The interior Radon transform arises from a limited data problem in computerized tomography. The corresponding operator R is investigated as a mapping between wightedL 2-spaces. Our result is the explicit construction ...The interior Radon transform arises from a limited data problem in computerized tomography. The corresponding operator R is investigated as a mapping between wightedL 2-spaces. Our result is the explicit construction of a singular value decomposition for R. This immediately leads to an inversion formula by series expansion and range characterizations.展开更多
We study an approach to integer wavelet transform for lossless compression of medical image in medical picture archiving and communication system (PACS). By lifting scheme a reversible integer wavelet transform is gen...We study an approach to integer wavelet transform for lossless compression of medical image in medical picture archiving and communication system (PACS). By lifting scheme a reversible integer wavelet transform is generated, which has the similar features with the corresponding biorthogonal wavelet transform. Experimental results of the method based on integer wavelet transform are given to show better performance and great applicable potentiality in medical image compression.展开更多
Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous c...Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous choice of words, using the advanced and precise vocabulary to replace the primary and general ones. This paper highlights the significance of diamond words in the upgrading of literal and artistic flavor of an article, which directly affects the final grading of the writing. While summarizing and analyzing the problems of candidates in word manipulation and selection in writing, the author offers solution and strategy on how to upgrade the insipid and dull words by means of synonymous substitution and transformation with an aim to enhance the impressiveness and readability of the essay, and ultimately improve band 4/6 writing performance展开更多
基金Supported by the Foundation of the Ministry of Education of China and the Science Foundation of Wuhan University
文摘The interior Radon transform arises from a limited data problem in computerized tomography. The corresponding operator R is investigated as a mapping between wightedL 2-spaces. Our result is the explicit construction of a singular value decomposition for R. This immediately leads to an inversion formula by series expansion and range characterizations.
文摘We study an approach to integer wavelet transform for lossless compression of medical image in medical picture archiving and communication system (PACS). By lifting scheme a reversible integer wavelet transform is generated, which has the similar features with the corresponding biorthogonal wavelet transform. Experimental results of the method based on integer wavelet transform are given to show better performance and great applicable potentiality in medical image compression.
文摘Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous choice of words, using the advanced and precise vocabulary to replace the primary and general ones. This paper highlights the significance of diamond words in the upgrading of literal and artistic flavor of an article, which directly affects the final grading of the writing. While summarizing and analyzing the problems of candidates in word manipulation and selection in writing, the author offers solution and strategy on how to upgrade the insipid and dull words by means of synonymous substitution and transformation with an aim to enhance the impressiveness and readability of the essay, and ultimately improve band 4/6 writing performance
