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158results about How to "Accurate projection" patented technology

Method And Device For Representing A Digital Image On A Surface Which Is Non-Trivial In Terms Of Its Geometry And Photometry

The invention relates to a method and a device for representing a two-dimensional digital image on a projection surface, whereby at least one projector projects the content of an image buffer onto the projection surface. The aim of the invention is to provide a method and a device which allow to project a digital image onto a background having any surface structure and / or color in such a manner that any influences on the image caused by the background are compensated to the last pixel for at least one special observer perspective. In a special embodiment, definition of the representation is optimized to the last pixel even on an uneven background. For this purpose, the digital image is processed during a rendering step by geometrically distorting it using a two-dimensional pixel-offset field which contains information on the projection surface, and by manipulating the color of the image by means of a two-dimensional surface texture of the projection surface. A least a part of the processed image is rendered in an image buffer and a rectangle is written into the image buffer for initiating the rendering step, thereby compensating scattered light influences. The invention especially relates to a system comprising a plurality of projectors. Definition of representation can be optimized to the last pixel by means of definition values and representation is furthermore possible subject to the observer's position.
Owner:VIOSO GMBH

System and method for positioning heliostat

The invention discloses a system for positioning a heliostat. The system comprises a central receiver, the heliostat, a two-dimensional servo system platform, a CCD (Charge Coupled Device) detector, a laser ranging device, a main controller, a flash light emitter and a total reflecting prism. The invention further discloses a method for positioning the heliostat based on the system. The method comprises the following steps of: (1) adjusting the two-dimensional angle of the laser ranging device by using the two-dimensional servo system platform; (2) capturing the heliostat to be measured by using the CCD detector and the flash light emitter; (3) judging the size of the deviation between a laser facula and the center point of the heliostat by using the CCD detector, and controlling and rotating the two-dimensional servo system platform to adjust laser, so that the laser can shot the center of the heliostat; (4) measuring the distance from a laser emission point to the center point of the heliostat by using the laser ranging device; and (5) repeating the steps (1) to (4) to obtain the actual coordinates of the center point of the heliostat according to the distance from the laser ranging device to the center point of the heliostat and the position coordinates of the laser ranging device. According to the system and the method disclosed by the invention, the actual coordinates of the heliostat can be accurately calculated so as to accurately position the heliostat.
Owner:ZHEJIANG SUPCON SOLAR TECHNOLOGY CO LTD

Grading design method of skeleton dense structure for grading macadam base

InactiveCN103342483AEvaluation forceStrong correlationFilling materialsEngineering
The invention discloses a grading design method of a skeleton dense structure for a grading macadam base. The method comprises: using a dynamically controlled classification criteria for coarse and fine aggregates proposed by a Bailey method to classify particle sizes of the coarse and fine aggregates, with the coarse aggregates being used as skeletons and the fine aggregates being used as filling materials; using a graded embedding method to design the coarse aggregates, determining a coarse aggregate proportion by using a California bearing ratio and a frame gap rate as design specifications; and calculating an amount of the fine aggregates according to a coarse aggregate skeleton gap under the proportion of the coarse aggregate after the coarse aggregate skeleton part is designed, wherein a calculation method can refer to a calculation method of the fine aggregates in the Bailey method, and in order to ensure adequate filling, a tight-packing density is selected as a design density for the density of the fine aggregates. The graded gravel design method provided by the invention can meet engineering requirements, and is operable and relatively perfect, so that the graded gravels are guaranteed to have relatively good mechanical properties and endurance, thereby not only providing technical supports for application of the graded gravels, but also providing references for improvements of relevant norms.
Owner:CHANGAN UNIV
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