4.5. Describing image motion
We have looked at the main low-level features that we can extract from a single image. In the case of motion, we must consider more than one image. If we have two images obtained at different times, the simplest way in which we can detect motion is by image differencing. That is, changes or motion can be located by subtracting the intensity values; when there is no motion, the subtraction will give a zero value and when an object in the image moves their pixel's intensity changes, so the subtraction will give a value different from zero. There are links in this section, which determines detection of movement, to later material in Chapter 9 which concerns detecting the moving object and tracking its movement.
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