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A 16 × 16 staring imaging array was implemented in a 0.15-µm standard CMOS technology for terahertz detection in the range of 0.8 THz to 1.5 THz. Each pixel is composed of an antenna, a FET detector, and its readout electronics (a current integrator) so that the pixel signals of the whole matrix can be acquired simultaneously. The current integrator employs a 129-dB operational amplifier implementing...
In this paper we propose a phase-sensitive pixel concept based on an avalanche photodiode (APD) with a charge sensitive amplifier (CSA) readout circuit, and its implementation in a standard CMOS technology. We exploit the principle of APD gain modulation to realize the functions of optical sensing and demodulation of light signals in one component, which can be exploited in several application domains,...
For producing a single high dynamic range image (HDRI), multiple low dynamic range images (LDRIs) with different exposures are used. In high dynamic range imaging, a moving object in a set of LDRIs causes the ghost effect in a final HDRI. In this paper, we propose a ghost removal method based on histogram information. Object motion is detected by comparing ranks of intensity between LDRIs, and then...
We propose an expanding method for viewing window in the integral floating display with the tilted side mirrors. These additional mirrors make some rays change the propagation direction, and the reflected ray has large propagation angle compared with the conventional system. Because the maximum propagation angle of ray determines the viewing window size, the proposed system can enlarge the viewing...
The segmentation of ultrasound images is challenging due to the difficulty of appropriate modeling of their appearance variations including speckle as well as signal dropout. We propose a novel automatic segmentation method for 2D cardiac ultrasound images based on hidden Markov models (HMMs). By directly exploiting the local image characteristics around contour points in images and integrating them...
This paper proposes a new multi-exposure fusion algorithm for HDR imaging. The advantage of the fusion based method is that it does not actually generate HDR images so that the compression to LDR is also not needed. However, the conventional exposure fusion suffers from ghost effects when there are moving object or hand trembling because the output is just a weighted sum of multiple exposure input...
In this paper we present both theoretical modeling and experimental data on the noise performance of two different division of focal plane polarization imaging sensors. Theoretical estimations of the Stokes parameter signal-to-noise ratios for CCD polarization imaging sensors with both 4-polarizer and 2-polarizer micropolarization filter arrays are derived. The theoretical derivation is verified with...
Early detection of oil spill events is the key to environmental protection and disaster management. Current technology lacks the sensitivity and specificity in detecting the early onset of a small-scale oil spill event. Based on an infrared oil-water contrast model recently developed, we propose a novel non-scanning computational infrared sensor that has the potential to achieve unprecedented detection...
We present a novel method to model and estimate elastic geometric deformations of an observed object, whether they are caused by the object's own dynamic behavior, or by the dynamic behavior of the imaging device, or both. A procedure for estimating the space of possible deformations the object may undergo based only on a set of observations is derived. This information is then employed to derive...
Marked point processes have received a great attention in the recent years, for their ability to extract objects in large data sets as those obtained in biological studies or hyperspectral remote sensing frameworks. This paper focuses on an original Bayesian point process estimation for the detection of galaxies from the hyperspectral data ‘cubes’ provided by the Multi Unit Spectroscopic Explorer...
This paper proposes a new HDR imaging method in the gradient domain based on the fusion of two images with different exposure. We first formulate an energy function for the binary labeling of each pixel based on the brightness and contrast measure of each image, which gives a binary map that determines whether the under-exposed image is better than the overly exposed one or not. Then a target gradient...
In this paper, we present a semi-automated method for converting conventional 2D images to stereoscopic 3D. User-defined strokes that correspond to a rough estimate of the depth values in the scene are defined for the image of interest. With these strokes, our system thus determines what the depth values are for the rest of the image, producing a depth map that is ultimately used to create a stereoscopic...
CMOS X-ray imagers are gaining importance in the field of small area X-ray imaging. The paper gives a comparison of CMOS and a-Si flat panel imagers for X-ray imaging applications. Advantages of the CMOS imagers include the higher readout speed and lower noise due to the much higher electrical charge mobility in crystalline versus amorphous silicon. The lower noise provides a wider dynamic range in...
We establish the multipath model which encompasses the target and its multipath “ghosts” in urban and through-the-wall synthetic aperture radar (SAR). The focused downrange and crossrange locations of multipath ghosts are derived and validated using numerical and experimental data. The multipath model permits an implementation of a multipath exploitation algorithm, which maps each target ghost to...
Multi-photon excited fluorescence microscopy was utilized to monitor the biochemical changes associated with the development of silk-based engineered constructs into functional adipose tissue. Based on the intrinsic fluorescence of NADH and FAD, cells within vascularized adipose tissue demonstrated significantly higher metabolic activity than cells in non-vascularized control tissue.
In this paper, we present a new tonemapping operator to display high dynamic range image onto conventional displayable devices and printers. In our work, a new tone map algorithm, derived from the Contrast Limited Adaptive histogram Equalization (CLAHE) technique is presented. Due to different luminance intervals could result in overlapped reaction on the limited response in limited response range...
High-resolution image collections pose unique challenges to analysts tasked with managing the associated data assets and deriving new information from them. While significant progress has been made towards rapid automated filtering, alignment, segmentation, characterization, and feature identification from image collections, the extraction of new insights still strongly depends on human intervention...
We develop a new perspective invariant feature space representation of remotely sensed objects, regarding the features themselves as primitive observables of the 3D objects and to estimate them from multiple sensor measurements. This is formulated as an inverse problem in the feature coefficients. Once the coefficients are estimated they may be used to derive higher level features used by machine...
Plaque composition analysis is a critical tool in identifying vulnerable atherosclerotic plaques. Intravascular ultrasound with spectral analysis of the backscattered radio frequency (RF) signals (IVUS-VH) is currently considered as the gold standard for the evaluation of coronary plaque composition, while CT coronary angiography (CTA) has been proposed as a potential non-invasive counterpart. In...
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