Median over time

This object is used to approximate the background for an image.

Here is a simple image sequence where a dot moves from left to right

Draw all 11 time values

There is a fixed background that we want to approximate using this computational action. Note that you can take the median of all of the time values, but that will require all of the time values to be read into memory at the same time, and that might not be practical.

Note that the first few time values are not going to work, since the time history is not going to be long enough to pick up the background