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Signal Recovery and Synthesis IV最新文献

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Speckle Imaging of Satellites 卫星散斑成像
Signal Recovery and Synthesis IV Pub Date : 1991-12-01 DOI: 10.1364/srs.1992.wa1
J. Fitch, T. Lawrence, D. Goodman, E. Johansson
{"title":"Speckle Imaging of Satellites","authors":"J. Fitch, T. Lawrence, D. Goodman, E. Johansson","doi":"10.1364/srs.1992.wa1","DOIUrl":"https://doi.org/10.1364/srs.1992.wa1","url":null,"abstract":"We performed a series of experiments using the Air Force Maui Optical Station’s 1.6 m telescope and a bare CCD detector to capture speckle images of various satellites. The speckle images were processed with bispectral techniques for recovering image Fourier phase as well as projection onto convex sets for recovering image Fourier magnitude from the projected autocorrelation. Results of imaging point stars and binaries are shown as a baseline assessment of our technique. We have reconstructed high quality images of numerous satellites and will show reconstructions of a very familiar satellite: the Hubble Space Telescope. To our knowledge, this is the first demonstration of the use of bare CCDs for speckle imaging of relatively bright objects such as artificial satellites.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128525995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Fast Positron Emission Tomography and Techniques for Noise Amelioration and Resolution Enhancement 快速正电子发射层析成像和噪声改善和分辨率提高技术
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.wd2
Danping Yang, H. Stark, N. Galatsanos, M. Wernick, Chin-Tu Chen
{"title":"Fast Positron Emission Tomography and Techniques for Noise Amelioration and Resolution Enhancement","authors":"Danping Yang, H. Stark, N. Galatsanos, M. Wernick, Chin-Tu Chen","doi":"10.1364/srs.1992.wd2","DOIUrl":"https://doi.org/10.1364/srs.1992.wd2","url":null,"abstract":"Positron Emission tomography (PET) is a method for imaging the concentration of positron-emitting radioisotopes introduced into the body of a patient. Unfortunately, like other forms of emission computed tomography (ECT), PET is plagued by serious technical problems that have severely restricted its potential in unlocking the answers to difficult questions in brain research. In particular, two problems inherent to ECT methods have hampered progress in PET: 1) Patient safety considerations and detector response characteristics impose limits on the permissible radiation dose, therefore PET images are invariably severely quantum-noise-limited; and 2) The resolution of PET images is extremely poor owing primarily to the size of the scintillation detectors used in the data-acquisition step.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115604564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Guidestar-Assisted Wavefront Sensor Speckle Holography: Postdetection Distortion Compensation using a Laser Guidestar Reference 导星辅助波前传感器散斑全息术:使用激光导星参考的检测后畸变补偿
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.wa4
J. Gonglewski, D. Dayton
{"title":"Guidestar-Assisted Wavefront Sensor Speckle Holography: Postdetection Distortion Compensation using a Laser Guidestar Reference","authors":"J. Gonglewski, D. Dayton","doi":"10.1364/srs.1992.wa4","DOIUrl":"https://doi.org/10.1364/srs.1992.wa4","url":null,"abstract":"The idea that a distorted signal may be corrected after detection by an independent distortion estimate has long been known.1,2 Currently, several researchers are investigating the application of this concept to obtaining high resolution images of astronomical objects through the atmosphere.3-5 In this case, both a (short-exposure) distorted image and a distortion estimate are formed simultaneously from the object's light. Thus pairs of independent image-distortion data are used to form the final image through deconvolution and averaging. We call our configuration of this setup Wavefront Sensor Speckle Holography (WSSH).5 This paper explores the addition of an artificial reference in the form of a laser guidestar to such a distortion-estimating imaging system6. This will improve distortion estimation and imaging system performance. See figure 1.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114520297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
High Resolution Image Reconstruction from Sparse Random Arrays 基于稀疏随机阵列的高分辨率图像重建
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.wb4
S. Clark, L. Desandre
{"title":"High Resolution Image Reconstruction from Sparse Random Arrays","authors":"S. Clark, L. Desandre","doi":"10.1364/srs.1992.wb4","DOIUrl":"https://doi.org/10.1364/srs.1992.wb4","url":null,"abstract":"In order to overcome such limitations as resolution, receiver weight and response time associated with large heavy monolithic laser radar receivers, a significant amount of work1-5 has been performed into the potential of array based systems to provide high resolution lightweight fast receivers. In order to achieve image resolution consistent with the overall size of the array, the amplitude and phase at each point in the array must be determined. As has been demonstrated in the microwave region6,7, the problem of phase errors due to errors in detector positioning and variations in the reference wavefront that are associated with the heterodyne detection process used to determine the phase, can be overcome in an adaptive way prior to using the array for imaging.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130659062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Data Clustering to Optical Linewidth Measurement 数据聚类在光学线宽测量中的应用
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.wb5
S. S. Chim, G. Kino
{"title":"Application of Data Clustering to Optical Linewidth Measurement","authors":"S. S. Chim, G. Kino","doi":"10.1364/srs.1992.wb5","DOIUrl":"https://doi.org/10.1364/srs.1992.wb5","url":null,"abstract":"In semiconductor manufacturing, submicrometer linewidth measurements are essential because they can be used to characterize VLSI processing steps; for example, in photolithography, the measured width is directly related to critical process parameters such as focus distances and exposure periods. Optical metrology is preferred because it is non-destructive and has a high throughput. Optical confocal microscopes1 and correlation microscopes2 are especially useful for metrology because they have better transverse and range definition than standard microscopes. However, as the dimensions of circuits shrink to below 0.5 μm (~ one wavelength of light), it is difficult to interpret the optical images obtained by these improved microscopes. Traditional measurement techniques based on thresholding the intensity of an optical image are not accurate enough for submicrometer measurements.3 We describe here a pattern recognition technique (based on data clustering) for recognizing line features which are otherwise difficult to measure.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131190732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of Additional Constraint Terms in Maximum A Posteriori Super Resolution 最大后验超分辨率中附加约束项的使用
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.tud3
K. West, D. Granrath, James R. Lersch
{"title":"Use of Additional Constraint Terms in Maximum A Posteriori Super Resolution","authors":"K. West, D. Granrath, James R. Lersch","doi":"10.1364/srs.1992.tud3","DOIUrl":"https://doi.org/10.1364/srs.1992.tud3","url":null,"abstract":"Super resolution algorithms derived by maximum a posteriori (MAP) estimation have been successfully applied to images of stars and other compact objects on dark backgrounds. One such algorithm, derived under the assumptions of positivity and Poisson statistics is [1] where the corresponding imaging equation is and ∗ denotes convolution, h(x) = imaging system point spread function (psf), f(x) = object, g(x) = image, and fn(x) = current estimate of object.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129885525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-Resolution Deconvolution 多分辨率反褶积
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.tud4
Jean-Luc Starck, A. Bijaoui
{"title":"Multi-Resolution Deconvolution","authors":"Jean-Luc Starck, A. Bijaoui","doi":"10.1364/srs.1992.tud4","DOIUrl":"https://doi.org/10.1364/srs.1992.tud4","url":null,"abstract":"The continuous wavelet transform of a function f(x) is [1]: where a (> 0) is a dilatation parameter and b is translation parameter. The transform is characterized by three main properties: i/ it is a linear transformation, ii/ it is unvariant under translations, iii/ it is unvariant under dilatations.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123870918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study for parallelization of simulated annealing applied to tomographic reconstruction of binary images 模拟退火并行化在二值图像层析重建中的应用实验研究
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.wd3
L. Garnero, P. Lalanne
{"title":"Experimental study for parallelization of simulated annealing applied to tomographic reconstruction of binary images","authors":"L. Garnero, P. Lalanne","doi":"10.1364/srs.1992.wd3","DOIUrl":"https://doi.org/10.1364/srs.1992.wd3","url":null,"abstract":"In the early 80's, Smith and Barrett [1] have introduced Simulated Annealing techniques (SA) in the domain of tomographic image reconstruction. Since, this technique has been tested in various domains of Medical Imaging [2]-[3]. The main advantage of SA is to theoritically converge to the global minimum of a cost or energy function. In reconstruction imaging, this cost function contains two terms : one term which represents the mean squared error between the measured and estimated data, and another term, which acts as regulazrization and translates a priori information. In another approach, Geman and Geman have showed that SA converges to the Maximum A Posteriori solution in a bayesian estimation [4].","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133712391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phase-Diverse Speckle Interferometry 相位变化散斑干涉法
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.tua2
R. Paxman, T. Schulz, J. Fienup
{"title":"Phase-Diverse Speckle Interferometry","authors":"R. Paxman, T. Schulz, J. Fienup","doi":"10.1364/srs.1992.tua2","DOIUrl":"https://doi.org/10.1364/srs.1992.tua2","url":null,"abstract":"Imaging extended objects through atmospheric turbulence can be accomplished with stellar speckle interferometry, which requires the collection of many image frames of the same object. The exposure time for each frame must be short enough (≈ 10 msec) that the evolving atmosphere can be regarded as frozen during the exposure. Current stellar speckle interferometric approachs, including Labeyrie’s method, Knox-Thompson, and triple correlation, perform an averaging of the data in the process of individually estimating the Fourier modulus or the Fourier phase of the object. The final estimated object is constructed by combining the Fourier modulus and phase estimates and performing an inverse Fourier transform. In addition, a calibration procedure must be performed using images of an unresolved object through atmospheric turbulence having the same statistics.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131798992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Phase Wrapping in Phase Retrieval Caused by Camera Noise 相机噪声引起的相位恢复中的相位包裹
Signal Recovery and Synthesis IV Pub Date : 1900-01-01 DOI: 10.1364/srs.1992.tua4
Glen H. Daw, Richard C. Smith
{"title":"Phase Wrapping in Phase Retrieval Caused by Camera Noise","authors":"Glen H. Daw, Richard C. Smith","doi":"10.1364/srs.1992.tua4","DOIUrl":"https://doi.org/10.1364/srs.1992.tua4","url":null,"abstract":"Phase wrapping in phase retrieval recovered wavefronts has been observed. The wavefronts used to generate the images used in the phase retrieval algorithm were very nearly flat, as confirmed by Strehl analysis of the images. Noise in the normally dark part of the image was the cause of the the phase wrapping. A modification to the phase retrieval image plane constraints allowed for recovery of the wavefront without the need to perform a phase unwrapping step. With this method reproducibility of better than 97 % was achieved.","PeriodicalId":300704,"journal":{"name":"Signal Recovery and Synthesis IV","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115292109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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