31 results about "Discrete transformation" patented technology

In a method and / or an OFDM device for SC-FDMA data transmission, a sequence of input data is transformed by means of a discrete transformation as transformed data signals of coded and modulated data signals on first frequency channels into a first frequency space over a first number of frequencies. The transformed data signals are mapped on second frequency channels in a second frequency space with a larger second number of frequencies. The transformed data signals on the second frequency channels are inverse-transformed using an inverse transformation. Data inversely transformed in such a way are provided for transmission. The transformed data signals are mapped into a frequency range of the second frequency channels in such a way that a constant component of the transformed data signals is mapped centrally within the frequency range.

Disclosed are a system and a method for motion editing multiple synchronized characters. The motion editing system comprises: a Laplacian motion editor which edits a spatial route of inputted character data according to user conditions, and processes the distortion of the interaction time; and a discrete motion editor which applies a discrete transformation while the character data is processed.

The invention belongs to the field of image processing, provides a method for evaluating the quality of compression distortion three-dimensional (3D) images and particularly provides an HVS (Human Visual System)-based objective quality evaluation method for 3D information, and the HVS-based objective quality evaluation method has better result consistency with subjective evaluation. The technical scheme adopted by the invention is as follow: the HVS-based objective quality evaluation method comprises the following steps of: (1) converting an original 3D color image used in an experiment into a gray level image; (2) processing the converted gray level image by adopting a discrete Contourlet transforming filter group; (3) obtaining the decomposition coefficients of 3D image pairs in different spatial frequency bands after decomposition by the discrete Contourlet transforming filters; (4) realizing a masking effect through carrying out gain control on data which are subjected to CSF (Critical Success Factor) weighting in the spatial frequency bands; (5) obtaining 3D viewpoint pairs which are subjected to HVS modeling; and (6) evaluating the objective quality of the 3D image by adopting HPSNR (High Peak Signal-Noise Ratio). The HVS-based objective quality evaluation method for the 3D information is mainly applied to the design and manufacture of image sensors.

A method of computing the electromagnetic scattering properties of a structure comprising materials of different properties and the structure is periodic in at least one transverse direction and extends in a perpendicular direction, comprising: by analyzing a plurality of modes in at least one transverse direction Each corresponding mode in , performs a pseudospectral polynomial (Chebyshev) expansion in the vertical direction multiplied by the integral of the 1D Green's function using the same sample points in the orthogonal direction for all of the modes (1350 ), numerically solve the volume integral equation for electromagnetic scattering for each mode. The integration is performed by solving a regularized linear system of equations between the first (1116) and second (1120) discrete transformation steps to compute (1118) the values ​​of the regularized Chebyshev polynomial coefficient vector (γ). The results of the numerical solution are used to calculate the electromagnetic scattering properties of the structure.

The invention discloses an image encryption method based on multi-parameter fractional-order discrete Tchebichef transformation, and relates to the technical field of digital image processing and information safety. The method comprises the steps: employing the transformation order number of fractional orders of an image block, the initial value of a generation sequence and system parameters as the secret key of image encryption, and then carrying out the encryption of an image. The image decryption process is an inverse process of the above process, and comprises the steps: decrypting the encrypted image through a right secret key and a wrong secret key, and respectively obtaining a right decrypted image and a wrong decrypted image. Experiment analysis indicates that the method provided by the invention is very high in safety. The method increases the secret key space, and improves the safety of an encryption system. In addition, a ciphertext image obtained through the method provided by the invention is a real-value image, and the size of the ciphertext image is the same as the size of an original image, thereby facilitating the displaying, transmission and storage.

In one embodiment, it is proposed a method for encoding a light field content. The method is remarkable in that it comprises: —obtaining, for a set of light rays (401) associated with said light field content, four coordinates per light ray from a two planes parametrization (2000; 402, 403) of said light field content; —obtaining (2001), for each light ray from said set, two coordinates from said four coordinates, corresponding to a projection of said light rays from said set onto a plane (404, 405, P) perpendicular to two planes used in said two planes parametrization, defining points in a first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)); —applying (2002) a discrete Radon transform on said first 2D ray diagram (Π(χ1, χ2), Π(χ1, χ2)) that delivers lines of interest in said first 2D ray diagram; —encoding (2003) said lines of interest into encoded lines of interest; and—storing (2004) said encoded lines of interest.

A scalable coder having a grid motion estimation and compensation module (110), a motion compensation temporal filtering module (105), a scalable coding module (115), a discrete transformation module(120), and a packetization module (135). The grid-motion estimation and compensation module (110) outputs a scalable motion vector from the source video data, supplied resolution and bit rate parameters. The motion compensation temporal filtering module (105) generates, from the source video data and the scalable motion vector, a residual image corresponding to the difference between the present and previous image frames. The scalable coding module (115) is coupled to receive and encode the scalable motion vector. The discrete transformation module (120) is configured to receive and domain transform the supplied video to a sequence of coefficients. The packetization module is coupled to the scalable coding module (115) and the discrete transformation module (120), and is operable to combine the encoded scalable motion vector and the sequence of coefficients into a packet.

The invention provides a method for transforming a continuous-time filter to a discrete-time filter. The method includes: sampling input quantity and output quantity of a controlled system, and utilizing an identification algorithm for obtaining a continuous-time model of the system; constructing the continuous-time filter according to the continuous-time model; adopting a partial differential equation method to compute a coefficient matrix of the discrete-time filter according to coefficients in a continuous-time filter equation and adopted time of a discrete system; and constructing a discrete-time filter structure. The discrete-time filter is obtained by performing discrete transformation to the designed continuous-time filter. Compared with an existing discrete-time filter design method, the method has the advantages that discretization processes of a controlled object and filter designing processes based on the discrete system are decreased, and by utilizing advantages of a filter design theory based on a continuous-time system, the filter excellent in performances can be designed, system design and development time can be saved, and the method is particularly suitable for practical engineering application of digital control systems.

The invention discloses a turbulent image denoising method, comprising the following steps: performing single-layer two-dimensional discrete wavelet transform on the noisy turbulent image; extracting high-frequency coefficients and performing fast discrete Curvelet transform on the noisy turbulent image; The threshold T is estimated by the Yeesian criterion, and the adaptive selection method of the threshold is improved to obtain the optimal threshold and obtain a denoised turbulent image. The present invention provides a turbulent image denoising method, which can well protect image detail information, suppress boundary artifacts, and significantly improve visual effects. At the same time, the invention achieves higher peak signal-to-noise ratio and lower mean square error, and effectively removes the noise of the turbulence degraded image.

The invention relates to a servo system online debugging method of a two-axis two-frame photoelectric image stabilization platform. The method is as follows: calibrate the open-loop transfer model of each loop; for any loop, set the expected design bandwidth of the loop as and the initial time Gain parameters of the loop controller, recursively obtain the estimated value of the expected gain parameter and the bandwidth error of the loop controller; perform discrete transformation on the estimated value of the gain parameter and the preset zero position parameter to obtain the discretized control parameters, and use this group of discretized The control parameters are closed-loop tested to obtain the corresponding test curves; the discrete control parameters corresponding to the ideal test curves are solidified as ideal discrete control parameters to the servo control board to complete the debugging of the platform servo system. The invention can perform real-time and intuitive servo system regulation on the platform, has simple and convenient operation, and saves manpower and time costs.

The present invention proposes a method, device and system for error concealment in video communication, including determining the current block of the current slice of the current image of the video sequence used for error concealment by the processor during the encoding process, which is the current block determining recovery data, wherein the recovery data includes at least one of the following: coefficients of discrete transformation performed on the current block and similarity data related to a first block similar to the current block, and the slice where the first block is located is the same as The current slice is not the same, and the current block and recovery data are sent over the network, where the current block is sent as in-band data and the recovery data is sent as out-of-band data.