Super-Resolution Based on Segmentation of Histgram of Image Intensity Data

This paper describes how a facial albedo map can be recovered from a single image using a statistical model that captures variations in surface normal direction. We fit the model to intensity data using constraints on the surface normal direction provided by Lambert's law and then use the differences between observed and reconstructed image brightness to estimate the albedo. We show that this process is stable under varying illumination. We then show how eigenfaces trained on albedo maps may provide a better representation for illumination insensitive recognition than those trained on raw image intensity.

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Analisis Fluktuasi Intensitas Korona saat Gerhana Matahari Total 9

Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) ◽

10.20961/prosidingsnfa.v1i0.4512 ◽

2017 ◽

Vol 1 ◽

pp. 71

Author(s):

Hendra Agus Prastyo ◽

Siti Wihdatul Himmah ◽

Nurlatifah Kafilah ◽

Rifko Harny Dwi Cahyo ◽

Bambang Setiahadi

Keyword(s):

Solar Eclipse ◽

Intensity Fluctuation ◽

Data Retrieval ◽

Total Solar Eclipse ◽

Acquisition System ◽

Intensity Data ◽

Intensity Analysis ◽

Image Intensity

Abstract: Total solar eclipse on March 9, 2016, could only be observed optimally in Indonesia. It’s the best condition to analyze the intensity fluctuation of corona. Intensity data retrieval can be done under the total solar eclipse because the corona are visible at that time. The data retrieval did not use coronagraph, but DSLR camera which connected to a telescope. This became a simple acquisition system. Intensity analysis was obtained by using IRIS 5.59 software and it has 200 pixels length in the corona. Height by intensity based data between 8,895.58-15,099.72 was equivalent to 4,000 km – 40,000.46 km from the defined solar’s surface. Keywords: Total Solar Eclipse, Corona Image Intensity Abstrak: Gerhana Matahari total 9 Maret 2016, hanya bisa diamati secara optimal di Indonesia. Kejadian gerhana ini merupakan kondisi terbaik untuk menganalisis fluktuasi intensitas korona. Pengambilan data intensitas bisa dilakukan ketika terjadi gerhana Matahari total karena korona terlihat pada waktu itu. Pengambilan data tidak menggunakan koronagraf, melainkan menggunakan kamera DSLR yang terhubung ke teleskop. Metode ini merupakan metode pengambilan data yang menerapkan sistem akuisisi sederhana. Analisis intensitas korona dilakukan dengan menggunakan software IRIS 5.59 dan menggunakan data 200 piksel di korona. Hasil penelitian menunjukkan bahwa nilai intensitas korona berada pada rentangan 8.895,58-15.099,72, dimana nilai ini berada pada ketinggian 4.000 km - 40.000,46 km dari permukaan Matahari. Kata kunci : Gerhana Matahari Total, Intensitas Citra Korona

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Quanitative aspects of electron diffraction using electron holography

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139457 ◽

1995 ◽

Vol 53 ◽

pp. 616-617

Author(s):

E. Völkl ◽

L.F. Allard ◽

B. Frost ◽

T.A. Nolan

Keyword(s):

Electron Beam ◽

Electron Diffraction ◽

Software Package ◽

Spatial Coherence ◽

Electron Holography ◽

Image Intensity ◽

Interference Fringes ◽

Complex Image ◽

The Difference ◽

Recorded Image

Off-axis electron holography has the well known ability to preserve the complex image wave within the final, recorded image. This final image described by I(x,y) = I(r) contains contributions from the image intensity of the elastically scattered electrons IeI (r) = |A(r) exp (iΦ(r)) |, the contributions from the inelastically scattered electrons IineI (r), and the complex image wave Ψ = A(r) exp(iΦ(r)) as:(1) I(r) = IeI (r) + Iinel (r) + μ A(r) cos(2π Δk r + Φ(r))where the constant μ describes the contrast of the interference fringes which are related to the spatial coherence of the electron beam, and Φk is the resulting vector of the difference of the wavefront vectors of the two overlaping beams. Using a software package like HoloWorks, the complex image wave Ψ can be extracted.

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Direct phase determination in electron crystallography: small organic molecules

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100130468 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1166-1167

Author(s):

Douglas L. Dorset

Keyword(s):

Organic Molecules ◽

Data Sets ◽

Temperature Structure ◽

3D Analysis ◽

Intensity Data ◽

Electron Crystallography ◽

Phase Determination ◽

Measured Intensity ◽

3D Data

The quantitative use of electron diffraction intensity data for the determination of crystal structures represents the pioneering achievement in the electron crystallography of organic molecules, an effort largely begun by B. K. Vainshtein and his co-workers. However, despite numerous representative structure analyses yielding results consistent with X-ray determination, this entire effort was viewed with considerable mistrust by many crystallographers. This was no doubt due to the rather high crystallographic R-factors reported for some structures and, more importantly, the failure to convince many skeptics that the measured intensity data were adequate for ab initio structure determinations.We have recently demonstrated the utility of these data sets for structure analyses by direct phase determination based on the probabilistic estimate of three- and four-phase structure invariant sums. Examples include the structure of diketopiperazine using Vainshtein's 3D data, a similar 3D analysis of the room temperature structure of thiourea, and a zonal determination of the urea structure, the latter also based on data collected by the Moscow group.

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