Update VertiGo – light affection of mobile VNG

2021 ◽  
Vol 7 (1) ◽  
pp. 140-144
Author(s):  
Sophia Reinhardt ◽  
Joshua Schmidt ◽  
Michael Leuschel ◽  
Christiane Schüle ◽  
Jörg Schipper
Keyword(s):  
Computer Vision ◽  
Light Source ◽  
Clinical Application ◽  
The Self ◽  
History Taking ◽  
Proof Of Concept ◽  
Vestibular Nystagmus ◽  
Lighting Conditions ◽  
Recorded Data ◽  
External Light Source

Abstract Dizziness is one of the most frequent symptoms in outpatient practices. For the differentiation of peripheral or central pathogenesis of vertigo, history taking and clinical examination with the detection of nystagmus is elementary. The aim of this study was to investigate the effect of lighting for the detection of horizontal vestibular nystagmus while utilizing a conventional webcam. In the proof-of-concept study, caloric induced vestibular nystagmus was recorded with a conventional video-nystagmography and mobile webcam in addition to an external light source. The analysis of recorded data was performed with a self-developed software using computer vision techniques. The self-designed algorithm detected the existence of nystagmus and its direction in several cases. The experimental webcam-based vestibular nystagmography could be enhanced by improving lighting conditions. Currently, a clinical application for this technique is not approved. Further software improvements are necessary to increase its accuracy.

scholarly journals VertiGo – a pilot project in nystagmus detection via webcam

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Sophia Reinhardt ◽  
Joshua Schmidt ◽  
Michael Leuschel ◽  
Christiane Schüle ◽  
Jörg Schipper
Keyword(s):  
Computer Vision ◽  
Clinical Application ◽  
Feasibility Study ◽  
Clinical Examination ◽  
Pilot Project ◽  
Vestibular Nystagmus ◽  
Central Origin ◽  
Recorded Data

AbstractDizziness is one of the most common symptoms in medicine. For differentiation of peripheral or central origin of the vertigo, history and clinical examination with detection of a nystagmus is essential. The aim of this study was to detect horizontal vestibular nystagmus utilizing a webcam. In the feasibility study, caloric induced vestibular nystagmus was recorded with conventional video-nystagmography and webcam. Analysis of recorded data was performed with a developed software which used computer vision techniques. A designed algorithm detected nystagmus existence and their direction. The software was evaluated by an expert-rated video-nystagmography. Webcam-based vestibular nystagmus detection is possible. Currently, a clinical application is not approved. Further software improvements are necessary to increase its accuracy.

scholarly journals Reconstruction Lighting Positions of a Scene for Mixed Reality Systems Using Convolutional Neural Network and Shadow Ray Tracing

2021 ◽  
pp. 1-18
Author(s):  
Maxim Igorevich Sorokin ◽  
Dmitry Dmitrievich Zhdanov ◽  
Ildar Vagizovich Valiev
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Computer Vision ◽  
Ray Tracing ◽  
Light Source ◽  
Virtual Worlds ◽  
Mixed Reality ◽  
The Real ◽  
Virtual Objects ◽  
Lighting Conditions

The paper examines the causes of visual discomfort in mixed reality systems and algorithmic solutions that eliminate one of the main causes of discomfort, namely, the mismatch between the lighting conditions of objects in the real and virtual worlds. To eliminate this cause of discomfort, the algorithm is proposed, which consists in constructing groups of shadow rays from points on the boundaries of shadows to points on the boundaries of objects. Part of the rays corresponding to the real lighting conditions form caustics in area of the real light source, which makes it possible to determine the source of illumination of virtual objects for their correct embedding into the mixed reality system. Convolutional neural networks and computer vision algorithms were used to classify shadows in the image. Examples of reconstructing the coordinates of a light source from RGBD data are presented.

Developing Algorithms for a Berry Recognition System Used in Robotized Harvesting of Garden Strawberry

2020 ◽  
Vol 67 (1) ◽  
pp. 133-141
Author(s):  
Dmitriy O. Khort ◽  
Aleksei I. Kutyrev ◽  
Igor G. Smirnov ◽  
Rostislav A. Filippov ◽  
Roman V. Vershinin
Keyword(s):  
Computer Vision ◽  
Technological Process ◽  
Degrees Of Freedom ◽  
Computer Control ◽  
Recognition System ◽  
Raspberry Pi ◽  
Laser Sensors ◽  
Lighting Conditions ◽  
Systems Research ◽  
Degree Of Maturity

Technological capabilities of agricultural units cannot be optimally used without extensive automation of production processes and the use of advanced computer control systems. (Research purpose) To develop an algorithm for recognizing the coordinates of the location and ripeness of garden strawberries in different lighting conditions and describe the technological process of its harvesting in field conditions using a robotic actuator mounted on a self-propelled platform. (Materials and methods) The authors have developed a self-propelled platform with an automatic actuator for harvesting garden strawberry, which includes an actuator with six degrees of freedom, a co-axial gripper, mg966r servos, a PCA9685 controller, a Logitech HD C270 computer vision camera, a single-board Raspberry Pi 3 Model B+ computer, VL53L0X laser sensors, a SZBK07 300W voltage regulator, a Hubsan X4 Pro H109S Li-polymer battery. (Results and discussion) Using the Python programming language 3.7.2, the authors have developed a control algorithm for the automatic actuator, including operations to determine the X and Y coordinates of berries, their degree of maturity, as well as to calculate the distance to berries. It has been found that the effectiveness of detecting berries, their area and boundaries with a camera and the OpenCV library at the illumination of 300 Lux reaches 94.6 percent’s. With an increase in the robotic platform speed to 1.5 kilometre per hour and at the illumination of 300 Lux, the average area of the recognized berries decreased by 9 percent’s to 95.1 square centimeter, at the illumination of 200 Lux, the area of recognized berries decreased by 17.8 percent’s to 88 square centimeter, and at the illumination of 100 Lux, the area of recognized berries decreased by 36.4 percent’s to 76 square centimeter as compared to the real area of berries. (Conclusions) The authors have provided rationale for the technological process and developed an algorithm for harvesting garden strawberry using a robotic actuator mounted on a self-propelled platform. It has been proved that lighting conditions have a significant impact on the determination of the area, boundaries and ripeness of berries using a computer vision camera.

Otoscopy and Photography

1979 ◽  
Vol 88 (6) ◽  
pp. 771-773 ◽  
Author(s):  
Benjamin Chen ◽  
Terry L. Fry ◽  
Newton D. Fischer
Keyword(s):  
Light Source ◽  
Clinical Application ◽  
Middle Ear ◽  
Optical System ◽  
Strobe Light ◽  
System A ◽  
The Subject ◽  
Ear Canals ◽  
Light Color ◽  
Otoscopic Examination

A new hand-held otoscope photographic system, convenient and suitable for clinical application, is introduced. This instrument allows clear otoscopic examination in stenotic or tortuous ear canals, and photographs the subject in one procedure. The instrument consists of a rodlens optical system, a fiberoptic light source, a camera, and exchangeable speculum and a strobe light. Color photographs of tympanic membranes and middle ear pathology are presented.

Means to improve light source productivity: from proof of concept to field implementation

2016 ◽  
Author(s):  
E. Rausa ◽  
T. Cacouris ◽  
W. Conley ◽  
M. Jackson ◽  
S. Luo ◽  
...  
Keyword(s):  
Light Source ◽  
Proof Of Concept

scholarly journals Design of a Long-Pass Filter with Effects on Fluorescence Image Observation for Surgical Fluorescence Microscope Applications

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1571
Author(s):  
Jinkyu Kim ◽  
Kicheol Yoon ◽  
Kwanggi Kim
Keyword(s):  
Blood Vessels ◽  
Light Source ◽  
Oncological Surgery ◽  
Tumor Removal ◽  
Diagnostic Image ◽  
Pass Filter ◽  
Fluorescence Image ◽  
Surgical Microscope ◽  
External Light Source

The goal of oncological surgery is to completely remove the tumor. Tumors are often difficult to observe with the naked eye because of the presence of numerous blood vessels and the fact the colors of the tumor and blood vessels are similar. Therefore, a fluorescent contrast medium using a surgical microscope is used to observe the removal status of the tumor. To observe the tumor removal status using a fluorescent contrast agent, fluorescence is expressed in the tumor by irradiating with an external light source, and the expressed tumor can be confirmed through a surgical microscope. However, not only fluorescence-expressed tumors are observed under a surgical microscope, but images from an external light source are also mixed and observed. Therefore, since the surgical microscope is connected to a filter, the quality of the diagnostic image is not uniform, and it is difficult to achieve a clear observation. As a result, an asymmetric image quality phenomenon occurs in the diagnostic images. In this paper, a filter with high clarity that provides a symmetrical observation of diagnostic images is developed and manufactured.

VISUAL EFFECTS OF OBJECTS UNDER METAMERISM WITH MULTI-SPECTRAL LIGHT SOURCE

2021 ◽  
Author(s):  
Y.M. Li ◽  
H. Fan ◽  
C.H. Lin ◽  
J.U. Chong ◽  
T.X. Lee
Keyword(s):  
Light Source ◽  
Positive Relationship ◽  
Target Object ◽  
Visual Effects ◽  
Colour Temperature ◽  
Lighting Conditions ◽  
The Future ◽  
Convenience Sampling ◽  
Colour Rendering

This study attempts to simulate the metamerism colour, and the guava was used as the target object. We design four sets of metamers with a correlated colour temperature of 4000K and an illuminance of 750lux. The light source was simulated in the LED cube. The subjects with convenience sampling observed the visual effects, including look delicious, colourful, and colour rendering of guava under metamerism, then analysed its relationship with CRI and CQS. The results showed that colour rendering and visual effects are not a positive relationship, and the effect of CQS is closer to the visual effects of the subjects. The results of this study can be used as a reference for light source lighting designers as a basis for improving lighting conditions. In the future, we can collect databases for the different objects with an optimized multi-spectral light source.

Effect Of Chromaticity Of Surrounding Light Sources on Mesopic Adaptation Luminance

2021 ◽  
pp. 30-38
Author(s):  
Sangita Sahana ◽  
Biswanath Roy
Keyword(s):  
Light Source ◽  
The State ◽  
Light Sources ◽  
Ambient Light ◽  
Lighting Conditions

This paper presents variations in mesopic adaptation luminance in the presence of ambient light sources along with main light source for outdoor lighting applications. Mesopic photometry system is based on peripheral task, and adaptation luminance is required to compute the effective mesopic radiance for the measured area. Different lighting conditions were considered to determine the effect of chromaticity of bright surrounding sources other than the main light sources to the state of observer adaptation. The veiling luminance caused by the surrounding sources increases the state of observer adaptation, but not the luminance within the measurement field. It has also been observed that in case of cool white surrounding sources, adaptation luminance increases significantly than that of warm white sources.

scholarly journals Association between Poor Ergophthalmologic Practices and Computer Vision Syndrome among University Administrative Staff in Ghana

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Samuel Bert Boadi-Kusi ◽  
Sampson Listowell Abu ◽  
George Oppong Acheampong ◽  
Peter Osei-Wusu Adueming ◽  
Emmanuel Kwasi Abu
Keyword(s):  
Computer Vision ◽  
Health Examination ◽  
Administrative Staff ◽  
Cape Coast ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Lighting Conditions ◽  
Computer Vision Syndrome ◽  
Computer Workstation ◽  
The University

Aim. The aim of this study was to assess the prevalence of computer vision syndrome (CVS) and its associated ergonomic factors among university administrative staff in Ghana. Methods. A cross-sectional survey was conducted among 200 administrative staff of the University of Cape Coast. The procedure included a self-administered questionnaire, comprehensive ocular health examination, and assessment of computer workstation and lighting conditions. The prevalence of CVS among the subjects and the association between CVS and ergonomic practices were determined. Results. The mean age of the study sample was 31.0 ± 4.7 years, and the majority were males (56.0%). The prevalence of CVS was among 103 (51.5%)participants. Over a third of the respondents used computers for 6 or more hours daily. Significant association was found between CVS and poor ergonomic practices (χ = 15.175, p=0.001). Conclusion. In addition to poor ergonomic office setup, university administrative staff spend several hours behind computer screens leading to the development of CVS. Increased awareness of CVS and adherence to recommended ergonomic practices are necessary to reduce the prevalence of CVS and ultimately enhance work satisfaction and productivity.

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