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For applications in navigation and robotics, estimating the 3D pose of objects is as important as detection. Many approaches to pose estimation rely on detecting or tracking parts or keypoints [11, 21]. In this paper we build on a recent state-of-the-art convolutional network for slidingwindow detection [10] to provide detection and rough pose estimation in a single shot, without intermediate stages...
A new algorithm based in Crεmε Filter, is presented for breast cancer detection. The images obtained show micro calcifications with better contrast, allowing a better detection of cancer. The filter has only one parameter that permitting to observe texture when parameter is changed.
We have developed a method to restore the image obtained by the pinhole camera, which allows to increase the angular resolution by about 3-4 times and to obtain uniform sensitivity in the all field of view without a noticeable increase in noise in the gamma-ray image. The method is based on the use of the inverse problem solution for finding the distribution of incident photons with the measured apparatus...
The benefit of time-of-flight (TOF) in PET reconstruction has been established for clinical imaging, and the signal-to-noise benefit with TOF has been demonstrated to increase with higher randoms fractions. TOF information mitigates and reduces image artifacts arising from errors in the corrections, but it may not account for all changes with count rate. Standard performance measures of image quality...
The probe arrangement in positron emission tomography (PET) is a combination of a high resolution detector (probe) placed within a whole body PET scanner. An additional subset of high-resolution data is recorded that contains events where one of the annihilation photon pair interacted in the high resolution detector. A study was designed to evaluate impact of probe geometry and efficiency on the quality...
In this work, a direct image reconstruction algorithm for PET is proposed. This method follows naturally from the concept of LOR, and easily admits depth of interaction and time of flight information. In addition, this algorithm does not require the computation of sinograms or a system matrix. Thus, it is not restricted in the formation of high pixel density images and allows the image formation in...
We consider the special treatment of the gamma-ray images obtained by a portable gamma cameras with detector Medipix. The processing of gamma images was conducted to improve the angular resolution using the developed iterative method. The elimination of muon tracks in the shadow patterns to increase the sensitivity was considered also.
In the FP7 project CONSORTIS, a dual-band passive imager is being developed for security applications. The latter is based on bolometer based kinetic inductance detectors operating at two frequency bands to improve the collection of thermal information. These bolometric detectors rely on a frequency selective absorber (FSA) to achieve the two bands. In this contribution, we describe the optimization...
Detecting eyes in images is fundamental for many computer vision applications including face detection, face recognition, and human-computer interaction. Most existing methods are designed and tested on datasets acquired under controlled lab settings (e.g., fixed scale, known poses, clean background, etc.), leaving their performance to be further examined on real-world, uncontrolled images, such as...
In this paper, we present a method for affine invariant feature description. Based on the gradient distribution of an image region we calculate two basis vectors defining an affine invariant coordinate system, used to normalize the image region. The estimated basis vectors are non-orthogonal and allow for a precise representation of the gradient distribution. The proposed method can be combined with...
Research on pedestrian detection still presents a lot of space for improvements, both on speed and detection accuracy. State-of-the-art object proposals approach has shown the very effective computational efficiency in object detection. In this paper, we present a framework for pedestrian detection based on the object proposals. Instead of scaling the test image to different sizes, we generate a pyramid...
The proposal of new edge detectors is a constant in last years due to the importance of the edge detection result for high-level image processing tasks. It is known that there is no optimal edge detector for all kinds of images and in addition, it is not a straightforward mission to set the optimal set of parameters of the edge detector for each image. In this paper, an algorithm to deal with these...
The new advanced very high resolution (VHR) synthetic aperture radar (SAR) sensors are capable of achieving sub-meter resolution, which offers the opportunity for a fine level of analysis of man-made structures. In this paper, we present a method for the detection and 2-D reconstruction of building radar footprints from VHR SAR scenes. The method is based on the extraction of a set of low-level features...
A new threshold template algorithm is presented in this paper to improve the performance in ship detection in high-resolution synthetic aperture radar (SAR) images. The algorithm introduces SAR formation theories into detection. First, we divide the image into tiles within which the sea background can be treated as homogeneous one. Second, we use a threshold template method to detect candidate ship...
A license plate detection task (LPD) is an important stage in the License plate recognition (LPR) implementations for automated transport systems. This paper is focused on a theory behind various interest points (IPs) detectors and region descriptors often used in applications of image processing including the LPR apps among others. We have carried out wide analysis on behaviour of several selected...
We present, for the first time, a phase-sensitive 2-dimensional imaging system for THz- and mmW-band applications using a single pixel intensity-only detector and the “PhaseLift” algorithm. The complex sampling mask required for the PhaseLift procedure is implemented using a commercial LCD projector and a high-resistivity silicon wafer combined to work as a spatial light modulator harnessing the photoelectric...
This work presents the theoretical analysis of the effects of dielectric relaxation on the response of polymer piezoelectric sensors. In systems that obtain spatial information from temporal signals, such as optoacoustic tomography, the accurate characterization of transducers is very important. There are many works in the literature about reconstruction algorithms assuming ideal piezoelectric sensors...
Compton Cameras have been proposed as an alternative to SPECT imaging with Gamma Camera, mainly due to factors such as the electronic collimation, which allows a bigger field of view and provides further information from the acquired events if compared to devices with mechanical collimation. By contrast, this involves a higher amount of data to be processed. In medical devices this leads to waiting...
Silicon technologies have already been employed in state-of-the-art THz imagers. However, their optical resolution was restricted to millimeters by the diffraction limit [1,2], and THz super-resolution imagers were implemented in aperture or apertureless scanning near-field optical microscopy [3]. Such systems are limited to a single pixel with an illumination source and detector components placed...
Taking x-ray images goes back over 100 years. Since then, there have been numerous advances in x-ray technology and these have been increasingly applied in helping the manufacturing of electronic components and assemblies, as well as in their failure analysis. Most recently, this has been rapidly driven by the reduction in device and feature size and the movement to using newer, lower density materials...
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