256results about How to "Correct deviation" patented technology

Disclosed herein is a portable electronic device including an operation surface for inputting an operating action of a user, detecting means for detecting the coordinates of a point of contact of a user's finger with said operation surface, a memory for storing information representing a deviation between the coordinates of a point on said operation surface where the user desires the user's finger to touch said operation surface and the detected coordinates of the point of contact, and correcting means for correcting said deviation based on the stored information.

An apparatus (10) includes a device for acquiring a plurality of images of an identical subject taken from a plurality of viewpoints; a device for selecting a prescribed image as a reference image, selecting an image other than the reference image as a target image from among the images, and detecting feature points from the reference image and corresponding points from the target image to generate pairs of the feature point and corresponding point, wherein feature of the feature point and the corresponding point in the same pair are substantially identical; a device for estimating geometrical transformation parameters for geometrically-transforming the target image such that y-coordinate values of the feature point and the corresponding point included in the same pair are substantially identical, wherein y-direction is orthogonal to a parallax direction of the viewpoints; and a device for geometrically-transforming the target image based on the parameters.

An inkjet recording apparatus includes: a treatment liquid deposition device which deposits a treatment liquid insolubilizing or aggregating inks of a plurality of colors, onto a recording medium; a recording head which has a plurality of nozzles ejecting the inks onto the recording medium on which the treatment liquid has been deposited; a data acquisition device which acquires density data of an image with respect to each color, the density data corresponding to the plurality of colors; a higher-order color correction device which corrects the density data, wherein when the inks of different colors are ejected in ejection order so that a preceding ink ejected precedingly to form a lower layer and a subsequent ink ejected subsequently to form an upper layer overlap each other, the higher-order color correction device corrects the density data for a nozzle ejecting the subsequent ink according to the density data for a nozzle ejecting the preceding ink; and an ejection controller which controls ejection of the inks from the recording head according to the density data that the higher-order color correction device has corrected in such a manner that the image is formed on the recording medium.

An illumination device includes: a light emitting element to be a light source; a light amount detecting means for detecting the amount of light emitted by the light emitting element; a light emitting element drive means for controlling drive current supplied to the light emitting element so that the difference between the light mount detected by the light amount detecting means and a light amount target value becomes small; a junction temperature detecting means for calculating junction temperature of the light emitting element; and a setting means for setting the light amount target value in accordance with the junction temperature detected by the junction temperature detecting means.

An image forming apparatus includes: a rotating belt which rotates around a roller; a drive section which rotates the belt; a detection section which detects a position of the belt in a width direction; a moving section which moves the belt in the width direction; a control section which corrects a deviation of the belt by controlling the moving section. The control section conducts a preparatory operation in which the control section changes an amount of control to be given to the moving section under the condition where the belt is rotated to obtain a correction data showing a relation between the amount of control and a change of a position of the belt in the width direction detected by the detection section, stores the correction data in a memory section, and then corrects the deviation based on the correction data stored in the memory section.

In a synchronous motor control device that corrects a deviation in rotational position which is related to a rotational position detector for a synchronous motor on which vector-control is performed, the synchronous motor control device includes: a current instruction generator that disables a torque instruction to set d-axis and q-axis current instructions as zero when a phase correction instruction is inputted; a current controller that outputs d-axis and q-axis voltage instructions based on the d-axis and q-axis current instructions; a phase correction quantity detector for determining the amount of offset in which the d-axis voltage instruction becomes zero when the phase correction instruction is inputted and the d-axis voltage instruction is not zero; an adder for adding a rotor positional angle and the amount of offset; and a voltage converter for determining three-phase voltage instructions based on the additional value, the d-axis and q-axis voltage instructions.

A high-frequency voltage whose amplitude is small is applied as a d-phase command voltage, and an excitation phase is changed to a predetermined degree at predetermined intervals, whereby a motor is driven. As the d-phase command voltage has the small amplitude and high frequency, the rotor of the motor does not rotate. A d-phase feed back current is detected, and the product of a derivative of the d-phase feed back current by the high-frequency voltage command is calculated. A high-frequency component is removed from the product. An excitation phase (direction of a magnetic flux) associated with a deviation of 0 or π from the position of a magnetic flux and also associated with a peak value assumed by the product having the high-frequency component removed therefrom is detected. A plurality of thus detected excitation phases is averaged in order to determine the direction of a magnetic flux. The excitation phase associated with one of two peak values assumed by the product is adopted on a fixed basis. Positive and negative rectangular waves having a magnitude causing magnetic saturation are applied as d-phase voltage commands. The polarity of a magnetic pole is determined based on positive and negative d-phase feed back currents. As the direction of a magnetic flux and the polarity thereof are detected separately from each other, the position of a magnetic pole can be detected accurately and reliably.