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Re: [OM] Digital Noise

Subject: Re: [OM] Digital Noise
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 22 Sep 2015 17:19:42 -0400
Film vs digital. I wouldn't have known that if he hadn't clarified what he meant with: "... image-based sensors rely on photo-sensitive chemical reactions."

Chuck Norcutt


On 9/22/2015 2:33 PM, ChrisB wrote:
Thanks, Chuck.  I did study physics, but I must have missed the
lessons on digital sensors;-)

But what is the difference between digital and image sensors, in this
context?

Chris

On 22 Sep 2015, at 15:06, Chuck
Norcutt<chucknorcutt@xxxxxxxxxxxxxxxx>  wrote:

Did you not study physics?  Does this paper help?
<http://people.csail.mit.edu/hasinoff/pubs/hasinoff-photon-2012-preprint.pdf>



From the first page of the paper: Image sensors measure scene
irradiance by*counting*  the number of discrete photons incident
on the sensor over a given time interval. In digital sensors, the
photoelectric effect is used to convert photons into electrons,
whereas image-based sensors rely on photo-sensitive chemical
reactions. In both cases, the independence of random individual
photon arrivals leads to photon noise, a signal- dependent form
of uncertainty that is a property of the underlying signal
itself.

My emphasis on*counting* Chuck Norcutt
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