Figure 9From: A framework for measuring sharpness in natural images captured by digital cameras based on reference image and local areasThe subjective sharpness data as a function of the proposed metric. The subjective sharpness data for Dataset I as a function of the proposed metric (a) before and (b) after the nonlinear fitting. The subjective sharpness data for Dataset II as a function of the proposed metric (c) before and (d) after the nonlinear fitting.Back to article page