If you just stare at a computer or TV screen, you see what you are supposed to see. However, if you look at either through a camera, you see dark stripes continously on the screen. What causes this?
2006-07-16 16:26:59 · 3 answers · asked by Will the Thrill 5 in Science & Mathematics ➔ Chemistry
The image on the screen is "painted" (scanned) on by a moving beam of electrons. This scanning takes a preset amount of time. and usually occurs about 60 to 70 times a second. The camera also scans to "see" but not at the same rate and not "lock step" with the image your aimed at. The bars result from the difference in the scanning rates. You don't see it with your eye because the eye doesn't react quite that fast.
2006-07-16 16:36:34 · answer #1 · answered by batty_professor 2 · 0⤊ 0⤋
Could be a scan-rate effect or it could be Moire effect, which is interference due to the differing pixel densities of the TV image received at the camera and that of the camera itself. Wiki (ref.) was the only web source I could find that discusses this. If it's Moire you can lessen the effect by defocusing the camera a little.
2006-07-23 16:48:47 · answer #2 · answered by kirchwey 7 · 0⤊ 0⤋
it is basically a strobe effect, the scanning rate is different between the screen and camera. Notice you dont see this on LCD monitors
2006-07-17 00:13:54 · answer #3 · answered by orion_1812@yahoo.com 6 · 0⤊ 0⤋