33 results about "Multi-scale approaches" patented technology

Method for measuring the dissimilarity between a first and a second images, including the following steps: a) multiresolution decomposition of the first and the second images to obtain coefficients of the first and of the second images, each coefficient being function of a scale and a location in space; b) constitution of the patches for the first and the second images; c) evaluation of the dissimilarity between the probability density functions of patches having a given scale and belonging to the first image and of patches having the same scale and belonging to the second image, the dissimilarity being a partial measure of the dissimilarity between the first and the second images; and a method for measuring the dissimilarity between a first and second video sequences, the method following a similar multi-scale approach based on sparse intrascale / interscale / interchannel patches and additionally taking motion into account.

A multi-scale method to efficiently determine the fine-scale saturation arising from multi-phase flow in a subsurface reservoir is disclosed. The method includes providing a simulation model that includes a fine-scale grid defining a plurality of fine-scale cells, and a coarse-scale grid defining a plurality of coarse-scale cells that are aggregates of the fine-scale cells. The coarse-scale cells are partitioned into saturation regions responsive to velocity and / or saturation changes from the saturation front. A fine-scale saturation is determined for each region and the saturation regions are assembled to obtain a fine-scale saturation distribution. A visual display can be output responsive to the fine-scale saturation distribution.

The present invention presents a novel application of a wavelet-based multiscale method in a nanomachining process chemical mechanical planarization (CMP) of wafer fabrication. The invention involves identification of delamination defects of low-k dielectric layers by analyzing the nonstationary acoustic emission (AE) signal collected during copper damascene (Cu-low k) CMP processes. An offline strategy and a moving window-based strategy for online implementation of the wavelet monitoring approach are developed.

The invention discloses a blind deblurring image restoration method, and belongs to the field of image processing. According to the invention, an lq / l2 norm is utilized to serve as a regularization prior term, a multiscale method is adopted to gradually solve in an iterative mode from a coarse scale to a fine scale, high-frequency information of an estimated image is updated by using an l1 norm fidelity term when the model is solved according to a splitting method, an analytical solution is provided by adopting a closed threshold formula during restoration of a clear image, and the algorithm speed is improved. Meanwhile, a linear progressive increase weight parameter is proposed when a blurring kernel is updated, and the blurring kernel is gradually estimated from coarse to fine accordingto the multiscale method, so that the convergence of the blurring kernel is further improved, and the quality of the deblurred image is improved.

Disclosed is a method for measuring movement and / or deformation of a study part subjected to an external stress, the method implementing a color digital image acquisition device and image correlation unit. The method includes: acquisition (250) of a plurality of color digital images of the surface of the study part by way of the color digital image acquisition device during the application of an external stress on the study part, and processing (260) of the color digital images acquired in the step of acquisition of a plurality of color digital images so as to highlight contrasting details on variable scales.

The invention provides a fluid-solid coupling response calculation method for ceramic matrix composite. The fluid-solid coupling response calculation method comprises the steps: calculating a CMCs unit cell model loading and unloading stress-strain hysteresis curve through a multi-scale method; calculating an obtained loading and unloading hysteresis loop through a unit cell model, interpolating any loading and unloading hysteresis loop response, and using the response as an agent model for fluid-solid coupling solid domain dynamics calculation; on the fluid-solid coupling interface, calculating the fluid load through CFD, writing a program to read the fluid load and map the fluid load to the solid node, reading the displacement of the solid node and mapping the displacement to the fluid node, wherein the same time step length is adopted for the fluid domain and the solid domain. According to the fluid-solid coupling response calculation method, the calculation of the CMCs fluid-solidcoupling response is realized, and the variable stiffness and hysteresis behavior description under CMCs loading and unloading is simple and easy to realize; and the robustness of kinetic solution isgood, and divergence is not easy to occur.

The invention discloses a method for accurately calculating the actual width of a single pixel in a crack image. The method specifically comprises the following steps: preprocessing a shot picture byadopting a multi-scale Retinex method; correcting the image by using perspective transformation; according to the actual length of a standard rectangular mark block and the pixel length occupied in the corrected image, obtaining the actual length a represented by each pixel, wherein the product of the calculated crack width pixel value and a is the actual crack width value. According to the method, the standard rectangle is obtained by preprocessing the picture and correcting the image, and the actual crack width value is calculated by indirectly establishing the proportional relation betweenthe image coordinate system and the actual coordinate system, so that the technical problem that the distance between the camera and the bridge crack is difficult to measure accurately is solved.

The invention discloses a computer soft hardware system based on a variation multiscale method, belonging to the technical field of high-performance computers. The computer soft hardware system provides a behavior of describing a system bottom layer with a discrete model unit and a calculation mode of describing a stability condition observed by a large quantity of model unit group behaviors withvariation restraint aiming at the multiscale structure and the discrete essence of a complex system in the actual world, thereby saving a large amount of calculated amount compared with simple bottomlayer discrete simulation and outstandingly enhancing the calculation accuracy compared with single-level equalization simulation. Multilevel calculation hardware with the design directly reflects the calculation mode, adopts the interaction among a large quantity of simple processor calculation model units and acts on the variation restraint of the large quantity of simple processor calculation model units with complex general processor calculation, thereby outstandingly enhancing the resolving speed and the calculating scale of similar problems.

The invention relates to the field of damage prediction of a composite laminate, aiming at providing a multi-scale prediction method for progressive failure of a composite laminate under low-velocityimpact. The method comprises the following steps: establishing a low-velocity impact finite element model containing a punching hammer, a composite laminate and a support plate; establishing a multi-scale prediction method of composite materials based on micromechanics; solving stress, strain and damage of the composite laminate under s low-velocity impact load based on a multi-scale method; and calculating the low-velocity impact to further obtain the impact force, displacement, velocity and acceleration. A macroscopic progressive failure behavior is predicted from a microscopic point of view; and compared with a research method based on the macromechanics theory of a composite material, the invention considers the influence of the difference of mechanical properties of microscopic fibersand matrixes on the macromechanics properties of the composite laminate, and more essentially and more accurately predicts the progressive failure behavior of the composite laminate under the low-velocity impact load.

A multi-image automatic registration and fusion stitching method. Firstly, the out-of-order images are enhanced by the multi-scale Retinex method; then the phase correlation algorithm improved by logarithmic polar coordinate transformation is used to match the images, and the scaling, rotation and translation parameters are calculated. Estimate the overlapping area between images, and formulate the sorting rules according to the peak energy of the impulse function; then extract the feature points of the overlapping area to be registered through the SUFR algorithm, improve the random sampling consensus algorithm to accurately purify the matching point pairs, optimize the model parameters, and establish the transformation between images Matrix, sequentially splicing sequence images; finally, use NSCT transformation algorithm and formulate fusion strategy to further fuse the spliced ​​images, and output the fused spliced ​​image; The impact of high noise and uneven illumination on image registration and mosaic can help save the cost of imaging equipment and make accurate diagnosis for medical staff. It has a good application prospect in the field of auxiliary medical imaging.

A method and system for automatic detection and volumetric quantification of bone lesions in 3D medical images, such as 3D computed tomography (CT) volumes, is disclosed. Regions of interest corresponding to bone regions are detected in a 3D medical image. Bone lesions are detected in the regions of interest using a cascade of trained detectors. The cascade of trained detectors automatically detects lesion centers and then estimates lesion size in all three spatial axes. A hierarchical multi-scale approach is used to detect bone lesions using a cascade of detectors on multiple levels of a resolution pyramid of the 3D medical image.

The invention discloses a day-ahead planed multi-scale imminent generation scheduling closed-loop control method and relates to a generation scheduling closed-loop control method. At present, following up on plans strictly is required on a unit by generation scheduling closed-loop control, and regulating capacity of the unit is limited from a certain extent, and a mass of thermal power generating units are required to input and participate regulation to guarantee area whole control preferences. The generation scheduling closed-loop control method includes the following steps: 1), arranging a master control area module in a interconnection power network system; 2), connecting the master control area module with an automatic generation control module; 3), designedly following the tracks of a model unit, a plan band width model unit and a plan deviation priority model unit by the automatic generation control module. With the technical scheme, the unit is provided with different plan control models according to self needs, multi-scale approaching of a day-ahead plan of the unit is achieved. On the premise that whole control performances of a control area are guaranteed, smooth construction of the day-ahead plan of a generating unit is taken into account, and win-win of a unit plan, unit performances and area indicators is achieved.