A Normalized Absolute Values Adaptive Evaluation Function of Image Clarity

• Published in: Sensors (Basel, Switzerland) Vol. 23; no. 22; p. 9017
• Main Authors: Wang, Xiaoyi, Yao, Tianyang, Liu, Mingkang, Zheng, Kunlei, Zhao, Chengxiang, Xiao, Longyuan, Zhu, Dongjie
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2023
• Subjects: Accuracy; adaptive background brightness; clarity evaluation; Efficiency; Fourier transforms; Informatics; Neural networks; normalized absolute value; visual measurement; China

The clarity evaluation function plays a vital role in the autofocus technique. The accuracy and efficiency of the image clarity evaluation function directly affects the accuracy of autofocus and the speed of focusing. However, classical clarity function values are sensitive to changes in background...