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Amir H. Meghdadi
University of Manitoba
23Publications
8H-index
193Citations
Publications 23
Newest
Jul 26, 2019 in INTERACT (International Conference on Human-Computer Interaction)
#2Chris BerkaH-Index: 17
Last.Ajay VermaH-Index: 10
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The co-acquisition of EEG in a virtual environment (VE) would give researchers and clinicians the opportunity to acquire EEG data with millisecond-level temporal resolution while participants performed VE activities. This study integrated Advanced Brain Monitoring’s (ABM) X-24t EEG hardware with the HTC Vive VR headset and investigated EEG differences in tasks delivered in two modalities: VE and a desktop computer.
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#1Amir H. MeghdadiH-Index: 8
#2Chris BerkaH-Index: 17
Last.David H. SalatH-Index: 60
view all 7 authors...
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#2Chris BerkaH-Index: 17
Last.Thomas D. Marcotte (UCSD: University of California, San Diego)H-Index: 46
view all 10 authors...
The number of older drivers is steadily increasing, and advancing age is associated with a high rate of automobile crashes and fatalities. This can be attributed to a combination of factors including decline in sensory, motor, and cognitive functions due to natural ageing or neurodegenerative diseases such as HIV-Associated Neurocognitive Disorder (HAND). Current clinical assessment methods only modestly predict impaired driving. Thus, there is a need for inexpensive and scalable tools to predic...
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Objective: To demonstrate the utility of rheoencephalography (REG) for measuring cerebral blood flow and fluid dynamics during different stages of sleep. Methods: Anteroposterior cranial electrical impedance was measured with concurrent polysomnography in a group of healthy subjects during sleep. Transcranial electrical impedance was characterized by measuring the peak-to-trough and envelope of the filtered pulsative REG signal as well as its frequency. The sensitivity of the REG amplitude to ch...
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Abstract Introduction The objective of the study is to validate attention and memory tasks that elicit event-related potentials (ERPs) for utility as sensitive biomarkers for early dementia. Methods A 3-choice vigilance task designed to evaluate sustained attention and standard image recognition memory task designed to evaluate attention, encoding, and image recognition memory were administered with concurrent electroencephalography acquisition to elicit ERPs in mild cognitive impairment (MCI) a...
4 CitationsSource
#1Amir H. Meghdadi (UM: University of Manitoba)H-Index: 8
#2Reza Fazel-Rezai (National Research Council)H-Index: 20
Last.Y. Aghakhani (UM: University of Manitoba)H-Index: 3
view all 3 authors...
1 Citations
#1Amir H. Meghdadi (UM: University of Manitoba)H-Index: 8
#2Pourang Irani (UM: University of Manitoba)H-Index: 31
We propose a novel video visual analytics system for interactive exploration of surveillance video data. Our approach consists of providing analysts with various views of information related to moving objects in a video. To do this we first extract each object's movement path. We visualize each movement by (a) creating a single action shot image (a still image that coalesces multiple frames), (b) plotting its trajectory in a space-time cube and (c) displaying an overall timeline view of all the ...
36 CitationsSource
#1Amir H. Meghdadi (UM: University of Manitoba)H-Index: 8
#2James F. Peters (University of Hyderabad)H-Index: 34
Purpose – The purpose of this paper is to demonstrate the effectiveness and advantages of using perceptual tolerance neighbourhoods in tolerance space‐based image similarity measures and its application in content‐based image classification and retrieval.Design/methodology/approach – The proposed method in this paper is based on a set‐theoretic approach, where an image is viewed as a set of local visual elements. The method also includes a tolerance relation that detects the similarity between p...
3 CitationsSource
#1Amir H. MeghdadiH-Index: 8
#2James F. PetersH-Index: 34
This research report introduces the POINCaRe image analysis system named after Jules Henri Poincare (1854 1912). This system provides a variety of image analysis approaches and instantiates the perception of nearness between objects in a visual field. The current version of POINCaRe uses neighborhoods of visual elements (small subimages) in determining the degree of nearness of pairs of nonempty sets. With this tool, it is possible to engage in content-based image retrieval (CBIR) from a near se...
#1Amir H. Meghdadi (UM: University of Manitoba)H-Index: 8
The problem addressed in this research is how to quantify the notion of similarity between two images with the main focus on content-based image retrieval (CBIR). The main strategy used here is a Near Set approach where each image is considered as a set of visual elements that can be described with a set of visual descriptions (features). The similarity between images is then defined as the nearness between sets of elements based on their descriptions. The main contribution of this thesis, is to...
4 Citations
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