if there was a screen that took up my entire field of view, what approximate resoution would it be at (in pixelsxpixels).
2006-07-23 18:29:50 · 4 answers · asked by bob o 2 in Science & Mathematics ➔ Biology
There are 120 million rods and cones in the eye. So you need a screen with 120 million pixels to resolve this.
11000x11000 pixels would do.
That's the retina for you.
On the other hand, these 120 million photoreceptors project to only 1 million independent nerve fibers in the optical nerve.
So the resolution in the cortex is much coarser.
Which is why XGA is normally enough (1200x800 pixels).
But that doesn't account for focusing on one part of the screen (the fovea has a better resolution) and attention.
But 11000x11000 is definitely the higher limit, 1200x800 the lower.
Why?
2006-07-23 18:35:42 · answer #1 · answered by Ejsenstejn 2 · 2⤊ 0⤋
The visual acuity of 20/20 vision is 1.0 arc minute. (http://en.wikipedia.org/wiki/Visual_acuity). To equate this to pixel separation, if s is distance between pixels, and d is the viewing distance, angular separation is arctan(s/d). This is approximately (180/pi)*(s/d) degrees, or (10800/pi)*(s/d) arc minutes. At a viewing distance of 10ft, 20/20 vision will resolve pixels that are approximately .034 inches apart. If you have an HDTV with 1920 horizontal pixels, the screen would be ~70" wide. Or a screen 40" wide should have 40/.034 = ~1200 pixels. Remember screen sizes are given in the diagonal measurement, and the ratio of width to height is 16:9. For a screen of diagonal r, the width is r/1.15.
It is not coincidence that 1920 and 1250 are standard resolutions for HDTV; they were selected by the ATSC on the basis of normal viewing distance from large screen size to matchthe eye resolution.
2006-07-23 19:06:17 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
errr, well, can u really measure in pixels?? i suppose it will be defined by how many electrons of light enregy is entering the pupils of ur eyes. and that number, well i guess a many orger of magnitudes!
2006-07-23 18:34:23 · answer #3 · answered by TS 1 · 0⤊ 0⤋
Well, it depends. The resolution is higher in the fovea.
http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html#c2
2006-07-23 18:35:51 · answer #4 · answered by Anonymous · 0⤊ 0⤋