added functions to downsample images

[jdppthk]

No description provided.

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ jdppthk
❌ EC2 Default User

---

EC2 Default User seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[NileGraddis]

There are a couple of oddities about this function. One is that it selects the output column by integer index rather than name, which will fail if you run into a stim table with differently-ordered or inserted columns. The other is that you are looking at start times and not end times, so if you supply a time after the bounds of the experiment, this function will happily report the last value from the dataframe (rather than throwing an error or otherwise notifying the caller).

Maybe something like this (sans error handling):

def get_frame_at_time(time, stim_table):
    return stim_table.loc[(stim_table['start'] <= time) & (stim_table['end'] > time), 'frame'].values[0]