A new wavelet-based measure of image focus

被引：117
|
作者：
Kautsky, J
Flusser, J
Zitová, B
Simberová, S
机构：
[1] Acad Sci Czech Republ, Inst Informat Theory & Automat, CR-18208 Prague 8, Czech Republic
[2] Flinders Univ S Australia, Dept Math & Stat, Adelaide, SA 5001, Australia
[3] Acad Sci Czech Republ, Inst Astron, CS-25165 Ondrejov, Czech Republic
来源：
PATTERN RECOGNITION LETTERS | 2002年 / 23卷 / 14期
关键词：
image blurring; focus measure; wavelet transform; astronomical imaging;
D O I：
10.1016/S0167-8655(02)00152-6
中图分类号：
TP18 [人工智能理论];
学科分类号：
081104 ; 0812 ; 0835 ; 1405 ;
摘要：
We present a new measure of image focus. It is based on wavelet transform of the image and is defined as a ratio of high-pass band and low-pass band norms. We show this measure is monotonic with respect to the degree of defocusation and sufficiently robust. We experimentally illustrate its performance on simulated as well as real data and compare it with existing focus measures (gray-level variance and energy of Laplacian). Finally, an application of the new measure in astronomical imaging is shown. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码：1785 / 1794
页数：10
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