You are viewing the course site for a past offering of this course. The current offering may be found here.
Lecture 16: Cameras and Lenses (42)

I already knew about the concept of shutter speed and long-exposure photography, but this detail about cameras is making me curious about how the image sensor collects light as a function of time. Is the image sensor collecting light continuously for as long as the shutter is open, or does it have to implement some kind of polling/sampling mechanism to collect light in discreet intervals of time? And for either scenario, how is that actually implemented? I saw in an earlier slide that a sensor "accumulates irradiance during exposure", but I'm not sure what that actually means and how it's done in practice.


@krentschler When light falls on a pixel on a CMOS sensor, it causes charge to accumulate in a capacitor. This total charge is what is interpreted as the brightness of the pixel. So, for most SLRs, the sensor collects light continuously as long as the shutter is open.

You must be enrolled in the course to comment