README.md

@@ -13,18 +13,18 @@ We have access to various data taken while riding a bike in traffic (focus is on
 A non-commercial (DIY) device that we have access to for measuring lateral distance to the road-side of the bike until the next object or up to ~6 meters. 
 
 The box measures lateral distance at frequency of 22Hz and creates a record in a csv/txt file with some metadata attached to each such lateral distance measurement (see prinscreen for an idea of what it looks like):
-1. Time stamp (if it happens to be a full second, i.e. every 22nd time)
-2. GPS position 
+1. Time stamp (if it happens to be a full second, i.e. every 22nd time) 
+2. GPS position (lat, long) 
 3. Speed (of the bike where the box is) 
-4. Lateral distance to the next object or max out
-5. Event (button press: 0/1)
+4. Lateral distance to the next object or max out 
+5. Button press: 0/1 
 
 
 ![Box file](figures/box_file_preview.png)
 
 The rider presses a button when an event is happening. Short button press for oncoming pass, long press for overtaking pass.
 
-For this project, we keep the data from alld evices in the following structure. It simplifies the utility functions. Camera files (videos) are too big to casually keep with the rest of the data, so we access them individually. 
+For this project, we keep the data from all devices in the following structure. It simplifies the utility functions. Camera files (videos) are too big to casually keep with the rest of the data, so we access them individually. 
 
 ``` text
 BikeLogs

src/modularity.py

@@ -138,6 +138,11 @@ def dispersion_score(L):
 
 def strip_and_split(part, lat_dists, threshold):
     """
+    If the part consists of multiple "events" (has a few horizontal parts with too much time separation)
+    then split the part into subparts. However, ignore subparts that are too small (<4 in length). Except if
+    it's the first part on the very left of the interval (contains index 0). Then keep that - it might correspond
+    to an event that overlaps with the button press.
+
     INPUT:
     part      - a list representing a part in a partition of vertices (indices corresponding to values in lat_dists
     lat_dists - a list of lateral distances associated with a certain button press
@@ -167,13 +172,13 @@ def strip_and_split(part, lat_dists, threshold):
                 subparts.append(sp)
                 sp = []
 
-    # discard subparts of length 4 or less
+    # discard subparts of length 3 or less, unless at the beginning (overlap with press)
     no_tiny_subparts = []
     for sp in subparts:
-        if len(sp) > 4:
+        if sp[0] == 0:
+            no_tiny_subparts.append(sp)
+            continue
+        if len(sp) > 3:
             no_tiny_subparts.append(sp)
 
-    # print("orig. part:", part)
-    # print("subparts  :", subparts)
-    # print("no_tiny   :", no_tiny_subparts)
     return no_tiny_subparts