On the other hand, action recognition belongs to the list of tasks that can only be run with a sequence of images. Similar to how we cannot understand a sentence when we are given the words separately and unordered, we cannot recognize an action without studying a continuous sequence of images (refer to Figure 1.6).
Recognizing an action means recognizing a particular motion among a predefined set (for instance, for human actions—dancing, swimming, drawing a square, or drawing a circle). Applications range from surveillance (such as the detection of abnormal or suspicious behavior) to human-machine interactions (such as for gesture-controlled devices):
Figure 1.6: Is Barack Obama in the middle of waving, pointing at someone, swatting a mosquito, or something else?
Only the complete sequence of frames could help to label this action
Only the complete sequence of frames could help to label this action
Since object recognition can be split into object classification, detection, segmentation, and so on, so can action recognition...
