去模糊
点扩散函数
人工智能
计算机视觉
图像复原
计算机科学
成像体模
卷积(计算机科学)
图像质量
图像处理
迭代重建
反锐化掩蔽
图像分辨率
数学
图像(数学)
物理
人工神经网络
光学
作者
Ming Ji,Ge Wang,Margaret W. Skinner,Jay T. Rubinstein,Michael W. Vannier
出处
期刊:IEEE Transactions on Medical Imaging
[Institute of Electrical and Electronics Engineers]
日期:2003-07-01
卷期号:22 (7): 837-845
被引量:77
标识
DOI:10.1109/tmi.2003.815075
摘要
To discriminate fine anatomical features in the inner ear, it has been desirable that spiral computed tomography (CT) may perform beyond their current resolution limits with the aid of digital image processing techniques. In this paper, we develop a blind deblurring approach to enhance image resolution retrospectively without complete knowledge of the underlying point spread function (PSF). An oblique CT image can be approximated as the convolution of an isotropic Gaussian PSF and the actual cross section. Practically, the parameter of the PSF is often unavailable. Hence, estimation of the parameter for the underlying PSF is crucially important for blind image deblurring. Based on the iterative deblurring theory, we formulate an edge-to-noise ratio (ENR) to characterize the image quality change due to deblurring. Our blind deblurring algorithm estimates the parameter of the PSF by maximizing the ENR, and deblurs images. In the phantom studies, the blind deblurring algorithm reduces image blurring by about 24%, according to our blurring residual measure. Also, the blind deblurring algorithm works well in patient studies. After fully automatic blind deblurring, the conspicuity of the submillimeter features of the cochlea is substantially improved.
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