35 results about "Characteristic ratio" patented technology

The present application relates to a method, an apparatus and a storage medium for locating QR codes. For automatically locating a plurality of QR codes in image of any size, the invention provides an apparatus for locating at least one QR code in an image, comprising: characteristic ratio detection means for detecting the potential QR code location symbol areas by carrying out a plurality of detections for detecting the characteristic ratio of the QR code; critical edge detection means for detecting the critical edges of the potential QR code location symbol areas so that the false areas are excluded; location symbol grouping means for matching the detected QR code location symbol areas into potential QR codes; and verification means for excluding the false QR codes. The invention also provides a corresponding method for locating at least one QR code.

An apparatus and method is presented for controlling the quality of a mass density measurement of a multiphase fluid mixture including a plurality of fluid fractions and a plurality of constituting elements. The method includes the steps of: submitting a measuring pipe to a flux of high energy photons and measuring count rates; determining a mass density of the multiphase fluid mixture based on count rate measurements in a first and second energy windows; determining an electronic density of the multiphase fluid mixture based on count rate measurements in a third energy window; and comparing the electronic density to the mass density of the multiphase fluid mixture.

A transducer array for high-intensity focused ultrasound tumor treatment belongs to the field of medical equipment. The present invention is composed of a matching layer and a piezoelectric ceramic sheet. The matching layer is a concave spherical thin-shell bowl-shaped acoustic radiation layer with uniform thickness. All piezoelectric ceramic sheets are glued on the outer surface of the same matching layer. Multiple identical Piezoelectric ceramic sheets constitute a large-aperture co-concave spherical compact mosaic transducer array. The invention has a high array focused sound intensity ratio and symmetrical focused sound field characteristics; the piezoelectric ceramic sheet area of ​​each array element is small, and the manufacturing cost is low; the number of array elements and the number of power amplifier channels are small, and the power amplifier, phase shifting The consistency of the transducer and the matching network is easier to realize, manufacture, and adjust, and the stability and reliability are greatly improved; the common matching layer provides a firm support for the transducer array element, and resonant reinforcement occurs together with the array element The consistency of the resonance of each array element is ensured, and the output sound power of the array is maximized.

The invention discloses a radio-frequency source frequency calibration method for jump frequency from direct tracing to a high excited state. According to the method, energy level splitting is produced by using the quantum interference effect of high excited atoms under the action of a radio-frequency field and an electric field, and the frequency of the measured radio-frequency field can be effectively traced to the energy level interval of atoms by measuring the characteristic ratio of two split transmitted spectrum peaks. The frequency measuring basis can be directly compared with the jump frequency of atoms, so that the accuracy of frequency measurement is effectively improved. The method can directly trace the frequency of the radio-frequency field to the jump frequency of atoms, a new method is provided for the frequency measurement of the high radio-frequency field, and the method has good measurement accuracy and self-calibration property.