249results about How to "Reduce alignment errors" patented technology

A method and system for detecting drift in calibrated tracking systems used to locate features with respect to one or more coordinate systems allows medical devices to be accurately tracked within a reference coordinate system, and facilitates detection and compensation for changes in the orientation of the tracking system with respect to the coordinate system over time.

The present invention discloses a method of volume-panorama imaging processing, which generates a volume-panorama image by subsequently splicing respective image frames from an image sequence obtained in a real-time way or stored in a medium based upon the fact that the immediately adjacent image frames have the largest correlation. The method comprises the steps of: reading the image sequence, and firstly initializing an aligned image and a spliced image; dividing the i-th image frame Fi into a plurality of sub-regions; calculating a motion vector of the i-t image frame with respect to the aligned image; fitting the motion vector to calculate a transform coefficient; splicing the Fi to the current spliced image based upon the transform coefficient, and updating the aligned image; entering into a self-adaptive selection of a next image frame until the end of the splicing; and outputting the current spliced image as a resultant image. Additionally, when the image Fi is spliced, double-filtering architecture of selecting characteristic points through a filtering and selecting the valid motion vector of the selected characteristic points through the other filtering to reduce an alignment error may be adopted. According to the present invention, the volume-panorama imaging can be done quickly and accurately so that the reliability of images particularly meets a very high requirement of the ultrasonic iatric diagnose.

The invention discloses an alignment location device comprising a location platform, a first direction location device and a second direction location device, wherein the first direction location device drives a pair of first direction alignment baffle blocks protruding out of the location platform to synchronously and oppositely move through a first transmission mechanism by a first drive mechanism; the second direction location device drives a pair of second direction alignment baffle blocks protruding out of the location platform to synchronously and oppositely move through a second transmission mechanism by a second drive mechanism; and the two baffle blocks on the second direction are respectively arranged on two sides of a center connecting line of the two baffle blocks on the first direction, and a movement path of the two baffle blocks on the second direction is vertical to the movement path of the two baffle blocks on the first direction. The alignment location device realizes alignment location on two directions respectively through the two drive mechanisms, realizes that the located baffle blocks can move, and can adapt to location requirements of different sizes; and the two drive mechanisms can respectively ensure synchronization of the movement on the first direction and the second direction, thus the alignment rate is increased and the alignment error is reduced.

A method for aligning image data printed on a receiver medium in a multi-printhead printer that includes printing a test pattern including features separated by predefined test pattern feature separations, where some features are printed with a first printhead and some features printed with a second printhead. An image of the printed test pattern is analyzed to determine a first camera pixel separation between two features printed with the first printhead, which is used to determine a camera scale factor. The camera scale factor is used to scale a second camera pixel separation between a feature printed with first printhead and a feature printed with the second printhead. The scaled second camera pixel separation is compared to a corresponding test pattern feature separation to determine an alignment error, which is used to adjust the alignment of the image data printed with at least one of the printheads.