suggestion for canon techs

Started Sep 11, 2003 | Discussions thread
Regular MemberPosts: 106
Re: suggestion for canon techs
In reply to Bill Richardson, Sep 11, 2003


It is a matter of cost/performance trades. Which is more important? The price you pay, pixel resolution or blown highlight immunity. The problem is that each pixel sensor collects photons and translates them into an electrical charge, which is stored in sensor capacitance. Only so much charge can be added to (or in some designs, depleted from) the sensor before it saturates (overflows). Modifying this process during the recording phase (i.e., dumping charge and then post-processing) requires faster, better, more complex sensors and DSP engines - this to say, expense, and may reduce sensor resolution. And this process compresses dynamic range, so that the resulting image can look pretty strange.

Note that Fujitsu has developed several sensors with dual pixel wells, one large, one small for each site. The DSP processor then selects the appropriate site for each location. This accomplishes what yo are looking for, to an extent. But the sensors sacrifice resolution & speed, and are more expensive.


Bill Richardson wrote:

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Can't the sensor be made to eliminate blown highlights like
skies? In other words, can't the individual pixels be set somehow
so that they will become less sensitive as the light contrast
becomes too high? Just a thought.
Bill Richardson
Barrington, IL (USA)

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