What is Perception?

It is not merely interpretation of Data that poses problems.The act of perception itself is difficult to understand.Perception, at the rudimentary level,is the process by which the stimulii are received and interpreted by the brain.We are aware of the brain/brain’s existence only by its receipt and interpretation of stimulii.So, we need brain to perceive and the things perceived to prove the existence of brain.
The interplay of senses and objects to be perceived,interplay of senses and brain determine Perception.We are aware of the senses because of brain and brain because of senses and objects perceived.
At the external level, what constitutes a whole object is difficult to fathom.Is it because of a particular trait we perceive a thing as we see it or an integtrated traits /qualities that makes us aware of an object as a whole?
How do we recognise objects as such?
Is it only through senses? In that case , how did we recognise it as a particular object at the first instance?If it is because we have been told so, how did the first individual recognise it as such?
Further, things change continuously and same thing or event presents a different picture from a different angle in case of vision(ex:see different angles from the camera in a game, say cricket or foot ball) and different interpretation when we perceive at different times the same thing /event.
The answer is in Indian Philosophical treatises.