Focus and Blurriness Measure Using Reorganized DCT Coefficients for an Autofocus Application

In this paper, two metrics for measuring image sharpness are presented and used for an autofocus (AF) application. Both measures exploit reorganized discrete cosine transform (DCT) representation. The first metric is a focus measure, which involves optimal high- and middle-frequency coefficients to...

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Veröffentlicht in:	IEEE transactions on circuits and systems for video technology 2018-01, Vol.28 (1), p.15-30
Hauptverfasser:	Zhang, Zheng, Liu, Yu, Xiong, Zhihui, Li, Jing, Zhang, Maojun
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Audio frequencies Block-based discrete cosine transform (DCT) Coefficients Discrete cosine transform Discrete cosine transforms Distortion measurement focus measure Frequency measurement Image contrast Image edge detection image quality assessment image sharpness assessment Multiscale analysis Noise Noise measurement Noise sensitivity Position measurement Robustness Sharpness sharpness measure State of the art
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