36results about How to "Fast and accurate evaluation" patented technology

The invention discloses an on-orbit satellite image geometric positioning accuracy evaluation method on the basis of multi-source remote sensing data. The on-orbit satellite image geometric positioning accuracy evaluation method comprises the following steps: Step 1, regulating an image to be evaluated and a reference image into two images under the condition of the same spheroid, datum plane and resolution; Step 2, carrying out down-sampling on the two images and carrying out radiometric enhancement; Step 3, carrying out rough matching on the two images by using an Surf (Speed up robust features) algorithm and removing mismatched dot pairs by epipolar geometry; Step 4, according to a rough matching result, carrying out geometrical relationship compensation on the image to be evaluated and carrying out accurate blocking on the image to be evaluated, which is subjected to geometrical compensation, and the reference image; Step 5, aiming at block pairs of the image to be evaluated and the reference image, carrying out precise matching by using the Surf algorithm and removing mismatched dot pairs by epipolar geometry; Step 6, calculating external geospatial positioning accuracy and calculating internal geospatial positioning accuracy according to the screened direction control dot pairs. The on-orbit satellite image geometric positioning accuracy evaluation method can realize automatic, rapid and accurate evaluation on multisource high-accuracy remote sensing images from different sensors, different spectral regions and different time phases.

A device (100) for processing an input signal (102), the device (100) comprising a delay unit (104) adapted for delaying the input signal (102) by a predefined delay time, at least one phase shifting unit (106) each adapted for phase shifting the delayed input signal (108) by an assigned phase value, a plurality of mixer units (110) each adapted for mixing the input signal (102) with the delayed input signal (108) or with one of the at least one phase shifted signal (112), and an extraction unit (114) adapted for extracting information from each of the mixed signals (116).

The invention discloses a rapid evaluation method for the electrochemical corrosion resistance of a metal bipolar plate coating of a fuel cell, comprising the following steps: firstly, obtaining the contact resistance data of the coating after different corrosion times under a constant potential; then comparing the obtained contact resistance value to Perform exponential regression on the corrosion time, or perform linear regression on the logarithmic value of the contact resistance against time to obtain the corresponding growth coefficient of the potential; then introduce the contact resistance measurement error function; then combine steps 1, 2 and 3 to obtain the contact resistance and corrosion potential , corrosion time, to achieve the purpose of off-line test to quickly evaluate the electrochemical corrosion resistance of the metal bipolar plate coating of the fuel cell. The method of the invention can quickly evaluate the method and improve the performance evaluation accuracy; the method of the invention evaluates the tolerance of the coating to different corrosion potentials; the equipment adopted in the invention is simple and easy to control, and reduces the time and cost of online service testing.

The invention discloses a quick evaluation method and system for susceptibility to post-earthquake secondary geological disasters. The method comprises the steps of determining evaluation indexes of the susceptibility to the post-earthquake geological disasters, digitizing each evaluation index, conducting discretization on continuous variables to obtain sample points in sample areas, calculatingthe occurrence proportion of the geological disasters within discrete partitions corresponding to the evaluation indexes to determine the corresponding fitting functions of each evaluation index, inputting values of each evaluation index in each sample point into the corresponding fitting functions to obtain sensitivity calculation results, determining an evaluation model of an quick evaluation ofthe susceptibility to the post-earthquake secondary geological disasters, for any to-be-evaluated points, substituting the sensitivity calculation results corresponding to each evaluation index of the to-be-evaluated points into the evaluation model, the closer an acquired value is to 0, the less likely the evaluation point is to have the post-earthquake geological disaster, and the closer the acquired value is to 1, the more likely the evaluation point is to have the post-earthquake geological disaster. By means of the method, the accuracy of an evaluation of the susceptibility to the post-earthquake secondary geological disasters is improved.

The invention discloses an image measuring method for evaluating oil pipe pitting behaviors. By means of the corrosion weight loss method and the micro-measurement technology, a proper datum plane is built on the surface of a slide through a coating method, proper temperature, proper pressure and a proper medium are selected, different corrosion time is controlled, the number and the size of pitting generated on the surface of the slide are effectively controlled, then large-scale image scanning is conducted on the slide through a measurement microscope, image information of a metal surface at the same position before corrosion and after corrosion is compared, and accordingly evaluation in the aspects of generation and development positions of pitting on the surface of an oil pipe, the number, the pit size and appearance is achieved. Relative information of a large amount of pitting can be obtained qualitatively and quantitatively, important bases are provided for researching generation and development of the oil pipe pitting behaviors, and the method has important research and application value.