Fig. 8. .

Effect of hit density on 5 × 5 hybrid median filter (HMF) function. Simulated hits were positioned randomly into the Synthetic2 and Experimental1 (Fig. 4A and 4D, respectively) and the effect on coefficient of variation (CV) and signal-to-noise ratio (SNR) were determined for increasing numbers of hits (from 1 to 382 in increments of 5) along with standard deviation obtained over 100 trials. (A) Effect on CV: a negative value in the vertical axis signifies an improvement (reduction) in CV. (B) Effect on SNR: a positive value in the vertical axis signifies an improvement in SNR. Note that the 5 × 5 HMF improves CV and SNR at all hit densities; however, the magnitude of the effect diminishes as the hit density increases.