93 results about "Conversion equation" patented technology

Using image data on a plurality of reduced object images to calculate a shift amount in regard to the gap of relative positions between the reduced object images by a correlation calculation between the reduced object images. A conversion equation is obtained from the shift amount for geometric projection process from the object image to each of the reduced object images. Initial image data on a single object image is generated using image data on the plurality of reduced object images. This and the aforementioned conversion equation, are used to estimate images of each of the reduced object images. A difference between the estimated image of each of the reduced object images and each of the reduced object images is projected in the reverse process of the aforementioned geometric projection process, to update the image data on the single object image. The processes are repeated until the difference satisfies a predetermined condition and a high resolution object image is outputted.

A method for correcting A/D converted output data which corrects digital data obtained by A/D conversion of an analog signal, comprising forming an at least first order polynomial curve approximating an input/output characteristic curve of A/D conversion in a range of input of the analog signal, setting an ideal input/output characteristic line of A/D conversion, deriving a conversion equation for converting coordinates of a point on the approximation polynomial curve to a point of the ideal input/output characteristic line for the same analog signal value, and using this conversion equation to convert A/D converted digital data so as to correct non-linearity of the output data.

The invention provides a video quality evaluation method. The video quality evaluation method comprises the steps: analyzing container information of an uploaded source video, obtaining encoding form, encoding rate and discernable ratio of the video, obtaining the peak signal to noise ratio of the video after 1pass transcoding is finished, searching a code rate loss rate table of the encoding form to obtain the corresponding code rate loss rate according to the obtained encoding form of an uploaded source, computing a dynamic weighting factor of the video, obtaining the converted code rate from video sources of various encoding forms and different contents according to a conversion equation, substituting the converted code rate and the discernable ratio of the uploaded source video into a video quality evaluation classification table, and obtaining video quality classification by searching. The video quality evaluation method can be fused with a universal video transcoding framework easily and conveniently, under the situation of using little additional calculation amount, the quality of the videos uploaded by users can be evaluated automatically and objectively without using original video information, and accordingly the videos uploaded by the users can be conveniently classified by video websites and preferentially recommended on the websites. The quality evaluation method and device for the uploaded videos of the websites have high application value.

An apparatus and method for measuring a specific gravity (concentration) of a medium using an ultrasonic wave, which can measure a propagation velocity of the ultrasonic wave to recognize a change of density and temperature of the medium using the measured propagation velocity of the ultrasonic wave, and for measuring the specific gravity (concentration) of the medium using the recognized change of the density and temperature of the medium. In the apparatus, a controller performs a control operation for displaying at least one medium to be measured on a display unit such that a user can select the medium to be measured, measures a propagation velocity of the ultrasonic wave for the medium selected by the user, reads a conversion equation for a specific gravity (concentration) corresponding to the selected medium, and inputs a value of the measured propagation velocity of the ultrasonic wave into the conversion equation. The display unit displays the specific gravity (concentration) calculated automatically by the conversion equation for the specific gravity (concentration).

The present invention provides a video image dynamic water level information extraction method based on geographical space-time scenes. The method concretely comprises the following steps of (1) establishing a coordinate system; (2) measuring parameters; (3) establishing a conversion equation; (4) extracting the land-water intersection lines; (5) calculating a water level line elevation value; (6) outputting the water level dynamic information and carrying out the over-limit early warning alarm. According to the present invention, by carrying out the coordinate conversion of a two-dimensional image coordinate system and a three dimensional geographic coordinate system on the video images of the watercourses and the urban flood prevention flooding regions, a water level information extraction process based on the video images of the conventional watercourses and urban flood prevention flooding regions is realized, the insufficiency that the water level stations can not be set in the urban flood prevention flooding regions is made up to a certain extent, at the same time, the construction investment of the water level stations can be reduced to a certain extent. In addition, time interval scales are arranged on an imaging time shaft of a monitoring camera, and the dynamic water level change information of the appointed monitoring video stations is outputted, thereby monitoring the water level information of the video monitoring areas dynamically.

The invention provides an EMD (empirical mode decomposition)-based stress-strain reconstruction method and belongs to the technical field of structural health monitoring. The method is mainly based on the information of three aspects of measured data of a strain gauge, a structural model, and the position information of measurable points and immeasurable points. The method comprises the steps of decomposing the actual measurement structural response of the measurable points of a monitoring system or a sensor into a group of modal responses; obtaining the modal response relationship between the measureable points and the immeasurable key points by establishing a finite element model-based conversion equation to obtain a group of modal responses of the immeasurable points and reconstructing the structural responses of the immeasurable points by superposing the obtained modal responses. The method enables the strain gauge to be directly used for measurement of the stress-strain of the key points under the condition of no direct sensor measurement, and is high in accuracy and analysis speed.

The present invention discloses a circular cutter processing cutter-axis vector smoothing method based on an AB type five-axis CNC machine tool. The method comprises the following steps: establishing a relation equation between a circular cutter cutter-axis vector and a cutter spacing design vector; establishing a motion conversion equation between the circular cutter cutter-axis vector and the five-axis CNC machine tool revolving axles A and B; establishing a relation equation between the circular cutter cutter-spacing design vector and the five-axis CNC machine tool revolving axles A and B; determining the design variable, the target function and the constraint condition of the circular cutter processing cutter-axis vector smoothing, and establishing a circular cutter processing cutter-axis vector smoothing mathematical model based on the AB type five-axis CNC machine tool; and determining the solution method of the above cutter-axis vector smoothing mathematical model. The circular cutter processing cutter-axis vector smoothing method based on the AB type five-axis CNC machine tool can avoid the rapid changing of the machine tool revolving axles, allow the machine tool revolving axles to perform more stable and smooth motion, greatly reduce the angular velocity and the angular acceleration of the machine tool revolving axles so as to improve the processing quality and the processing efficiency of the curved surface and have a high practical application value.

An OFDM baseband signal that has undergone a synchronization carrier modulation or a differential carrier modulation is inputted to a complex signal converter for nonlinear distortion equalization so as to be converted according to the N-th order function conversion characteristics (N>1). Then, nonlinear distortion in the OFDM baseband signal is compensated for. At this time, the following is used as a conversion equation:

y(n)=x(n)+Σa_m(n)x^m(n)(m>1)

wherein the values of the input signal, the output signal and the coefficient for m-th order distortion equalization at time n are, respectively, x(n), y(n) and a_m(n).

The invention discloses a ship loader level detecting method based on a laser radar, and provides a method with high recognition precision and capable of being used in adverse weathers. A two-dimension laser radar is mounted on a two-axis scanning drive mechanism, a length value in a polar coordinate system utilizing a laser radar detection center as a pole is obtained by decoding real-time scanned data of the two-dimension laser radar, an angle value is obtained according to a division value acquired during detection, a measured value in the polar coordinate system is converted into a right-angle coordinate system by a conversion equation, images are subjected to smooth filtering by a gaussian filter, edge strength of the images is obtained by combination of a difference algorithm, Hough transform and wavelet transform, and then retaining the maximum point of local gradients according direction of the gradients; edge recognition is carried out; two-dimensional space point cloud is obtained by final matching according to a least square method; three-dimensional space point cloud is then obtained by advancing the two-dimension laser radar along a storage yard; and finally point cloud of discrete data is subjected to triangulation.

Methods of performing print engine calibration create a color space conversion equation for a scanner of a class of printing devices, print test patches on a sheet, and scan the test patches using a scanner of the printing device to produce a scanned RGB value for each test patch. Such methods convert each scanned RGB value to an XYZ pseudo space using the color space conversion equation to produce XYZ values. These methods compare the XYZ values to second XYZ values of white paper to generate DeltaE curves for each of the test patches relative to white paper. The DeltaE curves are interpolated to form an equivalent aim curve. After the equivalent aim curve is determined, the methods periodically calibrate the same or an additional printing device that is within the class of printing devices using the color space conversion equation to produce second XYZ values.

An image processing apparatus that can be applied to a wide range of general images and that is capable of improving shitsukan of materials depicted in an image by interactively adjusting multiple physical image characteristics of an image based on human latent sensations. Physical image-characteristic parameters are extracted from an input image. The image-characteristic parameters are processed using a first numerical conversion equation, and various low-order-sensitivity parameters quantifying general latent sensations are calculated. The low-order-sensitivity parameters are processed using a second numerical conversion equation, and high-order-sensitivity parameters quantifying shitsukan for different materials are calculated. An output image of which the shitsukan in the input image are improved by combining various types of image processing for changing the image characteristics so that the high-order-sensitivity parameters approach predetermined values is generated.

The invention provides a steering engine position information processing method and system. A steering engine speed ring sensor is directly connected onto a motor shaft and a test on a rotary speed ofthe motor is realized. An output shaft of the motor is connected with a steering sheet through a speed reducing mechanism and then the steering sheet is controlled. Before a steering engine is used each time, the steering sheet is aligned to a mechanical zero position and then the steering engine is electrified. After the steering engine is electrified, a speed ring encoder is used for acquiringan encoder code value n in a period I at a fixed period and converting to obtain a rotary speed of the motor in the current period; a deflection angle of the steering engine in the current period canbe obtained by combining a speed reducing ratio of a speed reducer through conversion, so that a current position of the steering engine is obtained and estimation on the position of the electric steering engine without a position sensor is realized; the steering engine does not need the position sensor and the estimation on the position of the electric steering engine can be realized through a conversion equation, so that the cost, volume and weight of the electric steering engine are reduced.

A control unit adjusts spacing between a head with a heater and a storage medium of a storage unit by controlling power of the heater. The control unit measures first values of touchdown heater power at a first temperature set as temperature condition. And the control unit estimates second values of the touchdown heater power at a temperature other than the first temperature set on the measurement of the first values, on basis of a conversion equation. And the control unit determines heater power setting values to adjust the spacing between the head and the storage medium, for each of the sub-areas, on the basis of the first values and the second values.

The invention discloses a multi-coordinate system fusion method based on coordinate fitting. Firstly, pairs of coordinate points of the same name in a map designated based on different coordinate systems are collected in advance; a mapping relationship between each coordinate system is dynamically established in a local area with a radius R as a unit by using a coordinate point of a designated first unknown coordinate system; the least square method is used to calculate the coordinate transformation coefficients of the corresponding local region, and the coordinate transformation equation of the local region is established. The coordinates of the designated first unknown coordinate system are brought into the conversion equation to obtain the conversion result, and the coordinate point conversion of the local region is realized. This method can effectively realize the conversion between different coordinate systems and lays a foundation for the map linkage function of data visualization system.

The invention discloses an urban panorama dynamic display system and method based on large-screen fusion projection, relates to the technical field of urban panorama dynamic display, and aims to solvethe problem that the display effect is poor when an existing method for displaying a three-dimensional image is applied to urban panorama display. Key points of the technical scheme are as follows: the system comprises a construction module used for constructing a three-dimensional model of a city, a splicing module used for splicing the projection images of the plurality of projectors into an integral projection image; a conversion module used for generating a conversion equation, a matching module used for generating a matching equation, a first conversion module used for generating a firstconversion equation, a second conversion module used for generating a second conversion equation, and a projection module used for obtaining vehicle feature points and carrying out pixel conversion calculation on an overall projection image. Projection on the display screen comprises real-time projection of vehicles in a city, city panorama dynamic display is achieved, the immersion feeling of viewers is improved, and the advantage of being good in city panorama display effect is achieved.

An inkjet image forming apparatus sets an initial ink temperature according to a dot area of a dot-sized pattern printed by the printer head, and calculates an ink temperature by applying the initial ink temperature to a temperature conversion equation. The inkjet image forming apparatus prevents a measurement error of the temperature sensor from valid data after the printing process is terminated, so that it can correctly measure the ink temperature of the printer head.

The invention discloses a grating ruler calibration method and device and a visual detection device. The grating ruler calibration method comprises the following steps that (1) image sampling is carried out on a calibration plate placed on a machine table; (2) a sampled image is read, and the image coordinates of a sought point in the image, the deflection angle of the image, the grating ruler coordinates of the image and the world coordinates of the point are stored; (3) the step (2) is repeated until all the sampled images are completely read; (4) the world coordinates of the centers of allthe images are calculated through a coordinate system conversion equation, the grating ruler coordinates of the corresponding images and the world coordinates and the angle of the image centers are stored, a transverse reference line is formed in the image centers of the sampled images in the same horizontal sampling area, and a longitudinal reference line is formed in the image centers of the sampled images in the same longitudinal sampling area; and (5) the world coordinates of a to-be-detected image are determined according to the transverse reference line and the longitudinal reference line. The grating ruler calibration method can solve the problems that an existing grating ruler calibration method is inconvenient to operate and inaccurate in calibration precision.

The invention discloses an anti-saturation model-free preset performance trajectory tracking control method for an autonomous surface vehicle, and belongs to the technical field of unmanned surface vehicle anti-interference control. The anti-saturation model-free preset performance trajectory tracking control method for the autonomous surface vehicle comprises the following steps: step 1, establishing an unmanned surface vehicle kinetic model considering external interference; 2, establishing a saturation function model; 3, designing an anti-saturation controller independent of the model information; and 4, verifying the stability and robustness of the unmanned ship control system. By designing the error conversion equation and the saturation function model, saturation tracking control can be achieved only by adjusting the preset performance parameters, the structure is simple, the number of design parameters is small, and good applicability is achieved in the engineering aspect.