Parametric Study to Improve Subpixel Accuracy of Nitric Oxide Tagging Velocimetry with Image Preprocessing

Figure 6

Illustration of spatial correlation technique: (a) a source window with center at (R8, C8) on the undelayed image and (b) highlighted window on the delayed image whose intensities correlate best with those of source window. Thus the tagged region is displaced two pixels in and direction with the center at (R10, C10); correlation coefficient peak .

(a)

(b)