[opendtv] Re: CMOS sensors and rolling shutters

  • From: Dave Bittner <dave@xxxxxxxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Thu, 31 Jan 2008 10:12:40 -0500

Check out this specific example, shot from a helicopter with a CMOS camera -


http://www.ssontech.com/content/skool.mov



On Jan 31, 2008, at Thursday, January 31, 20088:52 AM, John Shutt wrote:

According to the article that Dave posted, CMOS devices don't have a physical shutter, either. The way the image is clocked out of the device line by line while letting subsequent lines continue to gather light information is referred to as a "rolling shutter" and is the cause of wobble.

A quote:

"A ROLLING SHUTTER is very different. The rolling shutter actually exposes different portions of the frame at different points in time, "rolling" through the frame. Again, it's not an actual physical moving shutter that's doing this (as opposed to a movie camera, which actually has a moving physical shutter). Instead, the sensor is telling different portions to become light-sensitive at different moments in time, and as this process proceeds down the course of the full frame, until the entire frame is exposed."

This to me sounds exactly the same as how a tube camera's electron beam scans the target and produces a signal. Hence Dave's question.

John



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