby preventing toner starvation.

Direct printing method with improved control function

A direct electrostatic printing device and method for printing an image to an information carrier with increased density harmonization. This is attained by measuring the behaviour of the apertures and subsequently adjusting the control parameters of at least the diverging apertures. The measurement of the behaviour of the apertures is suitably performed by scanning a known print sample with a predetermined density. The scanned values are inverted around a predetermined value for which no compensation is done to create a compensation function. At least the apertures which have a behaviour which diverges from a predetermined behaviour are compensated according to the compensation function, thereby enabling an increased density harmonization. The compensation function can preferably be signal processed by, for example, a low pass filtering.

Direct electrostatic printing method and apparatus

The air jet filter (1) has a housing (2), where a filter (7) is arranged into the housing. A slot nozzle (6) is provided under a filter base (8). The filter machine has a measuring head (16), by which the particles are detected in the air flow. The measuring head is arranged in flow direction of the particle air flow after the filter base and before a downstream filter. An independent claim is also included for method for operating an air jet filter for a grain size analysis of a sample of a material.

Air jet sieve

An image preprocessor is disclosed for a DEP device, wherein the image preprocessor corrects digital image data before printing. 
The image pre-processor preferably performs at least one the following steps :
 1. correcting the image input density according to a first look up table (LUT) for obtaining a desired grey scale value, 2. correcting grey scale values by a second LUT for varying toner fluxes 111 through different printing apertures 107, said second LUT being desirable for adjusting the toner flux 111 to the differing distance of printing apertures 107 belonging to different rows of apertures 107, and for adjusting the toner flux 111 through various printing apertures 107 having varying aperture diameter or shape. This is referred to as a shading correction in a direction orthogonal to the print direction), 3. correcting grey scale value for the grey scale values of neighbouring pixels, that influence the toner flux 111 for forming the actual image pixel, referred to as neighbour compensation, 4. correcting grey scale values for the image density that has been printed through the individual printing aperture 107 prior to the actual printing the required pixel, called previous compensation, 5. correcting grey scale values for the hardware design of the printhead structure 106, i.e. assignment of image pixels to controlling IC number and output channel number per IC, 6. expressing grey scale values as a time modulated or voltage modulated output signal, 7. transferring image output signals in a serial data stream to a FIFO memory from which the output signals are preferably converted to a parallel data stream that is fed to driving IC's, that are used to put a voltage to the individual control electrodes 106a of the printhead structure 106 in the DEP device 100.

An image pre-processor in a device for direct electrostatic printing

An apparatus is disclosed for evaluating the triboelectrical properties of at least two samples, comprising a grounded means (1) for holding a material in sheet form comprising a support provided on at least one surface thereof with at least two samples each in at least one predefined region thereof; a charging means (4) for tribocharging the at least two samples; and a means (7) for measuring an electrical property of the at least two samples A method for evaluating an array of multiple samples on their triboelectrical properties with such an apparatus is also disclosed

Fast characterizing method for triboelectrical properties

Die Erfindung betrifft ein MR-Verfahren bei dem vor der eigentlichen MR-Untersuchung in einer Praparationsphase die Bewegung eines abzubildenden Objektes untersucht wird und bei dem in der anschliesenden MR-Untersuchung die dafur benotigten Sequenzen so modifiziert werden, dass die Bewegung kompensiert wird. The invention relates to an MR method in which before the actual MR examination in a preparation phase is analyzed by the movement of an object to be imaged and in which, in the subsequent MR examination, the sequences required for this purpose are modified such that the motion is compensated.

MRI method with motion compensation

Procédé d'IRM avec compensation de mouvement

Die Erfindung betrifft ein MR-Verfahren bei dem vor der eigentlichen MR-Untersuchung
in einer Praparationsphase die Bewegung eines abzubildenden Objektes untersucht wird
und bei dem in der anschliesenden MR-Untersuchung die dafur benotigten Sequenzen so
modifiziert werden, dass die Bewegung kompensiert wird.

Dirk c

Papers

An image pre-processor in a device for direct electrostatic printing

Fast characterizing method for triboelectrical properties

MRI method with motion compensation

Procédé d'IRM avec compensation de mouvement

MR-Bildgebungsverfahren mit Bewegungskompensation