Diameter Tracking
Diameter Tracking - Related Videos
11:37
Propeller Characterization: Variations in Pitch, Diameter, and Blade Number on Performance
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2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC A propeller is a twisted airfoil, where the angle of the chord changes with respect to the location, along the radial station, as shown in Figure 1. Propellers are widely used in aircraft and watercraft propulsion systems thereby necessitating detailed characterizations of propellers to design high performance vehicles. Figure 1. Chord, thickness, and pitch at a radial station. One of...
09:03
Eye Tracking Young Children with Autism
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Cited by 93 •
2012
Eye tracking has long been used to study gaze patterns in typically-developing individuals, but recent technological advancements have made its use with clinical populations, including autism, more feasible. While eye-tracking young children with autism can offer insight into early symptom manifestations, it involves methodological challenges. Suggestions for best practices are provided.
05:55
Multiple Object Tracking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
06:19
Eye Tracking in Cognitive Experiments
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2023
Eye tracking as the name suggests involves tracking of eye-movements. It is a non-invasive, sensitive tool that quantifies and measures eye-movements to describe an individuals' cognitive state. An eye-movement between two fixation points is called a saccade, which is one of the fastest motor movements in our body. By observing the profiles of these eye movements, scientists can better understand neural deficits in patients with cognitive impairments. In this video, we will first look at an...
01:17
Design Example: Calculating Safe Diameter for Wind-Exposed Disc
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2025
Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
FAQs
Diameter Tracking translates visual observations into a time-linked measurement by locating an object's boundaries and calculating the distance between opposing edges. Repeating that calculation across sequential images or video frames creates a record of width change rather than a single snapshot. Researchers can then compare trajectories across time or experimental conditions, making growth, deformation, contraction, or flow-related behavior quantitatively assessable.
The measured diameter can change as a system grows, deforms, contracts, or responds to flow. Those patterns give researchers a quantitative way to evaluate mechanical responses and structural development, while comparisons between experimental conditions can indicate treatment effects. The value lies in relating a visible change in morphology to a measurable change in system behavior.
A diameter value depends on where the two boundaries are identified. Using the same boundary logic across sequential images allows the measured distances to be compared meaningfully; changing the selected edges can make apparent differences reflect measurement choices rather than biological or mechanical change. This consistency is therefore central to reproducible analysis of dynamic bioengineering systems.
First, researchers collect sequential images or video of the system under observation. They identify the object's boundaries at each time point, calculate the distance between opposing edges, and organize those values for comparison across time or experimental conditions. The resulting series converts visual changes into quantitative data that can be used to evaluate the system's response.
The approach is applicable when a system's width changes can be observed visually over time. Examples in bioengineering include engineered tissues, blood-vessel models, microfluidic channels, and cell-based assays. In these settings, diameter measurements can support analysis of structural development, mechanical behavior, or responses to treatments, depending on the experimental question.
Researchers can compare measured widths between time points or experimental conditions to determine whether a treatment coincides with a change in system dimensions. In cell-based assays, engineered tissues, or vessel models, that comparison supplies quantitative evidence of altered morphology. It does not merely document appearance; it helps connect treatment-related structural changes with functional or mechanical interpretation.