63results about How to "Theoretical perfection" patented technology

The invention discloses a light rare earth ion absorbing material. The light rare earth ion absorbing material is prepared by the following primary raw materials: a carrier is 100 parts of a plant fiber (such as a wood fiber and a ramie fiber), an absorbing base is various kinds of condensed tannins (such as a oak tannin, a persimmon tannin and a pericarpium granati tannin). The light rare earth ion absorbing material comprises, by mass, 100-1000 parts of 0.8% oak tannin solution, or 100-1000 parts of 0.7% persimmon tannin solution, or 100-1000 parts of 0.8% larix gmelinli tannin solution, or 100-1000 parts of 0.5% pericarpium granati tannin solution. A cross linking agent is aldehydes (such as methanal and glutaraldehyde) or epoxy group (like dual-epoxy propane). The light rare earth ion absorbing material further comprises, by mass, 50-500 parts of 10% glutaraldehyde solution or 50-1000 parts of 3% dual-epoxy propane solution. The carrier and the absorbing base are cross linked in an acid solution, and an environmental-friendly material capable of absorbing the light rare earth ion is obtained. A maximum absorbing quantity is 427.0mg / g. Due to the fact that the light rare earth ion absorbing material only contains carbon (C), hydrogen (H) and oxygen (O) elements, after high temperature burning, recovering of the rare earth ion is convenient.

The invention provides a method for correcting geometric distortion of a text image. The method comprises the following steps of: extracting a text row, in a horizontal direction, of the text image, fitting the text row by using a B-spline curve to obtain a text row curve; estimating a vanishing point of a cylindrical surface straight bus, a text row tangent convergence line and a focal length parameter of a camera by using the tangent convergence symmetry of the text row curve; constructing latitude lines of an isometric grid for the fit text row curve by adopting a crossratio interpolation value; estimating a directrix of the cylindrical surface by using similar perspective projection transformation of the text row curve and constructing longitude lines of the isometric grid; estimatinga length-to-width ratio of the isometric grid by using the text row curves at the top end and the bottom end of the image; and mapping meshes of each isometric grid into a square grid through a deformation technology based on the grid to finish the correction of the geometric distortion of the text image. By the method, the problem that perspective distortion, nonlinear deformation distortion andcompound distortion of the perspective distortion and the nonlinear deformation distortion cannot be corrected at the same time in the prior art can be solved; therefore, total correction of the geometric distortion of the text image shot by the camera can be realized.