Yilmaz, O.
Selimoglu, O.
Ucar, B.
Sengul, O.
Imaging from air has evolved from film cameras to digital cameras over the last years. Here we give the design steps of an aerial objective lens for a given CCD sensor. Matching to the pixel pitch of the sensor and providing desired field of view according to CCD size are traditional steps. Besides these, to minimize the environmental effects, design should be insensitive to the temperature and pressure as much as possible. Performance of a lens, designed at room temperature and pressure will be degraded if temperature and pressure changes. This is firstly caused by the change of relative refraction indices of materials, and secondly thermal expansion or contraction of both glass and housing materials. Here it is shown that according to the environmental working conditions, custom designs are necessary to provide images with sufficient resolution up in the air. These design principles are also valid for the fore optics of spectroscopic imaging tools. Since designs are insensitive to temperature and pressure, working environmental range is wide.


Automatic tests for camera performance analysis
Hasarpa, Alican; Akar, Gözde; Department of Electrical and Electronics Engineering (2018)
The camera technology is consistently improving, with high definition, smartcameras being utilized all around the world. Because of the different quality of such cameras, the camera performance analysis plays a critical role for the end users in order to determine the real difference between the available alternatives. The image quality of a camera may be assessed visually using digitally generated test patterns in a controlled environment. The main purpose of this thesis is to automate this assessment and ...
FPGA implementation of real time digital video super resolution for infrared cameras
Aktukmak, Mehmet; Halıcı, Uğur; Department of Electrical and Electronics Engineering (2013)
At present, the quality of image taken from infrared cameras is low compared to the other cameras because of manufacturing technology. So, resolution enhancement processes are becoming more important for these cameras. Super resolution is a good approach to solve this resolution problem. In general, the systems that infrared cameras used require video processing to perform in real time. So, a suitable approach should be selected and implemented to work in real time. The computational load and processing tim...
Evaluation of tone mapping and exposure fusion algorithms on HDR videos for face detection and recognition
Çavdarlı, Fehime Betül; Akyüz, Ahmet Oğuz; Department of Computer Engineering (2022-2-08)
High dynamic range (HDR) images have become popular recently especially for video surveillance systems. One of the most important reasons for this is that in areas where there is under or over-exposure, classical low dynamic range (LDR) images are insufficient to capture details, while HDR images have better visual details and contain wide range illumination values. However, since HDR images cannot be viewed on conventional LDR displays, additional processing such as tonemapping and/or fusion are required t...
Coding algorithms for 3DTV - A survey
Smolic, Aljoscha; Mueller, Karsten; Stefanoski, Nikolce; Ostermann, Joern; Gotchev, Atanas; Akar, Gözde; Triantafyllidis, Georgios; Koz, Alper (2007-11-01)
Research efforts on 3DTV technology have been strengthened worldwide recently, covering the whole media processing chain from capture to display. Different 3DTV systems rely on different 3-D scene representations that integrate various types of data. Efficient coding of these data is crucial-for the success of 3DTV. Compression of pixel-type data including stereo video, multiview video, and associated depth or disparity maps extends available principles of classical video coding. Powerful algorithms and ope...
Analysis and comparison of the contrast enhancement techniques for infrared images
Turan, Arif Ergün; Akar, Gözde; Department of Electrical and Electronics Engineering (2012)
Today, infrared cameras are used especially for target tracking and surveillance operations. However, they have a high dynamic range output, and the standard display devices cannot handle them. In order to show them on common devices, the dynamic range is cropped. Thus, the contrast of the image is reduced. This is called as the High Dynamic Range (HDR) Compression. Although several algorithms have been proposed for preserving details during the HDR compression process, it cannot be used to enhance the loca...
Citation Formats
O. Yilmaz, O. Selimoglu, B. Ucar, and O. Sengul, “DESIGN STEPS TO TEMPERATURE AND PRESSURE INSENSITIVE OPTICAL SYSTEMS FOR DIGITAL AERIAL IMAGING,” 2010, p. 0, Accessed: 00, 2020. [Online]. Available: