megapixel camera wikipedia image
eyeshield_
If our eyes is a camera, how many mega pixels does it have?
Answer
this is a pretty interesting question, i never thought about it like that.
but wikipedia says..
A digital camera, such as a CCD based one, has 4 "receptors" that make up a "pixel" - red, green and two blue (the human eye is more senstive to light in the blue end of the spectrum, so it has two receptors to get a more precise reading).
Human eyes have two types of receptors called "rods" and "cones". You have 4.5 million cones and 90 million rods. Now rods work better in low lighting conditions (i.e. night vision) but do not pick up color very well (if at all), whereas it is the cones that pick up color. It would be tempting to say that you have 4.5 megapixels then, but that really wouldn't be accurate. You have 94.5 pixels, only 4.5 of which can detect color. But not all of the rods and/or cones are usable in all lighting conditions, so how many usable pixels you have varies quite a bit.
The analogy kind of breaks down because you are kind of comparing apples to oranges.
Movies operate at about 60 frames per second, which is enough to fool the eyes into thinking that there is motion going on. I've heard, however, that this is a little bit of overkill, and that something like 30 frames per second will still fool the human eye.
5 months ago
this is a pretty interesting question, i never thought about it like that.
but wikipedia says..
A digital camera, such as a CCD based one, has 4 "receptors" that make up a "pixel" - red, green and two blue (the human eye is more senstive to light in the blue end of the spectrum, so it has two receptors to get a more precise reading).
Human eyes have two types of receptors called "rods" and "cones". You have 4.5 million cones and 90 million rods. Now rods work better in low lighting conditions (i.e. night vision) but do not pick up color very well (if at all), whereas it is the cones that pick up color. It would be tempting to say that you have 4.5 megapixels then, but that really wouldn't be accurate. You have 94.5 pixels, only 4.5 of which can detect color. But not all of the rods and/or cones are usable in all lighting conditions, so how many usable pixels you have varies quite a bit.
The analogy kind of breaks down because you are kind of comparing apples to oranges.
Movies operate at about 60 frames per second, which is enough to fool the eyes into thinking that there is motion going on. I've heard, however, that this is a little bit of overkill, and that something like 30 frames per second will still fool the human eye.
5 months ago
what is the difference between mega pixels and optical zoom?
rne2004
can anyone explain the difference between these two?
is this right the more mega pixels a camera has the further you can see? what about the Optical Zoom?
Answer
They have NO relation. They are extremely different.
A megapixel (MP) is 1 million pixels, and is a term used not only for the number of pixels in an image, but also to express the number of image sensor elements of digital cameras or the number of display elements of digital displays
Basically an Optical Zoom is a zoom lens. The length of Optical Zoom (point and shoot camera's refer to them as #.#x values, like 4.6x or 2.0x zoom length) is just how far it can zoom.
Read up on Megapixels: http://en.wikipedia.org/wiki/Pixel#Megapixel
Read up on Optical Zoom/Zoom Lens: http://en.wikipedia.org/wiki/Optical_zoom
They have NO relation. They are extremely different.
A megapixel (MP) is 1 million pixels, and is a term used not only for the number of pixels in an image, but also to express the number of image sensor elements of digital cameras or the number of display elements of digital displays
Basically an Optical Zoom is a zoom lens. The length of Optical Zoom (point and shoot camera's refer to them as #.#x values, like 4.6x or 2.0x zoom length) is just how far it can zoom.
Read up on Megapixels: http://en.wikipedia.org/wiki/Pixel#Megapixel
Read up on Optical Zoom/Zoom Lens: http://en.wikipedia.org/wiki/Optical_zoom
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Title Post: How many mega pixels does our eyes have?
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Rating: 92% based on 9788 ratings. 5 user reviews.
Author: Yukie
Thanks For Coming To My Blog
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