This paper proposes a novel exemplar- based method for reducing noise in computed tomography （CT） images. In the proposed method, denoising is performed on each block with the help of a given database of standard im...This paper proposes a novel exemplar- based method for reducing noise in computed tomography （CT） images. In the proposed method, denoising is performed on each block with the help of a given database of standard image blocks. For each noisy block, its denoised version is the best sparse positive linear combination of the blocks in the database. We formulate the problem as a constrained optimization problem such that the solution is the denoised block. Experimental results demonstrate the good performance of the proposed method over current state-of-the-art denoising methods, in terms of both objective and subjective evaluations.展开更多
"Over the last 40 years,we have consistently adhered to an independent foreign policy of peace,followed the path of peaceful development and pursued a win-win strategy of opening-up,"declared Chinese Preside..."Over the last 40 years,we have consistently adhered to an independent foreign policy of peace,followed the path of peaceful development and pursued a win-win strategy of opening-up,"declared Chinese President Xi Jinping,also general secretary of the Communist Party of China(CPC)Central Committee,at a major event on December 18,2018,organized to commemorate the 40th anniversary of reform and opening-up.展开更多
文摘This paper proposes a novel exemplar- based method for reducing noise in computed tomography （CT） images. In the proposed method, denoising is performed on each block with the help of a given database of standard image blocks. For each noisy block, its denoised version is the best sparse positive linear combination of the blocks in the database. We formulate the problem as a constrained optimization problem such that the solution is the denoised block. Experimental results demonstrate the good performance of the proposed method over current state-of-the-art denoising methods, in terms of both objective and subjective evaluations.
文摘"Over the last 40 years,we have consistently adhered to an independent foreign policy of peace,followed the path of peaceful development and pursued a win-win strategy of opening-up,"declared Chinese President Xi Jinping,also general secretary of the Communist Party of China(CPC)Central Committee,at a major event on December 18,2018,organized to commemorate the 40th anniversary of reform and opening-up.
