Results 11 to 20 of about 926,619 (193)

Urban Feature Extraction from Merged Airborne LiDAR Data and Digital Camera Data

open access: yesGeoplanning: Journal of Geomatics and Planning, 2020
Until recently, the most highly accurate digital surface models were obtained from airborne lidar. With the development of a new generation of large format digital photogrammetric aerial camera, a fully digital photogrammetric workflow became possible ...
Lamyaa Gamal EL-Deen Taha   +3 more
doaj   +1 more source

Optics and Utility of Low-Cost Smartphone-Based Portable Digital Fundus Camera System for Screening of Retinal Diseases

open access: yesDiagnostics, 2022
Purpose: To describe optical principles and utility of inexpensive, portable, non-contact digital smartphone-based camera for the acquisition of fundus photographs for the evaluation of retinal disorders.
K. V. Chalam   +2 more
doaj   +1 more source

A quick-retrieval high-speed digital framing camera [PDF]

open access: yes, 1993
A new high-speed digital framing camera is described. The design is built around a rotating polygon mirror that provides a framing rate of 24 000 frames/s. The camera electronics digitizes an image into a 32×104 grid of pixels, where the second dimension
Bellan, P. M., Sato, A. H., Yee, J.
core   +1 more source

Identifying the Digital Camera from Natural Images Using Residual Noise and the Jensen–Shannon Divergence

open access: yesJournal of Electrical and Computer Engineering, 2022
Regarding the problem of digital camera identification, many methods have been proposed, and for several of them, their effectiveness has been verified on the basis of disputed flat images.
Francisco Rodríguez-Santos   +5 more
doaj   +1 more source

Using Imaging Techniques to Analyze the Microstructure of Asphalt Concrete Mixtures: Literature Review

open access: yesApplied Sciences, 2023
The performance of asphalt concrete (AC) mixtures depends highly on their internal structure and the interaction of the mixture components under different loading conditions.
Mai Alawneh, Haithem Soliman
doaj   +1 more source

RESEARCH OF DIGITAL CAMERA DYNAMIC RANGE ON THE IMAGING PROCESSING BASIS

open access: yesПриборы и методы измерений, 2017
Digital images provide to determine photometric and colorimetric properties of objects subject to validation all elements of a measuring channel (digital camera, software, display) and solve the problem of their limited dynamic ranges.
M Sutkowski, Ya. N. Saukova
doaj   +1 more source

Assessment of Temperature Effects in Interior Orientation Parameters Calibration of Optoelectronic Devices

open access: yesПриборы и методы измерений, 2020
A digital micromirror device (DMD) micromirrors periodic spatial structure is a measuring scale in interior orientation parameters calibration of optoelectronic devices problems, when using a DMD as a testobject.
M. A. Starasotnikau
doaj   +1 more source

THE DIGITAL CAMERA AS A GPS COMPASS: LOCATION MATCHING USING POINT CLOUDS [PDF]

open access: yesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012
We focus on the potential of a camera to act as a location sensor, assisting other location sensors to improve positioning accuracy. A camera is installed in almost all mobile devices.
M. Nakagawa   +5 more
doaj   +1 more source

Computational periscopy with an ordinary digital camera [PDF]

open access: yes, 2019
Computing the amounts of light arriving from different directions enables a diffusely reflecting surface to play the part of a mirror in a periscope—that is, perform non-line-of-sight imaging around an obstruction.
Goyal, Vivek K.   +2 more
core   +1 more source

Performance evaluation of non‐metric digital camera for photogrammetric application

open access: yesGeodesy and Cartography, 2012
During the last year amateur low‐cost digital cameras are increasingly expected to contribute to the digital photogrammetry. An important aspect of the suitability of these cameras is determination of their geometrical instability.
Birutė Ruzgienė
doaj   +1 more source

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