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∣log⁡I(t)−log⁡I(tlast event)∣≥C\left|\log I(t) - \log I(t_{\text{last event}})\right| \geq C

Why this formula appears here

An event camera, more precisely a dynamic vision sensor (DVS), inverts that design at the pixel level. Each pixel contains its own small analog circuit — a photoreceptor, a differencing amplifier, and a pair of comparators — that continuously tracks the logarithm of local light intensity and fires an asynchronous digital event only when that log-intensity has moved by more than a threshold since the pixel’s last event. Formally, a pixel emits an event when ∣log⁡I(t)−log⁡I(tlast event)∣≥C\left|\log I(t) - \log I(t_{\text{last event}})\right| \geq C. where C is a contrast threshold set by an analog bias current, and each event carries just an address, a timestamp, and a sign — brighter or darker — streamed out asynchronously on a shared digital bus rather than…

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II

Symbol I

I is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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tt

Symbol t

t is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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tlast eventt_{\text{last event}}

Symbol t_last event

tlt_last event is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

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CC

Symbol C

a contrast threshold set by an analog bias current, and each event carries just an address, a timestamp, and a sign — brighter or darker — streamed out asynchronously on a shared digital bus rather than assembled into frames.

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Published contexts (1)

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∣log⁡I(t)−log⁡I(tlast event)∣≥C,\left|\log I(t) - \log I(t_{\text{last event}})\right| \geq C,

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This equation states a bound: one expression must stay on the indicated side of the other under the article’s assumptions.

An event camera, more precisely a dynamic vision sensor (DVS), inverts that design at the pixel level. Each pixel contains its own small analog circuit — a photoreceptor, a differencing amplifier, and a pair of comparators — that continuously tracks the logarithm of local light intensity and fires an asynchronous digital event only when that log-intensity has moved by more than a threshold since the pixel’s last event. Formally, a pixel emits an event when ∣log⁡I(t)−log⁡I(tlast event)∣≥C\left|\log I(t) - \log I(t_{\text{last event}})\right| \geq C. where C is a contrast threshold set by an analog bias current, and each event carries just an address, a timestamp, and a sign — brighter or darker — streamed out asynchronously on a shared digital bus rather than…

Meanings in this article

  • CC: a contrast threshold set by an analog bias current, and each event carries just an address, a timestamp, and a sign — brighter or darker — streamed out asynchronously on a shared digital bus rather than assembled into frames.
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