Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON - MOST Wiedzy

Wyszukiwarka

Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON

Wyniki wyszukiwania dla: TWO-PHOTON VISION, INFRARED VISION, THRESHOLD, LASER COMPARISON

  • Effects of laser pulse duration in two-photon vision threshold measurements

    Publikacja

    - Proceedings of SPIE - Rok 2021

    Pulsed near-infrared (NIR) light sources can be successfully applied for both imaging and functional testing of the human eye, as published recently1. These two groups of applications have different requirements. For imaging applications, the most preferable is invisible scanning beam while efficiently visible stimulating beam is preferable for functional testing applications. The functional testing of human eye using NIR laser...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Solid state versus fiber picosecond infrared lasers applied to two-photon vision tests

    Publikacja

    - Proceedings of SPIE - Rok 2019

    Development of new microperimetric tools dedicated for imaging of early functional changes in the retina may help in the monitoring of various ocular diseases progression e.g. Age-Related Macular Degeneration. Recently described two-photon vision may be applied to microperimetric devices. Many subjects with well-known disease history could be investigated with newly developed instrumentation that tests ability of human eye to perceive...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Towards spectral sensitivity curve for two-photon vision mechanism

    Publikacja
    • M. J. Marzejon
    • Z. Agnieszka
    • D. Stachowiak
    • G. Soboń
    • M. Wojtkowski
    • K. Katarzyna

    - Rok 2022

    Abstract Purpose: The perceived brightness of different visible light sources can be compared with photometric units based on the standardized luminosity curves (300-780nm range). As reported previously (PNAS 111(50), pp. E5445-E5454 (2014)), near-infrared (NIR) radiation can cause isomerization of visual pigments by one- or two-photon absorption. The perceived color of the stimulus is red in the case of one-photon vision (1PV)...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Femtosecond Er-doped fiber laser source tunable from 872 to 1075 nm for two-photon vision studies in humans

    Publikacja
    • D. Stachowiak
    • M. J. Marzejon
    • J. Bogusławski
    • Z. Łaszczych
    • K. Komar
    • M. Wojtkowski
    • G. Soboń

    - Biomedical Optics Express - Rok 2022

    We report the development of a widely-tunable femtosecond fiber laser system and its application for two-photon vision studies. The source is based on an Er-doped fiber laser with spectral shift up to 2150 nm, followed by a second harmonic generation module to generate a frequency-doubled beam tunable from 872 to 1075 nm. The source delivers sub-230 fs pulses with nearly-constant duration over the entire tuning range, with output...

    Pełny tekst do pobrania w portalu

  • Two-photon microperimetry with picosecond pulses

    Publikacja

    - Biomedical Optics Express - Rok 2021

    Two-photon vision is a phenomenon associated with the perception of short pulsesof near-infrared radiation (900-1200 nm) as a visible light. It is caused by the nonlinear processof two-photon absorption by visual pigments. Here we present results showing the influence ofpulse duration and repetition rate of short pulsed lasers on the visual threshold. We comparedtwo-photon sensitivity maps of the retina obtained for subjects with...

    Pełny tekst do pobrania w portalu

  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

    The aim of this paper is to present a novel method, called Adaptive Edge Detection (AED), of extraction of precise pupil edge coordinates from eye image characterized by reflections of external illuminators and laser beams. The method is used for monitoring of pupil size and position during psychophysical tests of two-photon vision performed by dedicated optical set-up. Two-photon vision is a new phenomenon of perception of short-pulsed...

    Pełny tekst do pobrania w portalu

  • Two-photon perimetry utilizing picosecond laser

    Publikacja

    - Rok 2022

    Age-related impairments are becoming more and more severe for aging societies. The sensory organ diseases are particularly troublesome as they exclude seniors from their everyday activity. Therefore, maintaining good quality eyesight is essential for normal functioning. New medical therapies help restrain age-related changes, but still, monitoring is essential to the treatment process. Humans do not have the natural ability to...

    Pełny tekst do pobrania w portalu

  • From Knowledge based Vision Systems to Cognitive Vision Systems: A Review

    Publikacja

    - Rok 2018

    Computer vision research and applications have their origins in 1960s. Limitations in computational resources inherent of that time, among other reasons, caused research to move away from artificial intelligence and generic recognition goals to accomplish simple tasks for constrained scenarios. In the past decades, the development in machine learning techniques has contributed to noteworthy progress in vision systems. However,...

    Pełny tekst do pobrania w portalu

  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Vision Zero in Poland

    Poland’s experience of road safety work is relatively short. In the early 1990s road deaths soared to a staggering 8000 a year. A diagnosis found that Poland’s lack of systemic road safety action was to blame for those figures. In response, the state set up road safety bodies and commissioned road safety programs. In 2005, Poland followed the example of Sweden and adopted Vision Zero as a far-reaching concept of changes in road...

    Pełny tekst do pobrania w portalu

  • MACHINE VISION DETECTION OF THE CIRCULAR SAW VIBRATIONS

    Publikacja

    Dynamical properties of rotating circular saw blades are crucial for both production quality and personnel safety. This paper presents a novel method for monitoring circular saw vibrations and deviations. A machine vision system uses a camera and a laser line projected on the saw’s surface to estimate vibration range. Changes of the dynamic behaviour of the saw were measured as a function of the rotational speed. The critical rotational...

    Pełny tekst do pobrania w portalu

  • In vivo imaging of the human eye using a two-photon excited fluorescence scanning laser ophthalmoscope

    Publikacja
    • J. Boguslawski
    • G. Palczewska
    • S. Tomczewski
    • J. Milkiewicz
    • P. Kasprzycki
    • D. Stachowiak
    • K. Komar
    • M. J. Marzejon
    • B. L. Sikorski
    • A. Hudzikowski... i 6 innych

    - JOURNAL OF CLINICAL INVESTIGATION - Rok 2022

    BACKGROUND. Noninvasive assessment of metabolic processes that sustain regeneration of human retinal visual pigments (visual cycle) is essential to improve ophthalmic diagnostics and to accelerate development of new treatments to counter retinal diseases. Fluorescent vitamin A derivatives, which are the chemical intermediates of these processes, are highly sensitive to UV light; thus, safe analyses of these processes in humans...

    Pełny tekst do pobrania w portalu

  • Polish Experience of Implementing Vision Zero

    Purpose of Review The aim of this study is to present an outline and the principles of Poland’s road safety strategic programming as it has developed over the last 25 years since the first Integrated Road Safety System with a strong focus on Sweden’s “Vision Zero”. Recent Findings Countries that have successfully improved road safety have done so by following strategies centred around the idea that people are not infallible and...

    Pełny tekst do pobrania w portalu

  • New applications of sound and vision engineering

    Publikacja

    - Rok 2019

    Multimedia, Sound & Vision Engineering are relatively new fields within the area of science and technology, but teaching and research in this area has been carried out at Gdansk University of Technology (Gdansk, Poland) for nearly 5 decades. Current project carried-out in the Multimedia Systems Department are in the scope of the paper.

    Pełny tekst do pobrania w serwisie zewnętrznym

  • An Analysis of Uncertainty and Robustness of Waterjet Machine Positioning Vision System

    Publikacja

    The paper presents a new Automatic Waterjet Positioning Vision System (AWPVS) and investigates components of workpiece positioning accuracy. The main purpose of AWPVS is to precisely identify the position and rotation of a workpiece placed on a waterjet machine table. Two webcams form a basis for the system, and constitute its characteristics. The proposed algorithm comprises various image processing techniques to assure a required...

    Pełny tekst do pobrania w portalu

  • Vision-based motion analysis of kitesurfer

    Publikacja

    - Vibroengineering Procedia - Rok 2015

    Kitesurfing is a relatively recent phenomenon with raising popularity worldwide – a recently developed extreme water sport considered a high-risk injury sport. It combines elements of several other sports, in particular sailing, surfing, windsurfing, wakeboarding, and snowboarding. The main purpose of authors’ research in the present paper is to use a vision system technique for measuring a kitesurfer’s body movements in order...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • CMOS realisation of analogue processor for early vision processing

    The architecture concept of a high-speed low-power analogue vision chip, which performs low-level real-time image algorithms ispresented. The proof-of-concept prototype vision chip containing 32 × 32 photosensor array and 32 analogue processors is fabricated usinga 0.35 μm CMOS technology. The prototype can be configured to register and process images with very high speed, reaching 2000 framesper second, or achieve very low power...

    Pełny tekst do pobrania w portalu

  • Binocular Vision Impairments Therapy Supported By Contactless Eye-gaze Tracking System

    Binocular vision impairments often result in partial or total loss of stereoscopic vision. The lack of binocular vision is a serious vision impairment that deserves more attention. Very important result of the binocular vision impairments is a binocular depth perception. This paper describes also a concept of a measurement and therapy system for the binocular vision impairments by using eye-gaze tracking system.

  • Conditions and capacity for implementing Poland’s vision zero

    Since 1991 Poland has been systematically reducing its traffic hazard. Despite considerable progress Poland is still among the most dangerous countries in the European Union. The key types of actions that help to reduce fatalities include enhancement of pedestrian safety, reducing the number of speeding drivers and eliminating or reducing hazard on the road. The paper presents a brief diagnosis of the state of road safety in Poland...

    Pełny tekst do pobrania w portalu

  • Protection of Pedestrians as the Key Action for Implementing - Poland’s Vision Zero

    Publikacja

    - Rok 2015

    WHO reports show that pedestrians account for 10 to 70% of total road crash fatalities. In Poland, pedestrians also represent a significant road safety problem. For many years, pedestrian collisions have accounted for approx. 30% of total road crashes with more than 30% of pedestrians killed. Therefore, pedestrian safety has been one of Poland’s main objectives in its road safety programs implemented over the past 20 years. The...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Vision

    Czasopisma

    ISSN: 0972-2629 , eISSN: 2249-5304

  • Vision

    Czasopisma

    eISSN: 2411-5150

  • RF Indoor Positioning System Supported by Wireless Computer Vision Sensors

    In this paper the possibility of increase the accuracy of RF fingerprinting indoor tracking system by the use of additional information from simple vision system is examined. As the distances in signal space differs from ones in real environment the ambiguity in decision process of fingerprinting algorithm can occur when set of closest distances between tag and map points in signal space corresponds to big distances differences...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • A Finer Point on Vision

    As an IES Member, I look forward to each issue of LD+A and read them with great interest as they are often very informative. To my surprise, the Research article (May 2019, p. 76) has an error which should be corrected.

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Remote sensing in laboratory diagnostics of reinforced concrete elements – current development and vision for the future

    Publikacja

    - Rok 2015

    Continuous emergence of new concrete types and kinds of reinforcement, as well as technological solutions in the field of structural engineering have made great demand for diagnostic tests of reinforced concrete elements. New challenges and problems facing people require new more efficient tools for laboratory diagnostics than those commonly used. Remote sensing may be the answer to this demand. In this paper the author describes...

  • Remote sensing in laboratory diagnostics of reinforced concrete elements – current development and vision for the future

    Continuous emergence of new concrete types and kinds of reinforcement, as well as technological solutions in the field of structural engineering have made great demand for diagnostic tests of reinforced concrete elements. New challenges and problems facing people require new more efficient tools for laboratory diagnostics than those commonly used. Remote sensing may be the answer to this demand. In this paper the author describes...

    Pełny tekst do pobrania w portalu

  • A VISION-BASED UNMANNED AERIAL VEHICLE NAVIGATION METHOD

    The satellite navigation systems are the main position sources for unmanned aerial vehicles (UAVs). This fact limits the area of UAVs operation to the places where radio signals is visible for a satellite navigation system receiver, mounted on the vehicle-outdoor navigation. Closed spaced are unavailable for vehicles which navigation is based on global satellite navigation systems (GNSS). Miniature UAV (MiniUAV) is able to operate...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • The Influence of Camera and Optical System Parameters on the Uncertainty of Object Location Measurement in Vision Systems

    The article presents the influence of the camera and its optical system on the uncertainty of object position measurement in vision systems. The aim of the article is to present the methodology for estimating the combined standard uncertainty of measuring the object position with a vision camera treated as a measuring device. The identification of factors affecting the location measurement uncertainty and the determination of their...

    Pełny tekst do pobrania w portalu

  • Hazard Control in Industrial Environments: A Knowledge-Vision-Based Approach

    Publikacja

    This paper proposes the integration of image processing techniques (such as image segmentation, feature extraction and selection) and a knowledge representation approach in a framework for the development of an automatic system able to identify, in real time, unsafe activities in industrial environments. In this framework, the visual information (feature extraction) acquired from video-camera images and other context based gathered...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Video Semantic Analysis Framework based on Run-time Production Rules - Towards Cognitive Vision

    Publikacja

    This paper proposes a service-oriented architecture for video analysis which separates object detection from event recognition. Our aim is to introduce new tools to be considered in the pathway towards Cognitive Vision as a support for classical Computer Vision techniques that have been broadly used by the scientific community. In the article, we particularly focus in solving some of the reported scalability issues found in current...

    Pełny tekst do pobrania w portalu

  • 2015. Motion analysis of a kitesurfer employing a vision-based measurement system

    Publikacja

    - Journal of Vibroengineering - Rok 2016

    Abstract. Kitesurfing is a relatively new phenomenon with rising popularity worldwide – a recently developed extreme watersport considered a high-risk injury sport. It combines elements of several other sports, in particular, sailing, surfing, windsurfing, wakeboarding, and snowboarding. The main purpose of authors’ research in the present paper is to use a vision-based system for measuring a kitesurfer’s body movements in order...

    Pełny tekst do pobrania w portalu

  • Visual Content Learning in a Cognitive Vision Platform for Hazard Control (CVP-HC)

    Publikacja

    - CYBERNETICS AND SYSTEMS - Rok 2019

    This work is part of an effort for the development of a Cognitive Vision Platform for Hazard Control (CVP-HC) for applications in industrial workplaces, adaptable to a wide range of environments. The paper focuses on hazards resulted from the nonuse of personal protective equipment (PPE). Given the results of previous analysis of supervised techniques for the problem of classification of a few PPE (boots, hard hats, and gloves...

    Pełny tekst do pobrania w portalu

  • Contextual Knowledge to Enhance Workplace Hazard Recognition and Interpretation in a Cognitive Vision Platform

    Publikacja

    - Rok 2018

    The combination of vision and sensor data together with the resulting necessity for formal representations builds a central component of an autonomous Cyber Physical System for detection and tracking of laborers in workplaces environments. This system must be adaptable and perceive the environment as automatically as possible, performing in a variety of plants and scenes without the necessity of recoding the application for each...

    Pełny tekst do pobrania w portalu

  • Stereo vision with Equal Baseline Multiple Camera Set (EBMCS) for obtaining depth maps of plants

    This paper presents a method of improving the estimation of distances between an autonomous harvesting robot and plants with ripe fruits by using the vision system based on five cameras. The system is called Equal Baseline Multiple Camera Set (EBMCS). EBMCS has some features of a camera matrix and a camera array. EBMCS is regarded as a set of stereo cameras for estimating distances by obtaining disparity maps and depth maps. This...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Method for universal detection of two-photon polarization entanglement

    Publikacja
    • K. Bartkiewicz
    • P. Horodecki
    • K. Lemr
    • A. Miranowicz
    • K. Życzkowski

    - PHYSICAL REVIEW A - Rok 2015

    Detecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing. Surprisingly, no direct (i.e., without quantum tomography) universal experimental implementation of a necessary and sufficient test of entanglement has been designed even for a general two-qubit state. Here we propose an experimental method for detecting a collective universal...

    Pełny tekst do pobrania w portalu

  • Vision guided robot gripping systems

    Publikacja

    W rozdziale omawia się robotycki system wykorzystujący kamery streo. System taki zastępuje pracę człowieka przy przenoszeniu obiektów wielkowymiarowych (teoretycznie nieograniczonych) w przestrzeni trójwymiarowej. W rozważaniach uwzględniono pinholową kamerę (bezsoczewkową z bardzo małą aperturą/otworem) oraz prosty model zniekształcenia soczewkowego. Podano wartości poszczególnych parametrów. Zastosowano dwie konwencje notacyjne...

  • Erosion of privacy in computer vision systems

    W pracy przedstawiono problemy, które mogą wystąpić, gdy technologia komputerowego wzroku zostanie zaimplementowana w urządzeniach wykorzystywanych w codziennym życiu. Przeprowadzono także dyskusję socjologicznych konsekwencji stosowania biometrii, automatycznego śledzenia ruchu i interpretacji obrazu. Omówiono też problemy wynikające z połączenia komputerowego wzroku z możliwościami oferowanymi przez Internet.

  • Infrared and Laser Engineering

    Czasopisma

    ISSN: 1007-2276

  • VISION RESEARCH

    Czasopisma

    ISSN: 0042-6989 , eISSN: 1878-5646

  • Science Vision

    Czasopisma

    ISSN: 0975-6175

  • Eye and Vision

    Czasopisma

    ISSN: 2326-0254

  • Vision Gerencial

    Czasopisma

    ISSN: 2477-9547 , eISSN: 1317-8822

  • JOURNAL OF VISION

    Czasopisma

    ISSN: 1534-7362

  • MOLECULAR VISION

    Czasopisma

    ISSN: 1090-0535

  • SPATIAL VISION

    Czasopisma

    ISSN: 0169-1015

  • Two-photon double ionization of atoms in attosecond x-ray radiation fields

    Publikacja

    - PHYSICAL REVIEW A - Rok 2010

    We consider two-photon double ionization of helium with 100, 200, and 400 eV excess energy for the two ejected electrons, corresponding to photon energies of 89.5, 139.5, and 239.5 eV, respectively. We focus on the case of ultrashort pulses (two oscillations of the field) and develop an approach to calculate the two-photon transition matrix elements within the lowest order of the time-dependent perturbation theory. One of the...

    Pełny tekst do pobrania w portalu

  • 3D Vision System for a Robotic Arm Based on Equal Baseline Camera Array

    This paper presents a lightweight 3D vision system called Equal Baseline Camera Array (EBCA). EBCA can work in different light conditions and it can be applied for measuring large range of distances. The system is a useful alternative to other known distance measuring devices such as structured-light 3D scanners, time-of-flight cameras, Light Detection and Ranging (LIDAR) devices and structure from motion techniques. EBCA can be...

    Pełny tekst do pobrania w portalu

  • A commonly-accessible toolchain for live streaming music events with higher-order ambisonic audio and 4k 360 vision

    Publikacja

    - Rok 2023

    An immersive live stream is especially interesting in the ongoing development of telepresence tools, especially in the virtual reality (VR) or mixed reality (MR) domain. This paper explores the remote and immersive way of enabling telepresence for the audience to high-fidelity music performance using freely-available and easily-accessible tools. A functional VR live-streaming toolchain, comprising 360 vision and higher-order ambisonic...

    Pełny tekst do pobrania w portalu

  • Towards Knowledge Formalization and Sharing in a Cognitive Vision Platform for Hazard Control (CVP-HC)

    Publikacja

    - Rok 2019

    Hazards are present in all workplaces and can result in serious injuries, short and long-term illnesses, or death. In this context, management of safety is essential to ensure the occupational health of workers. Aiming to assist the safety manage-ment process, especially in industrial environments, a Cognitive Vision Platform for Hazard Control (CVP-HC) has been proposed. The CVP-HC is a scalable yet adaptable system capable of...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Applications of knowledge technologies to sound and vision engineering

    Publikacja

    - Rok 2006

    Specjalność Inżynieria Dźwięku i Obrazu jest ukierunkowana przede wszystkim na aplikacje praktyczne metod rejestracji i przetwarzania sygnałów fonicznych i wizyjnych we współczesnej telekomunikacji i w multimediach. W związku z tym, specjalność ta wykorzystuje również wiedzę z obszaru akustyki, psychofizjologii percepcji a także estetyki muzycznej. W zastosowaniach multimedialnej technologii informatycznej w telekomunikacji, w...