I want to ask about the starting time of a new frame in a sequence of frames captured by a CMOS sensor. Assume that the readout time of the entire sensor is 10ms, and the exposure time is less than 10ms. Will the next exposure of the first row of the sensor begin at the starting time of the next frame which is described in the first figure below? Or the exposure begin right after the readout of the previous frame complete (I think it's not possible)?
Or the starting time of the exposure is aligned to the right to ensure that beginning of the readout of the first row of the second frame starts right after the readout of the last row of the first frame has finished, which is described in the second figure below.
@mattdm: I have never asked "When a CMOS sensor is read line-by-line, which line is considered to mark the starting time?". It is the first line which marks the starting time, of course. But my question is when the exposure of the first row begin.