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05/09/2011

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Josh

Hi John - Thanks for the thorough write-up on QuickCam!! The "leaning" you see is caused by the iPhone sensor having a rolling shutter rather than a global shutter. With a global shutter, all pixels in the image are capture at the exact same time so you wouldn't see this effect. With a rolling shutter, each line of the image is captured one at a time. So the first line is captured right away, then the second, third and so on. Some time later, although not long, the last line of the image is captured and the photo is complete. So if the camera is moving, the first line will be from the initial position of the camera. The last line will be from another position. This is what causes the leaning effect.

You can see this obviously by holding the camera in portrait mode and moving it up and down. You should see a slanting to the left and then to the right as you move.

Anyway, hope that makes sense and thanks again!

Josh

John

Josh, thanks very much for the explanation. I've copied it and put it in the body of the post.

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