51results about How to "Keep edge information" patented technology

The invention provides a method to eliminate noise, comprising the following steps: to compare a central pixel point and a neighborhood middle pixel point; to determine whether the central pixel point is a noise point based on the comparison result; if the central pixel point is a noise point, to replace the pixel value of the central pixel point with a weighted average of the pixel value of the neighborhood middle pixel point; if not, to replace the pixel value of the central pixel point with a weighted average between the pixel value of the neighborhood middle pixel point and the pixel value of the central pixel point. The method effectively eliminates the noise and well maintains the image edge information.

The invention belongs to the technical field of depth image inpainting, and particularly relates to a Kinect depth image inpainting method based on improved trilateral filtering for kinect depth images. The method comprises the steps that depth images and color images are synchronously acquired by utilizing Kinect; the color images and the depth images are aligned; edge information of the depth images is extracted; edge information of the color images is extracted; non-boundary texture information in the color images is removed; pixel points of which the depth values are incorrect are found in the depth images by using a region growing method and the incorrect depth values of the points are removed; and filling inpainting is performed on the hole areas of the depth images by using the improved trilateral filtering method based on aberration and structural similarity coefficient. The method has great hole filling effect for the kinect depth images so that the edge information of the depth images can be greatly maintained.

The invention discloses a low-illumination image enhancement method and system, and belongs to the technical field of image processing. The method comprises the steps of converting an input original image into an HIS space from an RGB space, keeping the saturability and the hue component of the image unchanged, enhancing the brightness component, converting the image with the brightness enhanced into the RGB space from the HIS space and outputting the image. According to the low-illumination image enhancement method and system, the image brightness is improved, extremely-dark areas (the areas close to black) are prevented from being changed into bright-colored areas after being enhanced, and the image adapts to the human visual characteristics better. Meanwhile, the complexity is low, the calculation amount is small, high-definition images can be processed in real time, and the performance requirement for hardware can be lowered.

The invention discloses a fundus image blood vessel segmentation method based on phase congruency and mainly overcomes the defect that a traditional method can not be used to accurately segment blood vessels in fundus images. The fundus image vascular segmentation method base on the phase congruency can be simultaneously used to segment small blood vessels of most tips. The method comprises the steps: (1) extracting green channels of the fundus images, (2) enhancing the contrast ratio of the images through contrast limited adaptive histogram equalization (CLAHE), (3) filtering the fundus images through the anisotropic coupled diffusion equation, (4) segmenting the blood vessels of the fundus images filtered or not filtered through the anisotropic coupled diffusion equation in a phase congruency algorithm, (5) multiplying pixel-levels of results of vessels, of two fundus images, segmented based on the phase congruency algorithm, (6) processing the images in a binaryzation mode through the iterative threshold segmentation method, (7) optimizing the images in the mathematical morphology method. The fundus image vascular segmentation method has significant application values in fields of three-dimensional splicing of the fundus images and judging existence of diabetes mellitus and severity of diabetes mellitus.

The invention belongs to the analysis field of quantitative metallography on all-form crystal grains in a steel material microstructure and particularly relates to an automatic measurement and fine classification method for steel crystal grains, and a system thereof. According to the method, an image acquisition device acquires the original images of to-be-measured crystal grains of the steel material firstly, and then the original images are pre-processed by an image pre-processing module. The pre-processed images are subjected to the region labeling treatment by an automatic measurement module, and then the images of to-be-measured crystal grains can be obtained. After that, the geometry characteristic parameters of the images of to-be-measured crystal grains are extracted, and then the characteristic morphological parameters of target crystal grains are measured through the random field area algorithm. The area of crystal grains is obtained, and then the grain size of crystal grains and the mixed crystal degree (GME) of crystal grains can be figured out. The mixed crystal degree (GME) of crystal grains is automatically classified by an automatic classification module according to a most suitable threshold. In this way, the blank in measuring and classifying the mixed crystal degree of steel crystal grains in the prior art can be filled up. Meanwhile, the characterization precision of the images of steel crystal grains is up to plus/minus 0.001 [mu]m. Therefore, by adopting the above method and the above system, the characterization precision of the images of steel crystal grains is highest during the steel metallographic structure analysis process.

The invention discloses a textural feature and color feature fusion-based image saliency detection method, and mainly aims at solving the problem that the textural feature utilization is insufficient and the high-texture image saliency detection result is relatively bad in the prior art. The scheme is that the method comprises the following steps of: 1) inputting an image and removing textures of the image by utilizing a total variation model-based filtering method so as to obtain an image with color textures; 2) filtering the input image by utilizing a Garbor filter so as to obtain an image with image texture information; 3) calculating a preliminary contrast value according to the image with the color features; 4) calculating a background probability according to the image with the texture information; and 5) fusing the preliminary contrast value and the background probability to obtain a new contrast and then obtaining a saliency map on the basis of color and texture features. According to the method disclosed by the invention, the color and texture information of the image is sufficiently utilized, so that the complicated-texture image detection effect is improved; and the method can be applied to computer vision tasks.

The invention discloses a weighted synthetic kernel and TMF based polarimetric SAR image classification method and relates to polarimetric SAR image classification. The method comprises the steps of step 1, selecting polarimetric SAR image polarization characteristics and training samples, and building characteristic space; step 2, establishing the weighted synthetic kernel; step 3, achieving initial classification by the combination of the weighted synthetic kernel and a support vector machine to be used as an initial value of a marking field X; step 4, estimating a novel marking field X and a novel auxiliary field U; step 5, using the marking field X as the final polarimetric SAR image classification result till the marking field X converges. According to the method, the problems that the initial classification accuracy is not high, and the Markove field cannot process polarimetric SAR image unsteady characteristics of the prior method are mainly solved. Homogeneous region classification results are smooth, marginal information can be kept well, the classification accuracy is improved apparently, and the method can be used for target detection and recognition of polarimetric SAR images.

The invention discloses a bidirectional iteration bilateral filtering method for asphalt images obtained through an UAV-borne infrared imaging device. The method includes a first step of taking original infrared asphalt images by utilizing an unmanned aerial vehicle (UAV), a second step of switching original infrared asphalt images in RGB color space to a Lab color space, a third step of expanding the image boundaries by using the boundary pixels of the infrared asphalt images in the Lab color space obtained in the second step, a forth step of conducting lateral filtering on the images obtained in the third step, a fifth step of conducting vertical filtering on the images obtained in the fourth step, and a sixth step of switching images in the Lab color space processed in the step 5 to the RGB color space and outputting filtered infrared asphalt images. Lateral and vertical bi-directional iteration bilateral filtering means is employed, infrared asphalt image noises can be rapidly eliminated, and the edge detail can be retained. The infrared asphalt image filtering effect is satisfactory, and edge information of images can be retained.

The invention belongs to the field of digital image processing, and in particular discloses a scene motion blurred image restoration method in the presence of a moving object. The method comprises the following steps of: 1, estimating and amending parameters of a motion model of a scene motion blurred image and extracting a moving object blurred image; 2, restoring the motion blurred image: including restoring the scene motion blurred image and restoring the moving object blurred image, wherein the parameters of the motion model of static scene motion blur are estimated by the method in the step 1 and are amended and then the image is restored by using an image restoration method for the scene motion burred image; and 3, fusing restored images: embedding the moving object image restored by the step 2 into the restored scene image, namely fusing the restored moving object image and the restored scene image, and processing the joint part of the restored moving object image and the restored scene image by using a filtering method to enable a joint of the images to be smooth so as to keep integrity of the image.

The invention discloses a hyperspectral image denoising method based on non-convex low-rank matrix approximation and total variation regularization. The hyperspectral image denoising method comprisesthe following steps: 1) acquiring hyperspectral image data to be denoised, wherein M, N and K represent the number of width and height spectral bands of a hyperspectral image respectively; 2) constructing a denoising model based on non-convex low-rank matrix decomposition and TV regularization; (3) optimizing the model by adopting an Augmented Lagrange function (ALM) algorithm, and optimizing themodel by adopting an ALM algorithm; 4) optimizing and solving the model by adopting an augmented Lagrange function algorithm; and 5) outputting the hyperspectral image after the mixed noise is removed.

The invention belongs to the field of machine vision, and particularly relates to a 3D scene flow estimation method based on the self-adaptive non-local smoothing method. The method comprises the steps of according to the corresponding relation between stereoscopic image sequences acquired by a binocular camera, combining the local constraint method with the global smoothing method and introducing the self-adaptive non-local smoothing method; in reference to a Lucas model, designing scene flow data items for the local neighborhood constrains; adopting the robust function as a smooth item to construct a total variation smoothing approximate to an L1 norm; and solving out an energy function in the de-antithesis manner. According to the technical scheme of the invention, noise-induced heterogeneous points in an image sequence can be effectively removed, and the edge information of the motion field can be maintained. Meanwhile, the information can be effectively transmitted to a low-texture region.

A hyperspectral image denoising method based on multichannel truncated nuclear norm and total variation regularization comprises the following steps: 1) obtaining a hyperspectral data image to be denoised, N being additive white Gaussian noise (AWGN), X being a recovered clean image, m and n being the length and width of the spatial dimension of the hyperspectral image respectively, and p being the number of spectral bands; 2) constructing a multi-channel truncated nuclear norm and total variation regularization hyperspectral image denoising model; (3) optimizing the model by adopting Alternating Direction Method of Multipliers (ADMM); and 4) outputting the denoised hyperspectral image. The method has the advantages that the piecewise smooth prior is better reserved, the edge information is effectively kept, and the denoising effect of Gaussian noise is enhanced at the same time.

The present invention discloses a high-efficient image denoising algorithm and a hardware realization apparatus of the algorithm. The technical scheme comprises the steps of carrying out a gradient pre-detection of a central point of a (3*3) matrix, determining whether the noise is salt-and-pepper noise by the gradient, carrying out fast median filtering if the noise is the salt-and-pepper noise and carrying out orientation average filtering to filter Gauss noise if the noise is not the salt-and-pepper noise, and directly outputting non-noise points. The technical scheme can obtain an effect exceeding the effect of only carrying out median filtering or only carrying out average filtering under the hardware realization cost of being in need of only four rows of row cache, and has a better retentivity of image edges, and has flexible selectivity in filtering mode.

An embodiment of the invention discloses a blind element compensation method for an infrared or terahertz image. The blind element compensation method comprises the steps of selecting X normal row image elements in a row on which the blind element is arranged; constructing a Newton interpolation function according to the X normal row image elements and calculating a row interpolation value of the blind element; selecting X normal line image elements from a line on which the blind element is arranged; constructing a Newton interpolation function according to the X normal line image elements and calculating a line interpolation value of the blind element; and calculating the gray level of the blind element according to the row interpolation value and the line interpolation value. The gray level which is compensated according to the blind element compensation method provided by the embodiment of the invention further approaches a real value and has a smaller error. Furthermore the blind element compensation method can better keep the edge information and the detail information of a target image and furthermore has higher image quality.

The invention provides a real-time monitoring video adaptive filtering method and a real-time monitoring video adaptive filtering system. The real-time monitoring video adaptive filtering method comprises the following steps of performing block matching on a current video image f (x, y); constructing three-dimensional data groups of various similar blocks; performing wavelet transformation on the three-dimensional data groups; and respectively performing adaptive de-noising processing on a high-frequency coefficient and a low-frequency coefficient by using a soft and hard threshold value on the basis of noise variance iteration to obtain a de-noised image f1 (x, y). Video signals are recovered and processed, and influences of complex interference such as gauss and pulse noises are overcome; and marginal information of video images can be maintained, and the de-noising effect is high.

The present invention provides a belly image reconstruction device. The device is reconstructed in the free breathing, a Golden-Angle Radial 3D rapid scanning sequence is employed to obtain a liver image. The locally linear embedding (LLE) in the manifold learning method is employed to perform the dimension reduction process of the K space center data, and a respiratory curve is obtained; the data packet is performed according to the respiratory curve, and each group of data is subjected to reconstruction through adoption of a multi-scale low-order recovery theory; and finally, each group of reconstructed data is subjected to registering so as to eliminate the motion artifact and obtain a final image. The belly image reconstruction device does not reject any data with no need for an operator's manual participation, and is high in degree of automation and low in application cost, etc.

The invention discloses an automatic SAR image segmentation method based on graph division particle swarm optimization and mainly solves a problem of poor image segmentation effect in the prior art. The method comprises steps that 1, an original to-be-segmented image is inputted, and the gray information is read; 2, the to-be-segmented image is filtered to acquire a gradient image; 3, the gradient image is divided into non-overlapped regions; 4, the largest class quantity of the gradient image is solved and is taken as the largest image gray level; 5, the segmented regions are mapped to be undirected weighted graphs, and an energy function of the undirected weighted graphs is constructed; 6, iteration solution of the energy function is carried out to acquire a class center and the class quantity; and 7, whether iteration frequency is smaller than 20 is determined, if yes, particle update continues, if not, the optimal class quantity and the images after segmentation are outputted. The method is advantaged in that the operation speed is fast, the segmentation effect is good, and the method can be applied to medical images, satellite image positioning, face identification, fingerprint identification, traffic control systems and machine vision.

The invention belongs to the technical field of edema region boundary extraction, and discloses an OCT image edema region boundary extraction method and system based on biological inspiration, and themethod comprises the steps: carrying out the denoising and smooth preprocessing of an OCT image based on biological inspiration; and carrying out edema region boundary extraction on the OCT image byutilizing the improved SBGFRLS model. According to the method, denoising and smoothing preprocessing of the OCT image are realized based on a structure preserving and guiding retina image filtering method; according to the SGRIF method, the image quality is improved, meanwhile, the structure of the retina image is protected, and a foundation is laid for high-precision extraction of the edema region boundary; based on edema region boundary extraction of the improved level set, the level set evolution curve is converged into the edema region by improving the symbolic pressure function in the binarized Gaussian filtering level set, and high-precision extraction of the edema region boundary of the DME is achieved.

The invention discloses a method for extracting a container loading bridge based on a remote sensing interpretation analysis technology. The method comprises the steps of: firstly, constructing a background model by using LBP texture gray scale invariance; secondly, dividing an image into a plurality of non-overlapping regions according to different characteristics on an initial target model; thirdly, performing topologization and extraction on a remote sensing image, and conducting normalization processing to obtain a shape template; and finally, performing compensation on the shape templateaccording to texture characteristics to identify the container loading bridge. The method is based on fuzzy selection and carries out digitization at the same time, edge information can be maintainedduring the digitization process, the subsequent processing is facilitated, the remote sensing image is divided into the plurality of parts through image segmentation in the processing process, the remote sensing image can be coordinated through normalization processing after compensation of the shape template and the texture characteristics, tremendous amount of computing can be avoided, and the data processing efficiency and identification accuracy rate can be improved.

The invention discloses a human body animation synthesis method based on a human body soft tissue grid model, and the method comprises the steps: firstly extracting the features of different dimensions of an image through a feature pyramid network, and then inputting the features of different dimensions into subsequent tasks such as human body part segmentation, soft tissue texture and posture estimation through a region-feature alignment technology.; and according to the three-dimensional posture and the soft tissue texture, mapping the figure in the original image to a three-dimensional human body soft tissue grid model to achieve reconstruction of the human body soft tissue grid model, and then achieved human body animation synthesis through redirection of the human body soft tissue grid model. By using the method of combining the human body soft tissue mesh model and the deep learning, the human body soft tissue motion can be accurately captured, so that the synthesized human bodyanimation details are richer in expression.

The invention discloses an edge information considering half-toning method and system of a multi-level error diffusion image, and belongs to the technical field of hard copying and output of digital images. The method comprises that an input image is decomposed nonlinearly, half-toning is carried out on each decomposition image in an edge information considering multi-dimensional error diffusion half-toning method, multiple binary half-toning images are obtained, and a multi-level half-toning image is obtained by merging the binary half-toning images. Via the method, the problem that an errordiffusion half-toning method tends to cause regular texture can be solved effectively, the hierarchy of the half-toning image is kept consistent with that of the input image, edge structure information of the input image can be maintained, and the multi-level half-toning image obtained by the method can be directly applied to a multi-bit printer for printing and outputting.