224 results about "Coded aperture" patented technology

A system is described for capturing images comprising: a display for displaying graphical images and text; a plurality of apertures formed in the display; an image detector array configured behind the display and configured to sense light transmitted through the apertures in the display, the light reflected from a subject positioned in front of the display; and image processing logic to generate image data using the light transmitted through the apertures, the image data representing an image of a subject.

A method and apparatus for determining the range, radial velocity, and bearing angles of scattering objects reflecting RF signals or for determining the range, radial velocity, and bearing angles of sources RF signals. An array of antenna elements is utilized, the array of antenna elements each having an associated two state modulator wherein transmitted and/or received energy is phase encoded according to a sequence of multibit codes, the bits of the multibit codes each preferably having two states with approximately a 50% probability for each of the two states occurring within each given multibit code in said sequence of multibit codes, thereby allowing the determination of range, radial velocity, and bearing angles through digital computation after the scattered signals have been received.

In a system and method for reconstructing a scene, a light source transmits an optical pulse unto the scene, and a set of sensors receive a reflected pulse to acquire sensed signals corresponding to the optical pulse. There is a fixed coded aperture in an optical path between the light source and set of sensors. Then, a processor performs a method to reconstruct the scene as a three-dimensional (3D) depth map using a scene model.

The invention provides methods and apparatus for enhanced PCI and dual-use radiation imaging systems. In one implementation high resolution storage phosphor plate radiation detector (an area detector) is employed for conventional attenuation radiation imaging and/or PCI (including conventional PCI and coded aperture PCI). Slit and slot scan implementations for dual-use systems are introduced. Dedicated single and dual-use slit and slot scan system for conventional attenuation imaging and PCI are described that employ face-on or edge-on detectors. Slit and slot scan systems that employ area detectors are described. Edge-on, structured cell detector designs are described. Applications of edge-on structured cell detectors for CT, Nuclear Medicine, PET, and probe detectors are described.

A micro air vehicle having a navigation system with a single camera to determine position and attitude of the vehicle using changes the direction to the observed features. The difference between the expected directions to the observed features versus the measured direction to the observed features is used to correct a navigation solution.

The invention discloses a super-resolution imaging system based on a compression coding aperture and an imaging method thereof, mainly solving a problem of expensive imaging cost in the prior art. The method comprises the following steps: designing a convolution template, and making a coding aperture according to coherence of a light source; placing the prepared coding aperture at a position of aperture diaphragm in an optical system and pressing a shutter for imaging, and obtaining a low resolution coding image; transmitting the coding image to a master control computer, decoding super-resolution to reconstruct a high-resolution image, and using a denoising algorithm to remove an artificial trace in the high-resolution image. The system and the method are characterized in that: restriction of a Nyquist criterion is broken through, low frequency sampling is carried out on a scene, the high-resolution image is obtained through super-resolution reconstruction, data waste caused by first sampling and second compression of a traditional imaging system is overcome, in sampling, data volume is compressed, imaging cost, compression cost and transmission cost are reduced, and the system and the method can be used for infrared imaging and remote sensing imaging technology.

A combined format gamma-ray detector (D) for measuring impinging gamma-rays (10) includes an active upper level coded aperture detector plane member (12) that is suitable for detecting an impinging gamma-ray (10). An active lower level gamma ray detector plane member (14) that is spaced apart from the upper level coded aperture (12) detects an impinging gamma-ray (10). At low gamma-ray energies, the combined format gamma-ray detector device (D) operates as a conventional coded aperture system and at higher gamma-ray energies, the combined format gamma-ray detector device operates as a Compton scattering detector device.

The present invention enables snap-shot spectral imaging of a scene at high image generation rates. Light from the scene is processed through an optical system that comprises a coded-aperture. The optical system projects a plurality of images, each characterized by only one of a plurality of spectral components, onto a photodetector array. The plurality of images is interspersed on the photodetector array, but no photodetector receives light characterized by more than one of the plurality of spectral components. As a result, computation of the spatio-spectral datacube that describes the scene is simplified. The present invention, therefore, enables rapid spectral imaging of the scene.

The invention is suitable for the spectral imaging technical field, and provides a coded aperture spectral imaging system which comprises a preposition imaging system, a digital micro-mirror, a collimation system, a reflection raster, a microlens array and a detector. The microlens array comprises a plurality of microlenses; the filtering bands of the filtering layer on each microlens are different; the preposition imaging system images an object to be measured on the digital micro-mirror; the image after coded modulation is incident on the reflection raster through the collimation system to perform light splitting; a space spectrum mixing image is obtained after light splitting; a plurality of images are obtained through the microlens array with a filtering function; the detector simultaneously receives the plurality of images, and performs fusion decoding on the plurality of images to obtain the spectral information of the object to be measured. The coded aperture spectral imaging system can maintain system single rapid measurement, and meanwhile substantially improve system spatial resolution.

A method of using an image capture device to identify range information for objects in a scene includes providing an image capture device having an image sensor, a coded aperture having circular symmetry, and a lens; storing in a memory a set of blur parameters derived from range calibration data; capturing images of the scene having a plurality of objects; producing a set of reference edge images using the blur parameters from the stored set; providing a set of deblurred images using the captured image, the reference edges and each of the blur parameters from the stored set; and using the set of deblurred images to determine the range information for the objects in the scene.

The method of imaging a spatial distribution of photon emitters, the method includes producing an image with a resolution of at most about 180 microns using an imaging device including a detector and a coded aperture, wherein a photon emitted from the photon emitter has an energy of at most about 35 keV (5.6×10⁻¹⁵ J). Further provided is an imaging device for imaging a distribution of photons having energies of at most about 35 keV (5.6×10⁻¹⁵ J), which includes a coded aperture comprising a mask pattern having a plurality of holes, wherein the coded aperture is adapted to provide a resolution of at most about 180 micron, a detector on which a raw image is projected through the coded aperture; and a decoder that receives the raw image from the detector and produces an image having a resolution of at most about 180 micron.

This invention relates to coded aperture imaging apparatus and methods. In one aspect a coded aperture imager has at least one detector array and a reconfigurable coded aperture mask means. A reconfigurable coded aperture mask means can display various coded aperture masks to provide imaging across different fields of view and/or with different resolution without requiring any moving parts or bulky optical components. More than one detector array can be used to provide large area imaging without requiring seamless tiling and this represents another aspect of the invention. The present invention also relates to the use of coded aperture imaging in the visible, ultraviolet or infrared wavebands. The use of coded aperture imaging for imaging through a curved optical element is taught as the image decoding can automatically remove any aberrations introduced by the curved element.

The invention provides a high-angular-resolution light filed obtaining device and an image generation method. The high-angular-resolution light filed obtaining device in which a light coding aperture is combined with a micro lens array is constructed to solve the problem that resolution tradeoff causes low spatial resolution or image aliasing leads to decrease of the quality of a light field image. The high-angular-resolution light filed obtaining device comprises a main lens, the coding aperture, the micro lens array and a sensor which are successively arranged along a light transmission path. On the premise that the positional resolution of the light field is not increased, depth information in light field data is used to improve the angular resolution of the light field. The high-angular-resolution light filed obtaining device has the advantages of being high in the angular resolution, high in the signal to noise ratio, high in the passing rate and capable of collecting light-field videos. The light-field image generation method using the compressed sensing theory has the advantages of being high in the angular resolution and capable of removing image aliasing.

A radar system in which Coded Aperture Radar processing is performed on received radar signals reflected by one or more objects in a field of view which reflect a transmitted signal which covers a field of view with K sweeps and each sweep including Q frequency changes. For Type II CAR, the transmitted signal also includes N modulated codes per frequency step. The received radar signals are modulated by a plurality of binary modulators the results of which are applied to a mixer. The output of the mixer, for one acquisition results in a set of Q·K (for Type I CAR) or Q·K·N (for Type II CAR) complex data samples, is distributed among a number of digital channels, each corresponding to a desired beam direction. For each channel, the complex digital samples are multiplied, sample by sample, by a complex signal mask that is different for each channel.

Embodiments of the present invention relate to systems and methods for spectral imaging. Electromagnetic energy emanating from an object is passed through a first dispersive element, a coded aperture, and a second dispersive element to a detector plane. A wavelength-dependent shift is created by the first dispersive element. The coded aperture modulates the image emanating from the first dispersive element. The wavelength-dependent shift is removed from the modulated image by the second dispersive element producing a wavelength-independent image measured by the detector. A spectral image of the object is calculated from the measured image, a wavelength-dependent shift of the first dispersive element, the code of the coded aperture, and a wavelength dependent shift of the second dispersive element. A spectral image can be calculated from measurements obtained in a single time step and from a number of measurements that is less than the number of elements in the spectral image.

An X-ray detector array includes a scintillator that converts input X-ray radiation to secondary optical radiation output from the scintillator, a first telecentric micro lens array that array receives the secondary optical radiation, a phase coded aperture, where the first telecentric micro lens array directs the secondary optical radiation on the phase coded aperture, a second telecentric micro lens array, where the secondary optical radiation output from the phase coded array is directed to the second telecentric micro lens array, a patterned grating mask, where the second telecentric micro lens array directs the optical beam on the patterned mask, and a photodetector array, where the patterned mask outputs the optical beam in a pattern according to the patterned mask to the photodetector array, where the photodetector array outputs a signal, where a photon fringe pattern is imaged and sampled in the wavelength domain of the radiation from the scintillator.

The invention belongs to the digital image processing technical field and relates to a Fourier optical modeling-based coded aperture camera image restoration method. In order to decrease dependence on actual photographing and reduce noise error introduced by manual photographing, the imaging mode of a coded mask optical imaging system is quantitatively analyzed, and finally, the point spread function of a coded aperture camera can be obtained, and the point spread function is adopted as prior data to restore an image. According to the technical scheme of the invention, the Fourier optical modeling-based coded aperture camera image restoration method includes the following steps that: (1) a coded mask imaging system is quantitatively analyzed, and the coded mask imaging system generates a simulation point diffusion function of a coded aperture camera under arbitrary depths; and (2) with the point diffusion function under arbitrary depths in the step (1) adopted as a fuzzy kernel, de-convolution is performed on scene images photographed by the same coded aperture camera, and a simulation result is optimized according to a maximum posterior probability MAP principle, and the image of the original scene can be obtained. The Fourier optical modeling-based coded aperture camera image restoration method of the invention is mainly applied to digital image processing.

A method and apparatus for reducing noise in a coded aperture radar system, the coded aperture radar system transmitting signals which occur in sweeps, with K sweeps utilized to cover field of view of the coded aperture radar system and Q frequency shifts or steps occurring each sweep thereof. An array of N antenna elements is provided, the array of antenna elements each having an associated two state modulator coupled therewith. Energy received at the array is modulated according to a sequence of multibit codes, the number of codes in the sequence of codes comprising at least K times Q times N, thereby reducing noise in the coded aperture radar system compared to a coded aperture radar system radar system having fewer than K times Q times N codes in its sequence of multibit codes.

A method of using an image capture device to identify range information includes providing an image capture device having an image sensor, coded aperture, and lens; storing in memory a set of blur parameters derived from range calibration data; and capturing an image having a plurality of objects. The method further includes providing a set of deblurred images using the capture image and each of the blur parameters from the stored set by, initializing a candidate deblurred image; determining a plurality of differential images representing differences between neighboring pixels in the candidate deblurred image; determining a combined differential image by combining the differential images; updating the candidate deblurred image responsive to the captured image, the blur parameters, the candidate deblurred image and the combined differential image; and repeating these steps until a convergence criterion is satisfied. Finally, the set of deblurred images are used to determine the range information.

The invention discloses a coded aperture imaging system and a coding code plate thereof. The coding code plate comprises a metal part and one or more open holes; and in any range with the size of (4N+1) * (4N+1) of the coding code plate, the sum of the sizes of the open holes is (2N+1) * (2N+1), the any two sizes are in the range of (4N+1) * (4N+1), and the patterns of the open holes are not all the same. The coding code plate disclosed by the invention can not introduce the noise of the system due to the coding way; and furthermore, the coding code plate disclosed by the invention is simple in structure, reduces the processing difficulty and cost, and improves the assembly precision.