We see what we need to see

In order to meet the requirements of the real-life situations, human perception need to be neither accurate nor detailed. Much more important for the active, exploring observer is instantaneous providing the relevant data that can better serve to the behavior. Not only the observer cannot perceive the complete scene, in fact he do not perceive much more than is relevant for his aim. In order to gain the relevant information from the visual field, the scene as well as the objects within are mentally adjusted, refined, some information are accentuated another suppressed. The principle role of human perception is to provide the information usable for visually guided action, not to be perfectly accurate and detailed reflection of the reality. In this context, the human visual system might be the inspiration for the creators of machine vision systems