
62 Image Processing for Cinema
Figure 3.7 shows examples of the same image acquired under these different
modes. Notice how motion is quite problematic both for interlaced and raster
progressive scanning. This latter case is the rolling-shutter problem of simple
CMOS imagers, which we’ll comment on later.
FIGURE 3.7: Left: progressive scanning, raster acquisition (line by line).
Middle: interlaced scanning. Right: progressive scanning, simultaneous acqui-
sition. Figure from [292].
But for image sensors, interlaced scanning has the advantage of allowing
us to average line values and hence increase sensitivity (at the expense of
reducing vertical resolution) ...