Alatan, Abdullah Aydın
Archaeological studies using computer vision based analysis methods on thermal imageries mainly lack an important stage of pointwise detection of artifact positions, which is needed for the automation of the system in a generic application. In this paper, we propose a pointwise detection method working in the thermal range of hyperspectral band for archaeological artifacts. The proposed method first optimally converts a given 3D hyperspectral image of the searched scene into a 2D brightness-temperature map by minimizing the mean square error (MSE) between the spectral radiance of a pixel and the Planck curves generated at different temperatures. The local maxima and minima are then found on the resulting 2D map as the candidate points. Finally, a score assignment is performed on the candidate points by using their temperature difference with respect to their neighborhood. The results on the thermal images taken from a test scene have indicated a good correlation between the extrema points and artifact positions.


A Digital signal processor based development platform for thermal imagers
Özkan, Mustafa; Beşikci, Cengiz; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2003)
The performance of thermal imaging systems depends on the sophistication level of the signal processing algorithms and the careful design of the required electronics. Digital Signal Processor (DSP) boards are very beneficial in designing such systems, and applying high level signal processing algorithms. The aim of this study is to design and implement a development platform for thermal imagers using a double floating point processor DSP board.A front-end electronics board has been employed as the interface...
A multiscale analytical correction technique for two-dimensional thermal models of AlGaN/GaN HEMTs
Azarifar, Mohammad; Donmezer, Nazli (2017-07-01)
Two-dimensional approaches are widely used in the numerical thermal models of AlGaN/GaN high electron mobility transistors (HEMTs) to reduce the high computational cost of the three-dimensional approaches. The aforementioned simplified models predict inaccurate device temperatures with significant overestimation of the thermal resistance. In order to take advantage of the computational efficiency of the two-dimensional models, a correction procedure is necessary for the accurate representation of the actual...
A Numerical Approach to Simulating Oxidation in Thermal Barrier Coatings
Saeidi, Farid; Gürses, Ercan; Aslan, Özgür (Elsevier, Elsevier, 2020-01-01)
Computational analysis and simulation of multi-physics phenomena taking place in coating systems is still a challenging task. Specifically, for ceramic coatings used as a system of protection for base materials against elevated temperatures, known as thermal barrier coating (TBC) systems, construction of continuum level models which can express coupled nonlinear phenomena has attracted great attention. Thermal stresses, oxidation, creep and numerous other mechanisms and phenomena makes it even harder to mod...
A low-power robust humidity sensor in a standard CMOS process
Okcan, Burak; Akın, Tayfun (2007-11-01)
This paper presents a low-cost thermal-conductivity-based humidity sensor implemented using a 0.6-mu m CMOS process, where suspended p-n junction diodes are used as the humidity-sensitive elements. The measurement method uses the difference between the thermal conductivities of air and water vapor at high temperatures by comparing the output voltages of two hea ted and thermally isolated diodes; one of which is exposed to the environment and has a humidity-dependent thermal conductance, while the other is s...
A Digitally programmable application specific integrated circuit for drive and data acquisition of imaging sensorsMethod of moments analysis of slotted waveguide antenna arrays
Bayhan, Nusret; Akın, Tayfun; Eminoğlu, Selim; Department of Electrical and Electronics Engineering (2014)
This thesis explains the implementation of a digital programmable Application Specific Integrated Circuit (ASIC) designed for imaging applications. The primary function of this ASIC is to drive imaging sensors and to do basic processing on the digital video data coming from the sensors. The ASIC is designed to handle the communication between the imaging sensor and the system. Using command based high-level instructions, this two-way communication is simplified. The ASIC can also be used to store and update...
Citation Formats
H. SOYDAN, H. Ş. DÜZGÜN, and A. A. Alatan, “A LOCAL EXTREMA BASED METHOD ON 2D BRIGHTNESS TEMPERATURE MAPS FOR DETECTION OF ARCHAEOLOGICAL ARTIFACTS,” 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37574.