101 results about "Local average" patented technology

A computer automated method that applies supervised pattern recognition to classify whether voxels in a medical image data set correspond to a tissue type of interest is described. The method comprises a user identifying examples of voxels which correspond to the tissue type of interest and examples of voxels which do not. Characterizing parameters, such as voxel value, local averages and local standard deviations of voxel value are then computed for the identified example voxels. From these characterizing parameters, one or more distinguishing parameters are identified. The distinguishing parameter are those parameters having values which depend on whether or not the voxel with which they are associated corresponds to the tissue type of interest. The distinguishing parameters are then computed for other voxels in the medical image data set, and these voxels are classified on the basis of the value of their distinguishing parameters. The approach allows tissue types which differ only slightly to be distinguished according to a user's wishes.

The invention provides a bivariate nonlocal average filtering de-noising method for an X-ray image. The method is characterized by comprising the following steps: 1) a selecting method of a fuzzy de-noising window; and 2) a bivariate fuzzy adaptive nonlocal average filtering algorithm. The method has the beneficial effects that in order to preferably remove the influence caused by the unknown quantum noise existing in an industrial X-ray scan image, the invention provides the bivariate nonlocal fuzzy adaptive non-linear average filtering de-noising method for the X-ray image, in the method, a quantum noise model which is hard to process is converted into a common white gaussian noise model, the size of a window of a filter is selected by virtue of fuzzy computation, and a relevant weight matrix enabling an error function to be minimum is searched. A particle swarm optimization filtering parameter is introduced in the method, so that the weight matrix can be locally rebuilt, the influence of the local relevancy on the sample data can be reduced, the algorithm convergence rate can be improved, and the de-noising speed and precision for the industrial X-ray scan image can be improved, so that the method is suitable for processing the X-ray scan image with an uncertain noise model.

An adaptive spatio-temporal filter for use in video quality of service instruments based on human vision system models has a pair of parallel, lowpass, spatio-temporal filters receiving a common video input signal. The outputs from the pair of lowpass spatio-temporal filters are differenced to produce the output of the adaptive spatio-temporal filter, with the bandwidths of the pair being such as to produce an overall bandpass response. A filter adaptation controller generates adaptive filter coefficients for each pixel processed based on a perceptual parameter, such as the local average luminance, contrast, etc., of either the input video signal or the output of one of the pair of lowpass spatio-temporal filters. Each of the pair of lowpass spatio-temporal filters has a temporal IIR filter in cascade with a 2-D spatial IIR filter, and each individual filter is composed of a common building block,5 i.e., a first order, unity DC gain, tunable lowpass filter having a topology suitable for IC implementation. At least two of the building blocks make up each filter with the overall adaptive spatio-temporal filter response having a linear portion and a non-linear portion, the linear portion being dominant at low luminance levels and the non-linear portion being consistent with enhanced perceived brightness as the luminance level increases.

A window size for outlier detection in a time series of a database system is determined. Strength values are calculated for data points using a set of window sizes, resulting at least in one set of strength values for each window size. The strength values increase as a distance between a value of a respective data point and a local mean value increases. For each set of strength values, a weighted sum is calculated based on the respective set of strength values. A weighting function is used to suppress the effect of largest strength values and a window size is selected based on the weighted sums.

An image processor includes a statistic-data acquiring section acquiring statistic data of a luminance value of a displayed image, the statistic-value acquiring section acquires, as the statistic data, a first index regarding a shadow pixel group and a second index regarding a highlight pixel group; a brightness index computing section computing a brightness index of the displayed image based on the statistic data, the brightness index computing section computing the brightness index from the first and the second indexes; a filtering section filtering luminance values of at least a part of a plurality of pixels included in a target pixel region of the displayed image to compute a local average luminance value; and a contrast correcting section performing contrast correction of the displayed image based on the brightness index and the local average luminance value.

The invention discloses a method for removing visual gaps among modules after a display screen is spliced and a display method, and belongs to the field of display screens. The method comprises the steps of S1, obtaining a brightness distribution picture when the display screen is lightened; S2, determining the positions and gap positions of all light points on the brightness distribution picture;S3, calculating to obtain brightness compensation coefficients of the light points at the two sides of each gap and inside each module or all the light points according to the local average brightness difference of the gaps or the non-gaps, or according to the distance of adjacent light points at the two sides of each gap and the distance difference of adjacent light points inside each module; S4, using the brightness compensation coefficients to adjust the brightness of the light points at the two sides of each gap and inside each module or all the light points to visually remove the visualgaps among the modules after the display screen is spliced. Bright and dark lines in gaps among display units of the spliced display screen are visually removed, the visual effect is obviously improved, the achievement steps are simple, and the splicing and installation difficulty and installation cost are lowered.

The invention relates to an improved region growing method which is applied to vessel segmentation and extraction in a coronary artery angiography image. The improved region growing method comprises the following steps of: preprocessing the image to obtain an original image capable of directly performing region growth; making a regulation and randomly generating a group of seed points; setting a stack data structure, enabling a newly grown pixel point to enter a stack, and taking out the point previously entering the stack to serve as a current point to be subjected to growth when the current point completes the growth; sequentially performing growth on each seed point, wherein a seed point gray value serves as an average value at a growing initial stage, and calculating a new average gray value when a new pixel point is grown every time along with the growth of the seed points; and completing the growth when no pixel point meeting growth standards exists and no seed point exists. The improved region growing method has the advantages that the seed points are automatically generated, no manual intervention is needed, the local average values around each pixel point serve as growth parameters in a growing process, the coronary artery angiography image with uneven brightness can be segmented, and the efficiency and the accuracy of the image segmentation are improved.

CT imaging is enhanced by adaptively filtering x-ray attenuation data prior to image reconstruction. Detected x-ray projection data are adaptively and anisotropically filtered based on the locally estimated orientation of structures within the projection data from an object being imaged at a plurality of rotation positions. The detected x-ray data are uniformly low pass filtered to preserve the local mean values in the data, while the high pass filtering is controlled based on the estimated orientations. The resulting filtered data provide projection data with smoothing along the structures while maintaining sharpness along edges. Image noise and noise induced streak artifacts are reduced without increased blurring along edges in the reconstructed images. The enhanced image allows reduced x-ray dose while maintaining image quality.

The invention discloses a deep learning human face identification method based on weighting L2 extraction. According to the method, firstly, the human face feature vector is extracted through various-convolution-kernel convolution, then, a weighting L2 extraction method is utilized for carrying out dimensionality reduction on the feature vector, and then, a local average normalizing processing method is adopted for normalizing the feature vector, so a layer of network in the deep learning is formed, the same method is used for building three layers of deep leaning networks, in addition, the three layers of deep learning networks are subjected to cascade connection for forming a layered three-layer deep learning network, and finally, a support vector machine classifier is utilized for carrying out human face training and identification. The deep learning human face identification method has the advantages that the weighting L2 extraction method is provided for realizing the feature dimensionality reduction, the over fitting problem in the training and the single feature problem in the traditional L2 extraction are solved, the feature vector dimensionality reduction is effectively realized, meanwhile, the human face identification performance can be improved, higher grade of features can be effectively extracted, the stability is high, and the identification performance is high.

The invention provides a speech emotion recognition method based on manifold. The speech emotion recognition method based on the manifold comprises the following steps that the phonetic features of a test statement are extracted, wherein the phonetic features comprise MFCC, LPCC, LFPC, ZCPA, PLP and RASTA-PLP; the local average value and the variance of each extracted phonetic feature are calculated, the local average value and the variance of the first difference of each extracted phonetic feature are calculated, the local average values and the variances are connected in series, and therefore local statistical features of the test statement are formed; a universal background model (UBM) and the local statistical features of the test statement are applied so that a specific Gaussian mixture model (GMM) of the test statement can be generated, then, all average values of the GMM are connected into a vector, and the vector serves as a feature vector of the test statement; according to the features selected according to the integrated feature selection algorithm and the multi-cluster feature selection algorithm (MCFS), the feature vector of the test statement is changed; a support vector machine classification model is applied, the feature vector, existing after feature selection, of the test statement serves as input, and emotion classes of the statement are tested in a classified mode. The degree of accuracy of speech emotion recognition of the speech emotion recognition method based on the manifold is high.

The invention provides an exposure method and apparatus. The method comprises the following steps: obtaining a global picture; calculating the global average gray value of the global picture; determining whether the global average gray value meets a preset global target gray scale condition or not; when the global average gray value does not meet the preset global target gray scale condition, adjusting the exposure magnitude of the camera; when the global average gray value meets the preset global target gray scale condition, detecting the object in the global picture and obtaining the local picture with the object; calculating the local average gray value of the local picture; determining whether the local average gray value meets a preset local target gray scale condition or not; and when the local average gray value does not meet the preset local target gray scale condition, adjusting the exposure magnitude of the camera. According to the invention, the self-adaptive exposure of a global picture and the self-adaptive exposure of a local object are integrated for use in a mutually assisting manner, which maximally satisfies the lighting condition for imaging required by the human face of a target object.

The present invention discloses a generation method of three-dimensional local average random field samples of geotechnical parameters. The generation method comprises the steps: (1) regarding geotechnical parameters as a three-dimensional continuous and stationary random field, and performing random field mesh discretization and unit numbering; (2) determining a local average random field covariance; (3) determining a lower triangular matrix L according to an assembled overall random field covariance matrix; (4) constructing a random vector beta; (5) determining a random vector alpha; (6) generating a set of local average random field samples; and (7) generating multiple sets of local average random field samples. In this method, a tetrahedral random field mesh and a tetrahedral finite element mesh may be the same mesh; the obtained local average random field samples can be directly applied to random finite element calculation; the correspondence of unit numbers is clear; the calculation is accurate; programming is easy; the universality is high; and the method can be widely applied to discretization analysis of the random finite element parameter random field.

The invention provides a multi-modality image fusion method based on a region and human eye contrast sensitivity characteristic, comprising the following steps of: (1) respectively utilizing a non-subsampled Contourlet transform NSCT to carry out multi-scale decomposition on a source image to be fused to obtain each stage of sub-band coefficient of the source image; (2) respectively formulating a fusion rule of a low-frequency sub-band coefficient and each stage of high-frequency sub-band coefficient according to a human eye vision contrast function LCSF, a human eye vision absolute contrast sensitivity function ACSF, a feeling brightness contrast function FBCS and a local average gradient sensitivity function LGSF to obtain each grade of the sub-band coefficient of a fused image; and (3) carrying out NSCT inverted conversion on the fused coefficient and reconstructing to obtain the fused image. The multi-modality image fusion method disclosed by the invention meets vision properties of a human eye and improves the quality of the fused image to a great extent; and the multi-modality image fusion method has robustness, is suitable for fusing a plurality of types of image sources of infrared and visible light images, multi-focusing images, remote images and the like, and has a wide application prospect.

An adjusting technology of thermal processing is provided. A heating lamp and a reflector are disposed over a wafer and the heat flux distribution on the wafer generated by the individual heating lamp is measured and adjusted. A set of heating lamps formed by heating lamps is disposed over the wafer. The heating lamps are in concentric rings and arranged as an axi-symmetric array. The relative position between the set of heating lamps and the wafer is adjusted so that the wafer center is at the position with local mean heat flux from lamps between the most inner lamp subset and its adjacent lamp subset. Followed by adjusting the heating powers, either or both of the wafer and the set of heating lamps are rotated respect to the center of the wafer, so as to improve uniformity of the heat flux distribution on the heated object.

Utilization of non-printing high-spatial-frequency auxiliary pixels are introduced into the bitmap of halftones utilized in an image to obtain local control of the image development by modification of local average voltage in the development nip. These auxiliary pixels embody frequencies or levels of charge that are past the threshold for printing on the Modulation Transfer Function (MTF) curve, and therefore by themselves result in no toner deposition on the resultant page. These auxiliary pixels will however, position the toner cloud by modulating it and compensate for cleaning field and toner supply effects. This will better position the toner cloud to ensure adequate toner supply to all parts of the image so that the desired printing pixels will print as intended and provide a more faithful rendering of grayscale information in the image.

The invention discloses a video transcoding method and device, and belongs to the technical field of the computer. The method comprises the following steps: acquiring a video data packet of a de-encapsulated target video; periodically computing the overall average code rate of the target video and the local average code rate in the preset period; adjusting the coding rate according to the overallaverage code rate and the local average code rate; and performing transcoding processing on the target video based on the adjusted coding rate. By using the method and device disclosed by the invention, the basic consistency of the code rate of the output video and the code rate of the input video can be furthest guaranteed, and the video transcoding effect can be improved.

A data processing method for detecting a watermark codeword in a received image signal representing a watermarked image is described. The watermarked image comprises a plurality of signal samples each of which represents a pixel value of the image, to which a watermark codeword coefficient value has been added. The method comprises the steps of low pass filtering the received image signal to generate, for each signal sample, a local mean value, subtracting the local mean from the received image signal to generate a residual signal comprising, for each signal sample, a residual value, and determining, from the residual signal, a local standard deviation for each signal sample. The method also comprises the step of generating, for each signal sample, a watermark strength value providing an estimate of the magnitude with which the watermark codeword coefficient has been added to the received image signal sample. The method also comprises the steps of generating, for each signal sample, a first gaussian likelihood function describing the likelihood of the watermark codeword coefficient embedded into the signal sample being positive, the first gaussian likelihood function having a mean defined by the sum of the local mean value and the watermark strength value and a standard deviation defined by the local standard deviation and generating, for each signal sample, a second gaussian likelihood function describing the likelihood of the watermark codeword coefficient embedded into the signal sample being negative, the second gaussian likelihood function having a mean defined by the difference between the local mean value and the watermark strength value and a standard deviation defined by the local standard deviation. When the above likelihood functions have been generated, the method can detect a watermark in the received watermark image based on the probability of the watermark codeword coefficients added to each signal sample being one of positive or negative, the probability being calculated from the first and second likelihood functions. This provides an estimate of the positioning of the watermark within the received watermark image.

An antenna device and a portable wireless communication apparatus are disclosed to securely lower a local average SAR in correspondence to at least two or more kinds of radio communication systems using different radio communication frequencies even when any radio communication frequency is used. The present invention makes it possible to bring input impedance at open ends of conductive planar plates 11A and 11B close to infinity at first and second radio communication frequencies and restrict emission of electromagnetic waves by restricting a high-frequency current to be supplied to the above described conductive plates 11A, 11B and a shield case 2, thereby securely lowering the local average SAR in correspondence to at least two or more kinds of radio communication systems using different radio communication frequencies even when any radio communication frequency is used.

The present invention relates to an apparatus and method of frame synchronization in broad band wireless communication systems. In an apparatus of frame synchronization in a mobile station, a time variant phase rotation compensator eliminates time variant phase rotation carried in received signals by conjugated multiplication between adjacent signal samples. Then, the processed signal is fed into a delay correlator to calculate a plurality of correlations between two successive frames. A local power calculator acquires an average power of several symbols centered on delayed correlation values. A normalizer normalizes the delayed correlation values with a local average power corresponding to the delayed correlation values. A maximum value detector selects the maximum value from normalized correlation values to trigger frame synchronizing and timing signals.