Figure 7.

Human pixel estimation accuracy. (a) Performance accuracy for all conditions for all observers. The horizontal axis is the actual gray level of the missing pixel and the vertical axis is the value estimated by the human observers. If performance were perfect all points would fall along the diagonal line. Also, given is the MSE of the human estimates. (Note that these MSE values correspond to standard deviations of around 15 to 16 gray-level steps.) (b) Human estimation errors for all conditions and observers. The horizontal axis is the actual gray level of the missing pixel and the vertical axis is the difference between the observer's estimate and the actual gray level of the missing pixel.