کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
734755 1461716 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Digital image correlation with gray gradient constraints: Application to spatially variant speckle images
ترجمه فارسی عنوان
همبستگی تصویر دیجیتال با محدودیت های گرادیان خاکستری: استفاده از تصاویر به شکل فضایی
کلمات کلیدی
همبستگی تصویر دیجیتال، اندازه زیر مجموعه، عملکرد پنجره، الگوی مارپیچ، اندازه گیری تغییر شکل
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
چکیده انگلیسی


• A concept of continuous subset is proposed with the aid of a square window function.
• A constrained ZNSSD correction criterion is established for deformation measurement.
• A set of novel DIC algorithm is developed to recover displacement field.

As a carrier of local deformation information, speckle pattern inside a subset is usually crucial for surface displacement acquisition based upon a digital image correlation (DIC) method, since both accuracy and precision of DIC method are closely related to the amount of speckle information in a subset. Although some comprehensive theoretical frameworks have been developed to estimate the quality of local speckle patterns, it is still a great challenge how to effectively integrate the subset speckle information into the well-developed correlation criteria used for DIC. By means of a well-designed square window function, we here propose the concept of continuous subset in order to modulate subset size in a continuously derivable manner. Afterwards, we further develop a new constrained zero-normalized sum-of-squared differences (CZNSSD) criterion and construct the corresponding iterative algorithm, based on which the subset size involved can be automatically determined according to the necessary amount of speckle information. Numerical results of synthetic speckle images indicate that the set of algorithm can enhance the accuracy and precision of displacement measurement, especially for spatially variant speckle images.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics and Lasers in Engineering - Volume 77, February 2016, Pages 85–91
نویسندگان
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