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We developed MR insertable small animal PET utilizing high resolution event positioning circuit and charge signal transmission approach. A further study will be performed to improve PET image quality by applying correction algorithms and to evaluate the performance of small animal PET mounted inside the MR bore to simultaneously acquire hybrid PET/MR images.
This live demonstration shows a biology-inspired highly efficient approach to high-speed video data acquisition based on the ATIS image sensor technology. Gray-level image information is acquired pixel-individually and event-driven at a temporal resolution equivalent to thousands of frames-per-second while the data rate is kept at a fraction of the rate encountered with conventional high-speed cameras...
Infrared Focal Plane Arrays have been developed with reductions in pixel size below the Nyquist limit imposed by the optical systems Point Spread Function (PSF). These smaller sub diffraction limited pixels allows spatial oversampling of the image. We show that oversampling the PSF allows improved fidelity in imaging, resulting in sensitivity improvements due to pixel correlation, reduced false alarm...
We present Terahertz imaging with a 1D multichannel time-domain spectroscopy system (TDS) which operates with a photoconductive array of 15 detection channels excited by a 1030 nm femtosecond fiber laser. The emitter and detector are photoconductive antennas based on InGaAs/InAlAs multi-layer heterostructures (MLHS). The simultaneous measurement of 15 THz pulses with a pixel pitch of 1 mm increases...
Bridge plays an important role in people's life. The automatic bridge detection has great value especially in disaster situation. In this paper, we propose an automatic bridge detection method in multispectral image to detect bridges over water. First, we extract the water region using NDWI index method by taking the advantage of the spectrum properties of water. Second, the water region is extended...
Most existing test system for infrared focal plane arrays are dedicated, it costly and the application value are limited. A test method for infrared focal plane arrays is introduced in this paper, and test system includes driving circuit, control module, data acquiring and processing circuit, video synthesis module and the PC software based on LabVIEW is established, which measures the key parameters...
Although eye detection has been studied for a long time in academic and industrial communities, it is still a changeling problem if facial images are with varying head poses, facial expressions, illuminations and resolution changes etc., which tend to happen in uncontrolled conditions. In this work, we propose to learn deep features that could capture the appearance variations of eyes for eye detection...
This paper deals with the interactive design of generic classifiers for aerial images. In many real-life cases, object detectors that work are not available, due to a new geographical context or a need for a type of object unseen before. We propose an approach for on-line learning of such detectors using user interactions. Variants of gradient boosting and support-vector machine classification are...
An efficient approach to achieve ground moving target indication (GMTI) for synthetic aperture radar (SAR) is to use the Monopulse-SAR system. This paper examines the statistics of monopulse ratio (MR) for SAR/GMTI model when complex Gaussian clutter-plus-noise is considered. The probability density function (pdf) of MR is analyzed in detail. Especially, the conditional likelihood function of MR under...
In this paper, a new adaptive and fast Constant false alarm rate (CFAR) target detection algorithm based on two level CFAR (TL-CFAR) detectors in high-resolution synthetic aperture radar (SAR) images is proposed. In the first level, the initial mask of targets is obtained by Cell Averaging CFAR (CA-CFAR) detector. In the second level, the precise parameters estimation of CFAR in the local window is...
In this paper, we introduce the first analysis of ship detection performance using simulated RADARSAT Constellation Mission (RCM) data in the Ship Detection, Low and Medium Resolution modes. The ship detection performance is assessed for a number of linear and compact polarimetric (CP) dual-polarimetric (dual-pol) systems data simulated from RADARSAT-2 Fine quad mode in the three RCM modes. The impact...
This conference poster present an alternative derivation of a well known formula that relates both to the concept of reduced brightness in a charge-particle (CP) beam and to the blurring of field-ion image spots. It is then argued that field ion images provide a practical illustration of some aspects of CP optics, including the issue of whether reduced brightness is always a conserved quantity.
The most recent developments in THz technology and new explorations show that THz waves are ideally suitable for the remote sensing and security applications. And unlike X-ray, THz waves do not penetrate living cell material and are completely safe for humans. In this paper, we describe the implementation of a 0.435 THz imaging system with 1 mm-scale resolution, which can successfully detect concealed...
In this paper we propose human detection algorithm based on CENTRIST visual descriptor and scale of edge selection. Contour is the most feasible method to detect human object, and the sign of neighbor pixel is the key of contours. CENTRIST feature is particularly suitable for human detection since it obtains the sign information and contours could be represented precisely by feature vectors. However,...
The paper deals with the problem of early detecting cracks in composite materials for avionic applications. In particular, the authors present a THz imaging system that exploits compressive sampling (CS) to detect submillimeter cracks with a reduced measurement burden. Traditional methods for THz imaging usually involve raster scan of the issue of interest by means of highly collimated radiations...
Ship detection using high resolution remote sensing images is a hot research topic in both military and civilian applications. In this paper, a new method for detection of ships docked in a harbor was proposed, in which, Harris corner detector combined with local salient region analysis were used to extract the obvious sharp-angled feature related to the fore part of a ship in satellite images. This...
Images captured using standard flat digital detectors for microfocus X-ray systems have some disadvantages (uneven brightness distribution, irregular image resolution and geometrical distortions of the studying object). Using a non-planar detector (in the form of sphere surface part) will improve result image characteristics.
Pedestrian detection in low resolution videos can be challenging. In outdoor surveillance scenarios, the size of pedestrians in the images is often very small (around 20 pixels tall). The most common and successful approaches for single frame pedestrian detection use gradient-based features and a support vector machine classifier. We propose an extension of these ideas, and develop a new algorithm...
A novel ultra-broad bandwidth ultrasound detector is demonstrated using imprinted polymer microring, with flat frequency response up to ∼350 MHz at −3dB. A record high sub-3µm axial resolution in ultrasound/photoacoustic imaging applications is demonstrated.
We report a photon-counting depth imager with sub-centimeter resolution of low-signature targets at kilometer range. The system exploited a Peltier-cooled InGaAs/InP single-photon detector module and a 1550 nm wavelength pulsed laser with sub-milliwatt average powers.
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