Our eye and a camera, although very different systems, also has some similarities. What are the differences and similarities?
Since the fifteenth century Leonardo da Vinci establish the foundations of what was a darkroom , has followed the same physical process to develop consistent in obtaining an optical image from the outside. The invention consisted of a completely dark room with a small hole in one wall, this caused the outer image would cater inside inverted. That is the same concept that will serve to explain other processes, from how a camera works, to how does our own eye.
From the outset, we must say that in many cases comparisons are always somewhat unsound. They try to match two products taking as reference perhaps some numbers without considering other factors. The same goes for our eye and a camera, try asemejarlos is really crazy . While it is true that we can point to some similarities, the differences are vast.
The human eye is much more perfect, and the processes that follow to generate an image are different from those that could signal a Photo camera. However, the root of it all is that we in the invention above, the camera obscura.
Let’s start talking about how the eye generates the image in our brain. In a basic way, we could say that the rays of light pass through our pupil, later cross by Crystal , reach the retina , and finally electrical signals are sent to our brain .
On the other hand, a camera light must pass through Iris , later shall overcome all those crystals which it is composed lens , until the CCD where the image is formed, which will forward the information to the processor .
comparing it on paper is a process quite similar. That is, many of the parts of a camera acting much like how they could do the related to the anatomy of our eye. However, this explanation is reduce the functioning of the human visual organ at its finest . The layers of the eyeball are much more complex than it may seem. But, if we have this simplistic version, the eye and a camera can get to work in a way quite similar.
The truth is that it is too broad to embrace point, there are many differences between the human eye and a camera. To begin with, as my colleague said Gabriela Think Big calculate resolution of the eye is a rather complicated task. Our image is not fixed, but varies creating different fields of view with different degrees. In this regard, the bead eye could be likened more to a video camera , which is constantly recording what later sent to CCD.
However, if we had to set a figure, it is estimated that our eye would have an approximate resolution of a 576 megapixel . All this taking into account the multiple movements and angles at which these can be addressed.
Also, something similar happens with dynamic range . While the camera can only use one type of exposure for a given area, the visual brain interprets the different areas of a scene to evaluate a suitable brightness (and no, it is not comparable to a matrix metering). Cells known as canes They are responsible to adapt according to the light of what we are seeing, 100 000 000 of them are responsible for our dynamic range is infinitely superior to the of a camera.
The false belief that the focal length of the eye is similar to that of a 50mm lens
On the other hand, too We find the false belief that the focal length of the eye is similar to that of a 50mm lens . As noted in Lens Rentals , the length of the eye is not what determines our viewing area, also should note the 180 degrees that are able to cover. This would be similar to 43mm objective a full frame sensor The problem is that was not a round figure business , so that manufacturers adapted the 35mm APS-C sensor and 50mm full frame as synonymous with lenses similar to human vision.
We could go on pointing out differences as the contrast between the processing performed by the brain and the camera, or the fact that the eye is curved while the CCD is flat, but then never finish. Sometimes we feel powerless to see how vainly tried to capture a beautiful night picture with our camera, something that ends up happening because of the more obvious differences between the device we use to take pictures and the organ we use to see.
June 30, 2015
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