Non-negative matrix analysis in x-ray spectromicroscopy: choosing regularizers.
نویسندگان
چکیده
In x-ray spectromicroscopy, a set of images can be acquired across an absorption edge to reveal chemical speciation. We previously described the use of non-negative matrix approximation methods for improved classification and analysis of these types of data. We present here an approach to find appropriate values of regularization parameters for this optimization approach.
منابع مشابه
Non-negative matrix analysis for effective feature extraction in X-ray spectromicroscopy.
X-Ray absorption spectromicroscopy provides rich information on the chemical organization of materials down to the nanoscale. However, interpretation of this information in studies of "natural" materials such as biological or environmental science specimens can be complicated by the complex mixtures of spectroscopically complicated materials present. We describe here the shortcomings that somet...
متن کاملConvergent Iterative CT Reconstruction With Sparsity-Based Regularization
Statistical image reconstruction for X-ray CT can provide improved image quality at reduced patient doses. An important component of statistical reconstruction methods is the regularizer. There has been increased interest in sparsity-based regularization, typically using l1 norms. The non-smooth nature of these regularizers is a challenge for iterative optimization methods and often causes slow...
متن کاملIntroduction of Soft X-Ray Spectromicroscopy as an Advanced Technique for Plant Biopolymers Research
Soft X-ray absorption spectroscopy coupled with nano-scale microscopy has been widely used in material science, environmental science, and physical sciences. In this work, the advantages of soft X-ray absorption spectromicroscopy for plant biopolymer research were demonstrated by determining the chemical sensitivity of the technique to identify common plant biopolymers and to map the distributi...
متن کاملCharging phenomena in PEEM imaging and spectroscopy.
Spectromicroscopy with the imaging technique of X-ray photoelectron emission microscopy (X-PEEM) is a microchemical analytical tool installed in many synchrotron radiation laboratories, and which is finding application in diverse fields of research. The method of sample analysis, X-ray absorption spectroscopy, does not encounter the same problems as X-ray photoemission spectroscopy when sample ...
متن کاملSparse-View CT Reconstruction Based on Nonconvex L1 − L2 Regularizations
The reconstruction from sparse-view projections is one of important problems in computed tomography (CT) limited by the availability or feasibility of obtaining of a large number of projections. Traditionally, convex regularizers have been exploited to improve the reconstruction quality in sparse-view CT, and the convex constraint in those problems leads to an easy optimization process. However...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- AIP conference proceedings
دوره 1696 شماره
صفحات -
تاریخ انتشار 2016