کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
507251 | 865107 | 2011 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The circlet transform: A robust tool for detecting features with circular shapes The circlet transform: A robust tool for detecting features with circular shapes](/preview/png/507251.png)
We present a novel method for detecting circles on digital images. This transform is called the circlet transform and can be seen as an extension of classical 1D wavelets to 2D; each basic element is a circle convolved by a 1D oscillating function. In comparison with other circle-detector methods, mainly the Hough transform, the circlet transform takes into account the finite frequency aspect of the data; a circular shape is not restricted to a circle but has a certain width. The transform operates directly on image gradient and does not need further binary segmentation. The implementation is efficient as it consists of a few fast Fourier transforms. The circlet transform is coupled with a soft-thresholding process and applied to a series of real images from different fields: ophthalmology, astronomy and oceanography. The results show the effectiveness of the method to deal with real images with blurry edges.
Journal: Computers & Geosciences - Volume 37, Issue 3, March 2011, Pages 331–342