Super-Resolution of Brain MRI Images Using Overcomplete Dictionaries and Nonlocal Similarity
المؤلف | Li, Yinghua |
المؤلف | Song, Bin |
المؤلف | Guo, Jie |
المؤلف | Du, Xiaojiang |
المؤلف | Guizani, Mohsen |
تاريخ الإتاحة | 2020-08-18T08:34:43Z |
تاريخ النشر | 2019 |
اسم المنشور | IEEE Access |
المصدر | Scopus |
الرقم المعياري الدولي للكتاب | 21693536 |
الملخص | Recently, the magnetic resonance imaging (MRI) images have limited and unsatisfactory resolutions due to various constraints such as physical, technological, and economic considerations. Super-resolution techniques can obtain high-resolution MRI images. The traditional methods obtained the resolution enhancement of brain MRI by interpolations, affecting the accuracy of the following diagnose process. The requirement for brain image quality is fast increasing. In this paper, we propose an image super-resolution method based on overcomplete dictionaries and the inherent similarity of an image to recover the high-resolution (HR) image from a single low-resolution (LR) image. We use the linear relationship among images in the measurement domain and frequency domain to classify image blocks into smooth, texture, and edge feature blocks in the measurement domain. The dictionaries for different blocks are trained using different categories. Consequently, an LR image block of interest may be reconstructed using the most appropriate dictionary. In addition, we explore the nonlocal similarity of the image to tentatively search for similar blocks in the whole image and present a joint reconstruction method based on compressed sensing (CS) and similarity constraints. The sparsity and self-similarity of the image blocks are taken as the constraints. The proposed method is summarized in the following steps. First, a dictionary classification method based on the measurement domain is presented. The image blocks are classified into smooth, texture, and edge parts by analyzing their features in the measurement domain. Then, the corresponding dictionaries are trained using the classified image blocks. Equally important, in the reconstruction part, we use the CS reconstruction method to recover the HR brain MRI image, considering both nonlocal similarity and the sparsity of an image as the constraints. This method performs better both visually and quantitatively than some existing methods. - 2013 IEEE. |
راعي المشروع | This work was supported in part by the National Natural Science Foundation of China under Grant 61772387 and Grant 61802296, in part by the Fundamental Research Funds for the Central Universities under Grant JB180101, in part by the China Postdoctoral Science Foundation under Grant 2017M620438, in part by the Fundamental Research Funds of Ministry of Education and China Mobile under Grant MCM20170202, and in part by ISN State Key Laboratory. |
اللغة | en |
الناشر | Institute of Electrical and Electronics Engineers Inc. |
الموضوع | Brain MRI compressed sensing dictionary self-similarity sparse representation super-resolution |
النوع | Article |
الصفحات | 25897-25907 |
رقم المجلد | 7 |
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