Focus level

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Focus level is a term used in optics to signify the degree of visual acuity produced by a lens, often described as the extent to which the object is sharp or blurred.[1][2]


  1. ^ Rowel, A. and Zelinsky, A., A practical zoom camera calibration technique: an application on active vision for human-robot interaction. In Proceedings of the Australian Conference on Robotics and Automation, 2001, pp85-90.
  2. ^ Jing, T., and Chen, L., Adaptive multi-focus image fusion using a wavelet-based statistical sharpness measure. Signal Processing Vol. 92, No. 9, 2012, pp2137-2146.