85 results about "Spherical model" patented technology

The invention provides an unfolding method for restoration of a fisheye image, and relates to the restoration and correction of a fisheye image based on the equidistant projection principle of a spherical model. The method comprises the following steps of: establishing a spherical imaging model, consistent with the equidistant projection principle, of the fisheye image(including the establishment of a fisheye image coordinate system and a camera coordinate system); establishing an unfolded window coordinate system and an unfolded image coordinate system, and calculating the relationship between the two coordinate systems; establishing the relationship between the unfolded image coordinate system and the camera coordinate system; calculating the relationship between the unfolded image coordinate system and the fisheye image coordinate system; and finally obtaining a whole image unfolded in any specified direction. The method can overcome the defect of the methods that can unfold only the top part information of fisheye lenses and can not only restore the top part information, but also restore all information in any direction, The method can be applied to the equidistant projection principle based fisheye lenses as well as other projection principle based fisheye lenses, so that the method has a wide application prospect in fields of image tracking, monitoring, video conference and the like.

The invention discloses a fisheye calibration method and a device, which can be used for calibrating most of camera lenses, and are accurate in calibration result, simple in operation and high in efficiency. The technical scheme is that the method comprises the following steps of: establishing a half-unit spherical model, and establishing a fisheye imaging relationship on a unit spherical model; initializing internal parameters, wherein the internal parameters are parameters of a fisheye camera and have nothing to do with the external environment; calculating a homography matrix; initializingexternal parameters, wherein the external parameters are parameters between the fisheye camera and the external environment; and performing Levenberg-Marqardt (LM) iteration to minimize re-projectionerrors so as to obtain optimized internal parameters and external parameters.

The invention relates to the technical field of image display, and discloses a 360-degree panorama display method and display module, and a mobile terminal. The 360-degree panorama display method comprises the following steps: obtaining a current vision point; according to the current vision point, establishing a spherical model within a current visual angle scope; performing rendering on the spherical model within the current visual angle scope so as to generate a three-dimensional image in the visual angle scope; and displaying the three-dimensional image in the visual angle scope. The 360-degree panorama display method and display module, and the mobile terminal, provided by the invention can reduce the program computational complexity and improve the rendering efficiency in the 360-degree panorama display process of the mobile terminal.

The invention discloses a method and a device for transcoding a panoramic video. The method comprises steps: a first panoramic video frame image is acquired, wherein the first panoramic video frame image is a frame of image in a panoramic video in a spherical model; the first panoramic video frame image is mapped to the surface of a preset cube model and mapping images mapped to the surface of the cube model are combined into a second panoramic video frame image, wherein the central point of the cube model is coincident with the spherical center of the sphere model; and all second panoramic video frame images are combined according to a preset sequence and coded into a cube model panoramic video. The method transcodes the first panoramic video frame image in the sphere model into the second panoramic video frame image in the cube model, and in a condition with the same bandwidth, the second panoramic video frame image with a higher resolution can be propagated; and the second panoramic video frame image can be transmitted with a small bandwidth, and thus, the bandwidth resource utilization rate is improved.

The invention belongs to the technical field of photoelectric product application, and particularly relates to a fisheye image correction method based on a spherical model. The method comprises the steps that firstly, deformation parameters are acquired through spherical perspective projection constraints; secondly, plane coordinates are converted into spherical coordinates; thirdly, the spherical coordinates are expressed through latitude-longitude projection to obtain a corrected result map. An image corrected through the method is free of information leakage, and the algorithm is fast and accurate and can meet requirements of a system.

The embodiment of the invention provides a method and a device for measuring the particle size of soot particles. The method mainly comprises: building a scattering matrix of the scattered light of the soot particles according to the direct current component and harmonic wave component of the scattered light of the soot particle; and constructing a target function of the particle size parameter of the soot particles according to the scattering matrix, working out the optimal value of the target function by using the scattering matrix and the target function and by an inversion algorithm, and obtaining the particle size distribution of the soot particles according to the optimal value. According to the embodiment of the invention, the particle size inversion under a spherical model of the light scattering of soot particles in a fire disaster and the like by starting from a Mueller matrix which completely reflects the light scattering character of the particles, and thus, the particle size distribution of soot particles in a dire disaster and the like can be measured effectively.

The embodiment of the invention provides a panoramic video regulation method and device. The video playing method and device allow the video to play more flexible and be more abundant in function. The method comprises: binding the panoramic image frame of the panoramic video with a spherical model, and generating an output video frame; receiving a regulation instruction, converting the regulation instruction to the model regulation information corresponding to the spherical model; and regulating the output video frame according to the model regulation information, and generating a regulated output video frame. The video playing method and device perform corresponding regulation and displaying of the panoramic film source through the user's regulation operation so as to allow the panoramic video to play more flexible and enrich the play functions of the panoramic video.

The invention discloses a motor matrix control method and wearable equipment. The method comprises the following steps: on the basis of a three-dimensional spherical model, installing a plurality of linear motors to form a linear motor matrix and determining directions of all the linear motors of the linear motor matrix on the three-dimensional spherical model; carrying out information extraction on a received three-dimensional audio signal and acquiring the direction, frequency and amplitude information of the three-dimensional audio signal after reaching a center position of the three-dimensional spherical model; and generating a motor driving signal according to the direction, frequency and amplitude information of the three-dimensional audio signal after reaching the center position of the three-dimensional spherical model, and driving linear motors, a certain distance away from the direction of the three-dimensional audio signal, in the linear motor matrix to vibrate. With the adoption of the technical scheme provided by the invention, by inputting the direction, amplitude and frequency components in the three-dimensional sound to the tactile feedback three-dimensional matrix motor, and the real sense experience is enhanced from the touch sense, so that seamless coordination of the sound and tactile feedback is realized and the immersive experience of virtual reality is better.

Provided is a method for playing a panoramic video, applied to terminal equipment. The terminal equipment comprises a display screen. The method comprises: displaying a panoramic video under a navigation mode; calculating two-dimensional displacement information generated in a movement process of a touch operation executed on the display screen; calculating a rotation angle of a pre-established spherical model according to the two-dimensional displacement information; and changing an angle of view of a panoramic video picture according to the rotation angle. The present invention also provides a system for playing a panoramic video, and terminal equipment. In the present invention, playing of a panoramic video can be accurately controlled by a finger, the terminal equipment does not need to be shaken when playing of the panoramic video is controlled, and therefore a user does not need to adjust a viewing direction, thus bringing a better viewing experience.

The invention provides a reservoir production real-time optimization method based on an improved random disturbance approximation algorithm and belongs to the field of reservoir numerical simulation and optimal control. The method includes (1) giving initial control variables, boundary constraint and economic parameters; (2) supposing an iterative number k = 0, and performing numerical simulation computation to acquire a current NPV value; (3) generating Gauss type perturbation vectors according to spherical model covariance arrays, and computing the random disturbance gradients and an average value thereof; (4) updating the control variables; (5) performing reservoir simulation computation according to the updated control variables to acquire an updated NPV value; (6) judging whether the updated NPV value is larger than the current NPV value or not, if so, continuing the step (7), if not, halving the iteration step Lambda k, and returning to the step (4); (7) judging whether the convergence condition is met or not, if so, continuing the step (8), if not, setting the K = k+1, and returning to the step (3); (8) outputting the optimal control variable, and stopping the computation.

The invention discloses a grading material specific area determining method based on three-dimensional laser scanning and the image processing technology. For a rock mass larger than 50mm, three-dimensional scanning point clouds are obtained; a rock mass three-dimensional model is established by using the scanning point clouds to obtain the volume and the surface area of the rock mass; and the specific area is the rock mass larger than 50mm is obtained by calculating based on a specific area definition. For a rock mass with the size being 5-50mm, the circumference and area are calculated by using image processing; and the specific area of the rock mass with the size being 5-50mm is calculated by using a spherical model. The specific area of a powder particle being smaller than 5mm is obtained by referring to specific area test results of existing powder materials. A rock mass size-specific area variation curve is drawn based on specific area data obtained by the three modes. A gradation distribution curve of rockburst is obtained. The rock mass size-specific area variation curve and the gradation distribution curve of the rockburst are drawn in one diagram to obtain a grading material specific area curve.

The invention discloses a tracking method and a tracking apparatus for a panoramic video moving direction. The method is performed through the following steps: determining the moving direction of a camera by conducting pixel tracking to the right lower part of a panoramic video of a spherical model from a cloud terminal or a server terminal, obtaining data on the moving direction, and storing the obtained data on the moving direction in the server terminal or the cloud terminal separately. When a request is made from a user's terminal for a video file containing the data on the moving direction, the server terminal or the cloud terminal sends the video data to the user's terminal in accordance to the request and transmits the data on the moving direction at the same time so that the current playing visual angle can be tuned. According to the invention, the tracking method enables a user to move to a camera, and this means that he or she does not have to slide their fingers or turn around to change a current playing visual angle.

The invention discloses a method for rendering character animation in an artistic manner with the assistance of a computer. The method is based on an illumination spherical model. The invention is characterized in that the illumination spherical model which extracts and creates an artistic style from a work of art is applied to rendering of a character model, so that coloring of an artistic style is realized conveniently and rapidly, and character animation can be manufactured as if by non-photorealistic rendering. By drawing on a method for rendering information about illumination on a sphere, the invention ensures that when a complex object which is uniform in illumination material is rendered, the illumination is consistent in an all-round manner. Because of extraction and application of the illumination spherical model, character rendering of the artistic style can be realized conveniently and rapidly only through simple interactive operation, so that rendering efficiency is improved. The invention solves the problems that the prior computer assisted animation has low rendering efficiency, and the traditional image technology cannot give expression to works of an artist flexibly.

The invention relates to a method for playing a virtual reality (VR) panoramic video. The method comprises the following steps: shooting the existing picture by shooting equipment to acquire flat panoramic video stream; acquiring and decoding the planar panoramic video stream into a video frame by a panoramic video player; establishing a 2D spherical model according to the horizontal and vertical direction field angle of a shooting lens; performing spherical angle segmentation to acquire a 2D spherical model and generate a spherical surface vertex array; connecting all the spherical surface vertexes to form grids, establishing a three-dimensional model described by the grids and establishing a visible grid set; adhering texture of the corresponding grids; setting a pyramid frustum near plane, a far plane, a viewpoint and an API interface according to the panoramic video payer to obtain the size of a screen viewport; and drawing the planar panoramic video stream on the screen according to the size and the initial position coordinates of each split screen window of left and right split screens to realize panoramic video playing. By the method, VR equipment can display images accurately in real time.

The invention provides a fish eye video real-time panoramic correction method based on a spherical surface spreading model and belongs to the field of image video processing. The method includes the following steps: fish eye image acquisition, fish eye image pre-processing, fish eye image profile extraction, image geometrical relation converting, re-projection based on fish eye image, and fish eye video roaming. According to the invention, the method includes the following specific steps: after acquiring a fish eye video, firstly resolving the radius of a corresponding "spherical model" of a fish eye image, then performing selection, and restoring each pixel of each frame of fish image to one "spherical model"; then expanding each pixel of the spherical surface to one correction plane according to a corresponding spherical arc; and finally conducting sampling and interpolation on the corrected pixels to obtain a corrected image of the fish eye image. According to the invention, compared with algorithms of same types, the method overcomes the limitation of wide viewing angle and timeliness, addresses unexpandability of the spherical surface, effectively increases image correction precision, achieves fish eye video panoramic expanding, meets real-time applications, has certain robustness for fish eye cameras of different models, and has strong practicality.

The invention belongs to a three-dimensional panoramic technology, and provides a method for browsing a panorama by a hot spot in three-dimensional panoramic space. The method comprises the following steps of: 101, establishing a system operation environment; 102, computing the radius of a three-dimensional panoramic spherical model; 103, establishing the three-dimensional panoramic spherical model; 104, wrapping a two-dimensional panorama on a three-dimensional sphere; and 105, forming the three-dimensional panorama. The invention also provides a three-dimensional panorama browsing system. The system comprises a three-dimensional panorama browsing module and an editing management module. The method and the system show the three-dimensional panorama, have real and smooth picture frames, and can be widely used for the three-dimensional panorama show of any scene.

The present disclosure relates to an image display method performed by a head-mounted display device. The device establishes a rectangular projection plane model that shares a same aspect ratio with a picture shot by a lens and then transforms the rectangular projection plane model into a shaped projection plane model through anti-distortion processing. Next, the device defines a shaped cambered spherical model by intersecting the shaped projection plane model with a spherical model according to a horizontal field angle and a vertical field angle of the lens and then projects an original distorted image onto the shaped cambered spherical model to remove image distortion. Finally, the device displays the image rendered on the shaped cambered spherical model.

The invention discloses a method of correcting a fisheye image. The method comprises steps: a fisheye image is acquired through a fisheye lens preset in a panoramic camera; the optical imaging center and the spherical radius of the fisheye image are determined; according to the optical imaging center and the spherical radius, a double-longitude spherical model is built; according to the double-longitude spherical model, the fisheye image is corrected to obtain a correction image; and the correction image is restored through a preset target restoration mathematical model, a target correction image is obtained. The invention also discloses a device for correcting the fisheye image. The fisheye image correction effects can be improved.

The invention relates to a ball screen projection technology, in particular to a method for performing ball screen projection processing on a planar picture to be displayed by using a computer. The method comprises the following steps of: A, constructing a spherical model consistent with the shape of a ball screen; B, performing unfolding ultraviolet (UV) on the spherical model, and attaching the planar picture to be displayed to the spherical model to obtain a spherical picture to be displayed; and C, unfolding the spherical model to form a rectangle in which the longest weft on a spherical surface is used as the length and a warp is used as the width, and thus obtaining a rectangular picture to be projected. The key point is that inverse conversion is performed; the projection action of a projector is positive conversion; the spherical picture is subjected to the inverse conversion and then the positive conversion, so that the finally displayed content is the spherical picture to be displayed by projection; therefore, the phenomena of distortion and deformation which influence the appearance are avoided.

The invention provides a spherical mosaic method and system of a video image. The system comprises a calibration module, an area correction module, a total graph regulation module, a cutting module, a rotating and scaling module and a display module, wherein the calibration module is used for calibrating each parameter in a camera; the area correction module is used for correcting each position in a set area; the total graph regulation module is used for regulating each position in each path of video image; the cutting module is sued for cutting each path of video image; the rotating and scaling module is used for rotating and scaling each path of video image; and the display module is used for displaying on a spherical model. The spherical mosaic method realized by the invention is simple and is low in configuration required by a computer, each path of video image is independently processed and does not mutually interfere, and therefore, processing speed is high. High instantaneity still can be obtained under the mosaic of multiple paths of high-resolution cameras. The system can be applied to real-time video mosaic and is combined with an OpenGL (Graphics Library) graphic program interface to project each path of image to be displayed on the spherical model to achieve a good display effect; and meanwhile, the system is suitable for the mosaic of a wide angle camera and has the advantages of small blind point area and high practicality.

A plane seismic exploration signal decomposition method based on a Kriging method belongs to the field of exploration geophysics. The method comprises the following steps: acquiring a seismic exploration signal, setting the basic lag distance and the maximum lag distance, and calculating a two-dimensional experimental variation function of a seismic attribute slice to obtain a two-dimensional variation function graph; determining ellipse information corresponding to target information from the variation function graph, extracting experimental variation function curves of long-axis and short-axis directions (respectively corresponding to primary and secondary directions of the target information), and using a theoretical model to perform one-dimensional second-order nested fitting; determining the initial parameters, including sill, long-axis range, ellipse direction and the ratio of long axis to short axis, of the two-dimensional variation function according to the parameters of the separated variation function curves of the primary and secondary directions, tuning parameters, selecting different models (spherical model, exponential model, Gauss model), and making the fitted two-dimensional variation function more consistent with a target signal experimental variation function; and determining a two-dimensional theoretical variation function, substituting the function into a Kriging interpolation equation, and decomposing to obtain the target information.

The invention discloses a self-positioning orientation plotting method based on GPS RTKs and panoramic images. According to the self-positioning orientation plotting method, by utilizing the panoramic images obtained by using a panoramic camera and site coordinates measured by using the GPS RTKs, direct measurement on ground feature in shared areas of two groups of panoramic images can be achieved by using a three-dimensional front intersection calculation method based on a measured intersection angle in a panoramic image spherical model, so that three-dimensional coordinate information of the ground feature of the shared areas of the panoramic images can be rapidly obtained. The purpose that the ground feature is directly measured on the panoramic images can be achieved, and data and site measured distance of the ground feature can be rapidly obtained, so that ground feature information requested by three-dimensional modeling, scene reconstruction and digital city construction can be obtained.

The invention discloses a Kriging ground settlement time domain monitoring method based on a simulated annealing method. The method comprises the following steps of: extracting monitoring information, performing normal conversion, and determining the dimension scale of equivalent dimension dynamic prediction; dividing time groups, calculating a variable function value which corresponds to each time group, selecting a spherical model as a variable function model, and fitting the variable function model by using the simulated annealing method; and drawing a variable function curve, calculating Kriging weight coefficients, calculating an estimation value of Kriging interpolation at a predicted moment, performing iterative calculation, interpolating and encrypting grids in a time domain, and generating a settlement monitoring result at a quasi monitoring moment. The Kriging ground settlement time domain monitoring method has the advantages that high-accuracy prediction can be performed according to the characteristic of ground settlement data abnormal distribution, the abnormal situation of monitoring points can be effectively and truly reflected, and the phenomenon of falling of a solution into a local extremum caused by high dependence of a linear inversion method result on selection of an initial model can be avoided.