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Visual perception

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The perception (from Latin perceived) consists of receiving, through the senses, the images, sounds, impressions or external sensations. It is a psychic function which allows the body to capture, elaborate and interpret the information It comes from the environment.

It is important to differentiate between stimulus, which belongs to outside world and generates the first effect in the chain of knowledge, and perception, which is a psychological process and belongs to the inner world. It could be said that the stimulus is the physical, mechanical, thermal, chemical or electromagnetic energy that excites or activates a sensory receptor.

The visual perception is that inner sensation of apparent knowledge, resulting from a stimulus or luminous impression registered by the eyes . Usually this optical-physical act works similarly in all people, since the physiological differences of the visual organs hardly affect the result of perception.

The main differences arise with the interpretation of the information received, because of the inequalities of culture, education, intelligence and age, for example. In this sense, images can "Read" or be interpreted as a literary text, so there is the possibility of a visual perception operation learning to deepen the sense of the reading.

The psychologists of the Gestalt , at the beginning of twentieth century , were the first to propose a philosophical theory of form. Max Wertheimer , Wolfgang Köhler , Kurt Koffka and Kurt Lewin , among others, assured that, in perception, the whole is greater than the sum of the parts .

Perception of the three dimensions

With the growing success of umpteenth launch of 3D entertainment (three dimensions), came new technologies that seek to make our brain believe that the objects and beings that we see on a screen are really there; To do this, the cameras used have two lenses located at a distance such that they observe the world as our eyes do. The question is, how do they do it?

In principle, it is necessary to detail a series of concepts that represent those signs that the brain takes into account to understand what the eyes capture:

* overlay: when an object or individual is placed in front of another, our mind immediately interprets that the former is closer to us than the latter;

* vanishing points or perspective: According to Leonardo Da Vinci's research, it refers to calculating the distances between the different things or beings that we perceive, or between them and us, based on our point of view and a series of measurements that we perform at an unconscious level, such as the analysis of the decrease of objects the farther they are;

* objects whose size we know: similarly to the previous point, prior knowledge of the size of a thing or the dimensions of a living being allows us to understand how far away it is from us;

* stereopsis: term that comes from Greek and can be translated as view or solid image, and that refers to a phenomenon through which our brain takes the image captured by each eye and unites them, creating a voluminous representation of our environment.

Based on these concepts it can be deduced that the perception of depth depends mainly on a series of processes brain, of analysis of the images captured by our eyes. In the case of entertainment in three dimensions, much of the work detailed above is done by cameras and other devices; They offer us a "false" image, even more than the one projected on a 2D screen, but ironically easier for our brain to understand.

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