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 eff ect 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
>
>
> On 9/22/2015 1:10 AM, ChrisB wrote:
>> It would have been a great illustration if only he had been able to
>> count the drops. Because he couldn’t I felt that it was a rather
>> pointless one. And I come back to his definition of noise: the
>> variation in numbers of drops doesn’t seem to me to be a clever way
>> to describe it.
>>
>> Chris
>>
>>> On 22 Sep 15, at 01:13, Chuck Norcutt
>>> <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>>
>>> Actually, I rather liked the analogy of raindrops and the quantum
>>> nature of light. Made perfect sense to me.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> On 9/21/2015 5:25 PM, ChrisB wrote:
>>>> Not as far as I could tell, Moose. I didn't mind the article, but
>>>> I didn't like his description of noise: the variation in light
>>>> hitting the sensor.
>>>>
>>>> I think that you'd enjoy reading it.
>>>>
>>>> Chris
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