The human eye is an organ that reacts to light and has several purposes. As a conscious sense organ, the mammalian eye allows vision.The human eye can distinguish about 10 million colors
The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye
The Earth's surface curves out of sight at a distance of 3.1 miles, or 5
kilometers. But our visual acuity extends far beyond the horizon. If
Earth were flat, or if you were standing atop a mountain surveying a
larger-than-usual patch of the planet, you could perceive bright lights
hundreds of miles distant. On a dark night, you could even see a candle
flame flickering up to 30 mi. (48 km) away.
As if a human eye were popped into a camera, researchers have created a lens-shaped detector and placed it into a digital camera. The result, they say, could give the cameras a wider field of view and the capacity to produce crisper images.
The "electronic eye camera" relies on silicon detectors and electronics
that can be shaped to a curved surface. Like the human eye, the curved
light detectors act like our retina's rods and cones, which detect the incoming light and transfer it via the optic nerve to the brain where an image is formed.
"The retina is sort of on the back surface of your eyeball," said researcher John Rogers of the University of Illinois at Urbana-Champaign. "So in our cameras, we have a similar kind of eyeball that's made out of glass and our [silicon photo] detector sits on the surface of that hemispherical cavity in the same way that your rods and cones sit on the back surface of your eyeball."
Dynamic range* is one area where the eye is often seen as having a huge advantage. If we were to consider situations where our pupil opens and closes for different brightness regions, then yes, our eyes far surpass the capabilities of a single camera image (and can have a range exceeding 24 f-stops). However, in such situations our eye is dynamically adjusting like a video camera, so this arguably isn't a fair comparison.
Configuration :
The Human Eye Specifications - 576MP!
I was interested in how the human eye compares to digital imaging and so far have found and compiled this table from the sources listed at bottom:
Human Eye Specifications (typical):
Sensor (Retina) : 22mm diameter x 0.5mm thick (section); 10 layers
Resolution : 576MP equiv.
Visual Acuity : ~ 74 MP (Megapixels) (printed) to show detail at the limits of human visual acuity
ISO : 1 - 800 equivalent
Data Rate : 500,000 bits per second without colour or around 600,000 bits per second including colour.
Lens : 2 lenses - 16mm & 24mm diameter
Dynamic Range - Static : contrast ratio of around 100:1 (about 6 1/2 f-stops) (4 seconds)
Dynamic Range - Dynamic : contrast ratio of about 1,000,000:1 (about 20 f-stops) (30 minutes)
Focal Length : ~ 3.2mm - (~ 22mm 35mm equiv)
Aperture : f2.1 - f8.3 (f3.5 dark-adapted is claimed by the astronomical community)
FOV Field of View : 95° Out, 75° Down, 60° In, 60° Up
Color Space - 3D (non-linear) RGB
Color Sensitivity : 10,000,000 (ten million)
Color Range : 380 to 740 nm
White Balance : Automatic (constant perceived color under different lighting)
Refresh Rate : foveal vision (high-quality telescopic) - 3-4fps; peripheral vision (very inaccurate) - up to 90fps
(just for fun compiled ! !)
The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye
As if a human eye were popped into a camera, researchers have created a lens-shaped detector and placed it into a digital camera. The result, they say, could give the cameras a wider field of view and the capacity to produce crisper images.
"The retina is sort of on the back surface of your eyeball," said researcher John Rogers of the University of Illinois at Urbana-Champaign. "So in our cameras, we have a similar kind of eyeball that's made out of glass and our [silicon photo] detector sits on the surface of that hemispherical cavity in the same way that your rods and cones sit on the back surface of your eyeball."
Dynamic range* is one area where the eye is often seen as having a huge advantage. If we were to consider situations where our pupil opens and closes for different brightness regions, then yes, our eyes far surpass the capabilities of a single camera image (and can have a range exceeding 24 f-stops). However, in such situations our eye is dynamically adjusting like a video camera, so this arguably isn't a fair comparison.
Configuration :
The Human Eye Specifications - 576MP!
I was interested in how the human eye compares to digital imaging and so far have found and compiled this table from the sources listed at bottom:
Human Eye Specifications (typical):
Sensor (Retina) : 22mm diameter x 0.5mm thick (section); 10 layers
Resolution : 576MP equiv.
Visual Acuity : ~ 74 MP (Megapixels) (printed) to show detail at the limits of human visual acuity
ISO : 1 - 800 equivalent
Data Rate : 500,000 bits per second without colour or around 600,000 bits per second including colour.
Lens : 2 lenses - 16mm & 24mm diameter
Dynamic Range - Static : contrast ratio of around 100:1 (about 6 1/2 f-stops) (4 seconds)
Dynamic Range - Dynamic : contrast ratio of about 1,000,000:1 (about 20 f-stops) (30 minutes)
Focal Length : ~ 3.2mm - (~ 22mm 35mm equiv)
Aperture : f2.1 - f8.3 (f3.5 dark-adapted is claimed by the astronomical community)
FOV Field of View : 95° Out, 75° Down, 60° In, 60° Up
Color Space - 3D (non-linear) RGB
Color Sensitivity : 10,000,000 (ten million)
Color Range : 380 to 740 nm
White Balance : Automatic (constant perceived color under different lighting)
Refresh Rate : foveal vision (high-quality telescopic) - 3-4fps; peripheral vision (very inaccurate) - up to 90fps
(just for fun compiled ! !)
