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Method and system for fast normalized cross-correlation between an image and a Gaussian for detecting spherical structures
Method and system for fast normalized cross-correlation between an image and a Gaussian for detecting spherical structures
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机译:用于在图像和高斯之间快速标准化互相关以检测球形结构的方法和系统
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摘要
A method of identifying spherical objects in a digital image is provided, wherein the image includes a plurality of intensities corresponding to a domain of points in a D-dimensional space. The method includes calculating a local cross-correlation between a point in the domain of the image and a Gaussian kernel about a neighborhood of the point; calculating a local standard deviation of the point in the image; calculating a local standard deviation of the Gaussian kernel; calculating a cross-correlation ratio by dividing the local cross-correlation by the product of the local standard deviation of the image and the local standard deviation of the Gaussian kernel; and analyzing the cross-correlation ratio to determine whether an object about said point is spherical. The cross-correlation ratio can take continuous values from −1 to 1, where a spherically symmetric Gaussian shaped object has a value of 1.
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