Flexible focus function consisting of convex function and image enhancement filter

作者：Wang, Kai; Qian, Yuntao^*; Ye, Minchao; Luo, Zhijian

来源：Optics Express, 2014, 22(15): 18668-18687.

DOI：10.1364/OE.22.018668

• POINT-SPREAD FUNCTION
• MODULATION TRANSFER-FUNCTION
• AUTOMATED MICROSCOPY
• AUTOFOCUS ALGORITHM
• SYSTEM

We propose a new focus function. that, like many of the existing focus functions, consists of a convex function and an image enhancement filter. A is rather flexible because for any convex function and image enhancement filter, it is a focus function. We proved that. is a focus function using a model and Jensen's inequality. Furthermore, we generated random.s and experimentally applied them to simulated and real blurred images, finding that 98% and 99% of the random.s, respectively, have a maximum value at the best-focused image and most of them decrease as the defocus increases. We also applied random.s to motion-blurred images, blurred images in different-sized windows, and blurred images with different types of noise. We found that. can be applied to motion blur and is robust to different-sized windows and different noise types.

• 出版日期2014-7-28
• 单位浙江大学