Some Properties of Speckle from 'Smooth' Surfaces
Tags: SPECKLE; SURFACES; FOURIER transform optics; SYMMETRY; CONTRAST effect; CORRELATION (Statistics)
Related Articles
- Extraction of height�height correlation function of random surfaces from the average intensity of image speckles. Cheng, Chuanfu; Teng, Shuyun; Liu, Man; Gong, Shangqing; Li, Ruxin; Xu, Zhizhan // Applied Physics Letters;12/9/2002, Vol. 81 Issue 24, p4544
We present a method for the extraction of the height-height correlation function of random surfaces from the average intensity of image speckles. The setup of a Fourier transforming and imaging system with a variable aperture is used for both the theoretical analysis and experimental...
- Higher Fourier Harmonics of the Directional Distribution of an Equilibrium Wave Field under Steady Wind Forcing. Wang, David W.; Hwang, Paul A. // Journal of Atmospheric & Oceanic Technology;Jan2003, Vol. 20 Issue 1, p217
Recently, directional wave spectra have been obtained by applying the two-dimensional fast Fourier transform (2D FFT) to the three-dimensional spatial topography of ocean surface waves collected by an airborne scanning laser ranging system during a quasi-equilibrium wind wave condition. The...
- Modulation transfer function of intraocular collamer lens with a central artificial hole. Uozato, Hiroshi; Shimizu, Kimiya; Kawamorita, Takushi; Ohmoto, Fumiko // Graefe's Archive of Clinical & Experimental Ophthalmology;Jul2011, Vol. 249 Issue 7, p1081
Background: A modified implantable collamer lens (ICL) with a central hole (diameter 0.36 mm), 'Hole-ICL', was created to improve aqueous humour circulation. The aim of this study is to investigate the effects of ICL power and the relationship between pupil size and modulation-transfer functions...
- Fourier Synthesis of a Three-Dimensional Surface by the Method of Multiangle Projection of Fringes. Vishnyakov, G. N.; Levin, G. G.; Loshchilov, K. E.; Sukhorukov, K. A. // Optics & Spectroscopy;Oct2005, Vol. 99 Issue 4, p654
A new method is proposed for contactless measurements of the surface shape of diffusely reflecting objects. The method is based on the multiangle projection of fringes and the joint processing of the obtained images by Fourier synthesis. It improves the spatial resolution of the reconstructed...
- Full-field Speckle Pattern Image Correlation with B-Spline Deformation Function. Peng Cheng // Experimental Mechanics;Sep2002, Vol. 42 Issue 3, p344
A full-field speckle pattern image correlation method is presented that will determine directly the complete, two-dimensional deformation field during the image correlation process on digital images obtained using computer vision systems. In this work, a B-Spline function is used to represent...
- Reconstructing spatial phase distributions and object images from speckle intensity patterns of the diffraction field. Gorbatenko, B. B.; Ryabukho, V. P.; Maksimova, L. A. // Optics & Spectroscopy;Nov2006, Vol. 101 Issue 5, p811
A method of reconstruction of the spatial phase distribution and the image of a scattering object from a recorded speckle pattern of the diffraction field has been developed and verified on test objects. The proposed method is based on an assumption that, for objects of a certain class, the...
- Displacement fields U and V by interferometry of three beams. Martínez, Amalia; Rayas, J. A.; Meneses-Fabián, Cruz; Anguiano-Morales, Marcelino; Mendoza, Fernando // AIP Conference Proceedings;4/15/2008, Vol. 992 Issue 1, p1011
The simultaneous measurement of the two in-plane displacement components by electronic speckle pattern interferometry with three objects beams and without in-line reference beam is presented. Three interference fringes patterns corresponding to three different sensitivity vectors are recorded in...
- Spectral and directional emittance of alumina at 823 K. Teodorescu, George; Jones, Peter // Journal of Materials Science;Nov2008, Vol. 43 Issue 22, p7225
Spectral�directional emittance measurements of aluminum oxide (99.5% pure), in air, were performed at 823 K using an apparatus comprised of a Fourier Transform Infrared (FTIR) spectrometer, a blackbody radiating cavity (hohlraum), and a sample holder which allows directional measurements. The...
- An accurate and robust method for the honing angle evaluation of cylinder liner surface using machine vision. Lawrence.K, Deepak; Ramamoorthy, Balakrishnan // International Journal of Advanced Manufacturing Technology;Jul2011, Vol. 55 Issue 5-8, p611
This paper presents a machine vision-based method for evaluating honing angle of cylinder liners by exploring the frequency domain characteristics of cylinder liner images. An image-processing algorithm based on Fourier transform and Hough transform is developed and applied on images containing...
