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Fundamentals of image acquisition and imaging protocol
Published in Michael O’Byrne, Bidisha Ghosh, Franck Schoefs, Vikram Pakrashi, Image-Based Damage Assessment for Underwater Inspections, 2019
Bidisha Ghosh, Michael O’Byrne, Franck Schoefs, Vikram Pakrashi
While top-side inspections can use a tripod as a steady base, underwater photography must usually be collected with a handheld camera that is susceptible to vibrations, thus leading to blurry images, especially when shooting at slow shutter speeds as is often required in low light conditions. To partially address this problem, some modern lenses have incorporated a stabilization mechanism, although these are still far from perfect and, needless to say, it is best to have a steady hand when capturing imagery rather than relying on the lens’s image stabilization. A stabilized lens is not needed if the camera system already offers in-camera image stabilization. In such a scenario, the stabilization mechanism on either the lens or the body should be disabled to prevent conflicts.
Television Studios and Playout Facilities
Published in Skip Pizzi, Graham A. Jones, A Broadcast Engineering Tutorial for Non-Engineers, 2014
When a portable camera is required, but smooth movement akin to studio camera operation is desired, a specialized mounting system can be used that allows the handheld camera to be stabilized, through the use of gyroscopic mounts and other techniques. This approach to camera mounting is often referred to by the name of an early and popular brand of such stabilization mounts called Steadicam™, although other brands are available. Modern cameras also may provide the option of electronic image stabilization via special processing of the video signal inside the camera prior to output.
sUAS Data Accuracy in Photogrammetric Workflows
Published in J.B. Sharma, Applications of Small Unmanned Aircraft Systems, 2019
Many consumer grade cameras have image stabilization features to detect and correct camera movement during image acquisition by moving the camera lens elements. In a UAS environment, the stability of camera calibration is a prerequisite for precise photogrammetric mapping. It is recommended to disable image stabilization in UAS photography (Gillan et al. 2017).
Augmented reality and mixed reality behavior navigation system for telexistence remote assistance
Published in Advanced Robotics, 2021
Eimei Oyama, Kohei Tokoi, Ryo Suzuki, Sousuke Nakamura, Naoji Shiroma, Norifumi Watanabe, Arvin Agah, Hiroyuki Okada, Takashi Omori
In this study, we introduce the proposed BNS and detail its implementation. We further present experimental results confirming the advantages of our proposed approach over conventional remote assistance technologies. As we reported in prior work on BNS projects [6, 10, 12–16], the systems developed previously did not include stereo camera hardware and could not display a stereo image for the non-expert. Other previous BNSs developed by Maeda et. al. [7–9, 11] used a desktop PC, which naturally was not wearable, and lacked any communication function. Therefore, the proposed BNS with modern HMDs is the first wearable BNS of its kind integrating a stereo camera, a communication function, and a practical binocular HMD with orientation measurement and image stabilization functions [7–9, 11, 25, 26], although the technology of each element is not independently novel. The developed system can operate in wide variety of locations through mobile communication. The experimental results confirm the practicality and effectiveness of the proposed BNS.
3D reconstruction of existing concrete bridges using optical methods
Published in Structure and Infrastructure Engineering, 2019
Cosmin Popescu, Björn Täljsten, Thomas Blanksvärd, Lennart Elfgren
Established best practices (Cultural Heritage Imaging, 2018) recommend that cameras should be configured as follows: (1) the aperture should remain fixed during the capture sequence (preferably not smaller than f/11 on a 35 mm camera to avoid diffraction effects); (2) the lowest possible ISO setting should be used; (3) image stabilization and auto-rotate camera functions should be disabled; and (4) in variable light conditions, the camera should be set to aperture priority mode (with the f-stop ranging from 5.6 to 11), which locks the aperture and evens out exposure by varying the shutter speed. These recommendations were followed as closely as possible; where deviations were necessary because of some peculiarity of a particular bridge, they are noted in Table 1.
Online automatic anomaly detection for photovoltaic systems using thermography imaging and low rank matrix decomposition
Published in Journal of Quality Technology, 2022
Qian Wang, Kamran Paynabar, Massimo Pacella
A lightweight thermal camera is installed beneath the quadcopter. The camera is characterized by an uncooled vanadium oxide microbolometer with the possibility of carrying out the measurement temperature in the range of from −25 C to 135 C. The main features of this camera are: resolution 640 × 512 pixels, lens 19 mm 32 (H) × 26 (V) and thermal sensibility < 0.05 C. Image stabilization during the flight is provided by a gimbal device, which integrates images from an infrared thermal camera and a visual camera.