The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
At present, registration of the Large size Very High Resolution (VHR) images is one of the important task in remote image analysis. However, until now, it is still rare to find an accurate and robust image registration method, and most of the existing methods are designed for small size images. Among the most popular methods, SIFT is performed well to register VHR images but the calculation procedure...
Two-dimensional forward-looking sonars such as Blueview or DIDSON are becoming a standard sensor in both remotely-operated and autonomous underwater vehicles. Registration of imagery obtained from this sensors is of great interest since it constitutes a key step in several applications like the generation of acoustic mosaics or the extraction of vehicle motion estimates from sonar imagery, specially...
Synthetic Aperture Radar systems are powerful observation tools for maritime surveillance applications such as fisheries monitoring or pirates detection and oil slick detection. It is an important problem that has not been completely solved. In order to perform those detections, a search area is needed. In this paper, several segmentation techniques are proposed and compared to give rise to the search...
The aim of this study is to simulate the pareidolia capability of humans to produce an emotional response to a scene using analysis of facial expressions associated with abstract face-like patterns. We developed a system that uses a holistic face detector and a facial expression classifier. The υ and SVDD One-Class Support Vector Machines (SVM) were evaluated for creating a holistic face detector,...
Real-world scenes involve many objects that interact with each other in complex semantic patterns. For example, a bar scene can be naturally described as having a variable number of chairs of similar size, close to each other and aligned horizontally. This high-level interpretation of a scene relies on semantically meaningful entities and is most generally described using relational representations...
Using the methods of the information theory, we derive the fundamental limit to the resolution of optical imaging, and demonstrate that in the far-field, contrary to the conventional wisdom, it is not equal or close to one half of the wavelength.
The speed of face detection influences overall performance of applications like face recognition and human-robot interaction (HRI). In some applications such as long distance HRI, face detection is carried out on high resolution image up to 800×600 or more, leading to an increase in detection time and, in turn, deteriorating the application performance. To improve the speed of face detection, we propose...
We demonstrate a method for encoding spatial information across a line cursor using chirped amplitude modulation for application to one-dimensional multiphoton microscopy using a single-element detector. Resolution, along with imaging speed and quality, will be discussed.
The need for a combination of a number of observation and analytical methods in a single instrument minimizes the time consuming moving of the studied sample among several devices for different applications and avoids the navigation to the studied object with features in nanometer dimensions. The high-resolution Schottky FE SEM and Ga FIB that allow imaging in different signals were combined with...
This paper introduces a mapping method for adding a coarse grain (multiple pixels per processor) processing mode to massively parallel cellular processor arrays. The main motivation is to provide the fine grain pixel-parallel processor array with the ability of processing images with higher resolution than the array itself, in a way that is transparent to the programmer. The proposed method accomplishes...
Accuracy in image object detection has been usually achieved at the expense of much computational load. Therefore a trade-off between detection performance and fast execution commonly represents the ultimate goal of an object detector in real life applications. In this present work, we propose a novel method toward that goal. The proposed method was grounded on a multi-scale spectral residual (MSR)...
Scale invariant feature detectors often find stable scales in only a few image pixels. Consequently, methods for feature matching typically choose one of two extreme options: matching a sparse set of scale invariant features, or dense matching using arbitrary scales. In this paper we turn our attention to the overwhelming majority of pixels, those where stable scales are not found by standard techniques...
Although the scale of isotropic visual elements such as blobs and interest points, e.g. SIFT[12], has been well studied and adopted in various applications, how to determine the scale of anisotropic elements such as edges is still an open problem. In this paper, we study the scale of edges, and try to answer two questions: 1) what is the scale of edges, and 2) how to calculate it. From the points...
This paper assesses the implementation of scale-and rotation-invariant feature detectors on Cellular Processor Arrays (CPA). Scale- and rotation-invariant feature detectors are complex image processing algorithms with a high computational burden in the low-level image processing stage due to large-neighborhood convolution-type operations. Such operations are used to generate the so-called scale-space...
Super-resolution localization microscopy methods such as PALM and STORM have been shown to provide imaging with resolutions up to a few tens of nanometers while using relatively simple setups. Biplane PALM has extended the PALM technique to three-dimensions, by simultaneously using two imaging planes, with different focal depths. A key aspect in achieving good axial localization results is the alignment...
In this paper we present a technique for real-time face logging in video streams. Our system is capable of detecting faces across a range of poses and of tracking multiple targets in real time, grabbing face images and evaluating their quality in order to store only the best for each detected target. An advantage of our approach is that we qualify every logged face in terms of a quality measure based...
The vertical-objective-based ellipsometric microscope (VEM) is presented which can be used for real-time visualization of nm-thick lubricant films with high lateral resolution. The performance of hard disk drives (HDDs) depends on the dynamics of the nm-thick liquid lubricant films due to decrease of head-disk gap to 2 to 3 nm. The contact or near-contact head disk interface is needed to increase...
The optical parameters of millimeter wavelength (MMW) imaging system are under investigation in this study. The Optical Transfer Function (OTF) was measured and simulated in this study. The performance and quality of the MMW imaging system were tested using point source objects and Point Spread Function (PSF) was obtained. The MMW imaging system is composed of large aperture 500 mm spherical mirror,...
We describe a method of interpolation for a pixellated γ-radiation detector made of cadmium zinc telluride (CZT) with the goal to optimize its intrinsic spatial resolution. A similar method is known from silicon strip sensors where the interpolation improves the intrinsic spatial resolution over the single-strip digital resolution.
We present an initial evaluation of a mechanically-cooled, high-purity germanium double-sided strip detector as a potential gamma camera for small-animal SPECT. It is 90 mm in diameter and 10 mm thick with two sets of 16 orthogonal strips that have a 4.75 mm width with a 5 mm pitch. A sub-strip interpolation method is used to bin the data at a pixel size of 0.53mm × 0.53mm, while it is also possible...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.