| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 382280000 | Fourier transform | 22 |
| 20090034875 | IMAGE DETECTION APPARATUS AND METHOD - Provided is an apparatus and method for detecting an image enhanced from a low resolution image to a high resolution image. An apparatus for detecting an image converted from a first resolution to a second resolution higher than the first resolution, the apparatus including: a frequency converter converting a received second resolution image signal to a frequency domain; and an image determiner calculating energy per frequency from the received second resolution image signal converted to the frequency domain, and if an amount of energy in over a pre-set frequency is less than a threshold, determining that the received second resolution image signal corresponds to a second resolution image converted from a first resolution image, and if the amount of energy in over the pre-set frequency is greater than the threshold, determining that the received second resolution image signal corresponds to a real second resolution image. Accordingly, by detecting an image converted from the first resolution to the second resolution higher than the first resolution, the detected image is separately processed, thereby enhancing image quality. | 02-05-2009 |
| 20090041381 | Method and Apparatus for Radiance Processing by Demultiplexing in the Frequency Domain - Method and apparatus for radiance processing by demultiplexing in the frequency domain. A frequency domain demultiplexing module obtains a radiance image captured with a lens-based radiance camera. The image includes optically mixed spatial and angular frequency components of light from a scene. The module performs frequency domain demultiplexing on the radiance image to generate multiple parallax views of the scene. The method may extract multiple slices at different angular frequencies from a Fourier transform of the radiance image, apply a Fourier transform to each of the multiple slices to generate intermediate images, stack the intermediate images to form a 3- or 4-dimensional image, apply an inverse Fourier transform along angular dimension(s) of the 3- or 4-dimensional image, and unstack the transformed 3- or 4-dimensional image to obtain the multiple parallax views. During the method, phase correction may be performed to determine the centers of the intermediate images. | 02-12-2009 |
| 20090041382 | SIMULATION METHOD OF OPTICAL IMAGE INTENSITY DISTRIBUTION, PROGRAM, AND METHOD OF MANUFACTURING SEMICONDUCTOR DEVICE - The intensity distribution of an optical image in a resist film is calculated (S | 02-12-2009 |
| 20090103832 | METHOD AND SYSTEM FOR ENABLING REAL-TIME SPECKLE PROCESSING USING HARDWARE PLATFORMS - Embodiments of the invention enable real-time speckle processing of video feeds that further enables the Speckle algorithm to be applied in numerous real-time applications. Exemplary embodiments of the invention include hardware, software and machine readable mediums for an accelerator for the Speckle atmospheric compensation algorithm. | 04-23-2009 |
| 20090136154 | System and method for image sensing and processing - A system and method for image sensing and processing using the Arithmetic Fourier Transform (AFT). An image sensing array has sensors located based on a set of Farey fractions, each multiplied by a unit block size of the array. Similar sampling can be achieved by interpolating the pixel values of a conventional, uniformly spaced array of sensors. The AFT can be determined extremely efficiently by computing weighted sums of the representative pixel values. Corresponding Discrete Cosine Transform (DCT) coefficients can then be computed by scaling the AFT coefficients. As a result, the number of multiplication operations required to compute the DCT is dramatically reduced. | 05-28-2009 |
| 20090154832 | ALPHA-MASKED RST IMAGE REGISTRATION | 06-18-2009 |
| 20090245686 | VIDEO BANDWIDTH RESOLUATION IN DFT-BASED SPECTRUM ANALYSIS - A method and apparatus for improved video bandwidth resolution in DFT-based spectrum analysis is disclosed. A first embodiment comprises an emulation of a continuous range of video bandwidths in DFT-based spectrum analysis using overlapping resolution bandwidth frames. A second embodiment utilizes frame weighting to reduce the standard deviation in the spectrum of noise signal to emulate a corresponding standard deviation of a specified video bandwidth. | 10-01-2009 |
| 20100002955 | Method for image reconstruction using sparsity-Constrained correction - Pixel images {circumflex over (f)} are created from projections (q | 01-07-2010 |
| 20100054626 | METHOD OF FAST IMAGE RECONSTRUCTION - The present invention provides a method of fast image construction. The wavelength information is extracted in advance based on characteristics of a Fourier domain Optical Coherent Tomography (OCT) system, to obtain a vector of wavelengths which are in a uniform distribution in a wave number space, and thus to obtain a virtual position coefficient of this wavelength vector at a CCD, from which a weight matrix is calculated based on a transfer function for a discrete Fourier transform with zero-padding interpolation. In operation of the system, the interpolation is carried out based on the weight matrix and collected data, or is carried out based on the weight matrix which has been truncated by being subject to windowing and the collected data, to obtain interpolated data satisfying requirements. The method according to the present invention is simple and easy to implement, by which, it is possible to improve the precision and speed of the Fourier domain OCT data process, and thus to improve the capacity of real-time image reconstruction of the Fourier domain OCT system. | 03-04-2010 |
| 20100067826 | Method for Image Skew Detection - A method for calculating a skew angle of an original image, executed at least in part on a computer system stores image data for the original image in an electronic memory, then forms an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data. A partitioned image is formed by partitioning the energy-normalized image into a number of sub-regions. A summed region is formed as a combination of image pixel data from the sub-regions. A Fourier magnitude spectrum is obtained by performing a Fourier transform on the summed region. The skew angle is calculated according to the peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles. An output signal indicates the calculated skew angle. | 03-18-2010 |
| 20100067827 | OPTICAL IMAGE PROCESSING USING MINIMUM PHASE FUNCTIONS - A method utilizes an optical image processing system. The method includes providing a measured magnitude of the Fourier transform of a complex transmission function of an object or optical image. The method further includes providing an estimated phase term of the Fourier transform of the complex transmission function. The method further includes multiplying the measured magnitude and the estimated phase term to generate an estimated Fourier transform of the complex transmission function. The method further includes calculating an inverse Fourier transform of the estimated Fourier transform, wherein the inverse Fourier transform is a spatial function. The method further includes calculating an estimated complex transmission function by applying at least one constraint to the inverse Fourier transform. | 03-18-2010 |
| 20100195931 | IMAGE RECONSTRUCTING APPARATUS AND IMAGE RECONSTRUCTING METHOD - When a group of (pre-processed) projection data is stored into a projection-data storage unit, a Gaussian-based expansion-data creating unit creates a group of Gaussian-based expansion data that is expanded from each of the group of projection data through linear combination based on a plurality of Gaussian functions that is stored by a Gaussian-function storage unit and has different center points. A reconstruction-image creating unit then creates a reconstruction image by using the Gaussian-based expansion-data created by the Gaussian-based expansion-data creating unit, and stores the created reconstruction image into an image storage unit. | 08-05-2010 |
| 20110200272 | DISCRETE FRACTIONAL FOURIER NUMERICAL ENVIRONMENTS FOR COMPUTER MODELING OF IMAGE PROPAGATION THROUGH A PHYSICAL MEDIUM IN RESTORATION AND OTHER APPLICATIONS - A system for numerically modeling evolution of an image propagating through a medium includes image using image data and a propagation medium model. The propagation medium model aligns a propagation centerline of the propagation medium model relative to the center of the image data. The propagation medium model has a numerical operator for applying an index-shifted numerical fractional Fourier transform operation on the image data, and aligning the zero original-domain origin relative to the center of the image data. The image data has spatially-indexed amplitude values and a center located relative to the spatially-indexed amplitude values. The propagation medium model has quadratic phase properties which are defined relative to a propagation centerline of the propagation medium model. Aligning the zero original-domain origin relative to the center of the image data to produces transformed image data having a zero frequency-domain origin that is centered within the transform-domain indices. | 08-18-2011 |
| 20110274369 | COMPOSITE EVALUATION - A method of evaluating a composite structure in which a portion of the structure is imaged and subsequently transformed to provide a 2D output of the angular distribution of features, eg a 2D FFT. A weighting function is applied to the output to compensate for variation in the angular density of pixel population. The weighted output is then used to provide an angular distribution of feature intensity. The structure can be imaged in two or more intersecting planes to allow a 3D determination of feature direction to be obtained. | 11-10-2011 |
| 20120099803 | OPTICAL IMAGE PROCESSING USING MAXIMUM OR MINIMUM PHASE FUNCTIONS - A method utilizes an optical image processing system. The method includes calculating a product of (i) a measured magnitude of a Fourier transform of a complex transmission function of an object or optical image and (ii) an estimated phase term of the Fourier transform of the complex transmission function. The method further includes calculating an inverse Fourier transform of the product, wherein the inverse Fourier transform is a spatial function. The method further includes calculating an estimated complex transmission function by applying at least one constraint to the inverse Fourier transform. | 04-26-2012 |
| 20130121614 | System and Method for Editing Frequency Content of Images - Systems, methods, and computer-readable storage media for editing the frequency content of an image may provide an intuitive interface for examining and/or modifying the frequency content. The methods may include accessing image data, performing a wavelet transform of the image data (or another MRA technique) to produce a time-frequency representation (TFR) of the image representing frequency content in multiple frequency bands, and displaying an indication of the frequency content of the image by displaying a sub-image of the TFR or numerical data representing the frequency content at selected pixels. In response to receiving input specifying a desired frequency content modification, the methods may include performing a Fourier transform of the image data to produce frequency content data, modifying the frequency content data, and performing an inverse transformation of the modified data to produce modified image data. The modification may be applied globally or to a selected portion of the image. | 05-16-2013 |
| 20130121615 | Method and Apparatus for Managing Artifacts in Frequency Domain Processing of Light-Field Images - Various methods and apparatus for removing artifacts in frequency domain processing of light-field images are described. Methods for the reduction or removal of the artifacts are described that include methods that may be applied during frequency domain processing and a method that may be applied during post-processing of resultant angular views. The methods may be implemented in software as or in a light-field frequency domain processing module. The described methods include an oversampling method to determine the correct centers of slices, a phase multiplication method to determine the correct centers of slices, a method to exclude low-energy slices, and a cosmetic correction method. | 05-16-2013 |
| 20130266241 | COMPUTATIONAL IMAGING USING VARIABLE OPTICAL TRANSFER FUNCTION - In selected embodiments, improved image restoration is realized using extensions of Wiener filtering combined with multiple image captures acquired after simple, fast reconfigurations of an optical imaging system. These reconfigurations yield unique (distinct) OTF responses for each capture. The optical imaging system may reduce fabrication cost, power consumption, and/or system weight/volume by correcting significant optical aberrations. The system may be configured to perform independent correction of fields within the total field of regard. The system may also be configured to perform independent correction of different spectral bands. | 10-10-2013 |
| 20130272627 | METHODS AND SYSTEMS FOR PROCESSING A FIRST IMAGE WITH REFERENCE TO A SECOND IMAGE - An image registration method is disclosed for processing a distorted image into a registered image that is aligned with reference to an original image. Distortions from the original image may include scaling, rotation, and noise. The method is based on correlating Radon transforms of both images to determine the rotation angle, and the scaling factor is determined by dividing averages of the overall luminance of each image on the assumption that any added noise will cancel. The Fast Fourier Transform (FFT) is used to estimate global spatial shifts. In one embodiment, the distorted image is first scaled to the size of the original image before being rotated. In another embodiment, the original image is first scaled to the size of the distorted image before rotating the distorted image, and finally scaling it to match the original image. A corresponding system for image registration is also provided. | 10-17-2013 |
| 20130301954 | CHARGED PARTICLE BEAM DEVICE, AND IMAGE ANALYSIS DEVICE - In a scanning electron microscope, if a failure is caused to occur in a SEM image by the influence of a disturbance such as magnetic field or vibration inside and from outside the device, the cause is identified simply and accurately using this SEM image. There is provided a measurement technique whose measurement accuracy is not influenced by a roughness of SEM image pattern. A one-dimensional scanning is performed in a scanning-line direction (X direction) by setting the Y-direction scanning gain at zero at the time of acquiring the SEM image, and a two-dimensional image is created by arranging image information, which is obtained by the scanning, in a time-series manner in the Y direction. A shift-amount data on the two-dimensional image is acquired using a correlation function, and the magnetic field or vibration included within the SEM image is measured by a frequency analysis of the data. | 11-14-2013 |
| 20140198995 | METHOD AND APPARATUS FOR COMPUTING IMAGE PYRAMIDS AND RELATED COMPUTER PROGRAM PRODUCT - An embodiment of a method for computing pyramids of input images (I) in a transformed domain, e.g., for search and retrieval purposes, includes:—arranging input images in blocks to produce input image blocks,—subjecting the input image blocks to block processing including: transform into a transformed domain, subjecting the image blocks transformed into a transformed domain to filtering, subjecting the image blocks transformed into a transformed domain and filtered to inverse transform implementing an inverse transform with respect to the previous transform into a transformed domain, thus producing a set of processed blocks. The set of processed blocks, which is recomposeable to an image pyramid, may be used, e.g., in detecting extrema points in images in the pyramid, extracting a patch of given size around the extrema points detected, and processing the patch to obtain local descriptors such as SIFT descriptors of a feature. | 07-17-2014 |
| 20160148382 | ESTIMATING RAINFALL PRECIPITATION AMOUNTS BY APPLYING COMPUTER VISION IN CAMERAS - A method and system are provided. The method includes storing a set of references images without rain and spanning a plurality of different light conditions. The method further includes capturing, using a camera, an image of a scene with rain. The method also includes selecting a reference image from the set of reference images based on the light condition of the captured image. The method additionally includes performing an arithmetic subtraction image processing operation between the captured image and the reference image to generate a subtraction image. The method further includes estimating an amount of rain in the subtraction image based on previously calibrated values. | 05-26-2016 |
