mclaffey / claffey_matlab Goto Github PK

A user asked:

1. vid.params.analysis_bin_size_in_secs = 60;
   I would like to know what the line above does and why is it set at 60

2. I would like to know why even when the object does not go thought the cropped area it will still register a distance in the final report.

1. The bin size refers to how to divide up the video analysis in terms of time. For example, a video might be 300 seconds long. The analysis generates metrics such as the average x position. If you set bin size to 60 (seconds), it will calculate a separate average x for each minute (each bin of 60 seconds), so you'll have 5 consecutive values. If you wanted finer grain analysis, you could set bin size to 10 (seconds) and get 30 consecutive values. I choose 60 as a default of 1 minute, because that was a reasonable bin for my experiment.

2. I believe that distance is the average distance between the tracked object and the center of the cropped area. In my experiment, I was looking at mice inspecting two different objects within their cage. I highlighted each object as an area. Even if the mouse never interacted directly with the object, I could still see, on average, how close he was to each object. Hope that helps.

Encountered by a new user of the project after running these lines in the vidz_demo script

sub_analysis = input('Enter name of sub-analysis: ', 's');
vid = vidz_files(video_path, sub_analysis, analysis_dir);

My reply to that user: If I'm remembering correctly, this isn't actually an error. It's just reporting that you haven't told it to use the files/directory for the previously analyzed video. It thinks that you are starting a new analysis, i.e. starting from scratch. As long as that's the case, you should be able to continue with the next lines in the script.