I have a question about how to init the origin timestamp to 0 at the start in Python, no a very long timestamp 1698313800401900.

[Qi Wang]

[Pierre Giraud]

Hi,

Here are two options:

1. Understand what the "long" timestamp means, and convert it to real date and time:
   

   from datetime import datetime
   
   timestamp = 1698313800401900
   
   date_and_time_string = str(datetime.fromtimestamp(timestamp/1e6))
   print(date_and_time_string)

   Which should give you:
   '2023-10-26 11:50:00.401900'
   
   
2. Simply transform all your timestamps by subtracting your "origin of time" to them:
   

   import dv_processing as dv
   
   # Recreating your event store
   store = dv.EventStore()
   store.push_back(1698313800401700, 193, 126, True)
   store.push_back(1698313800401700, 193, 127, True)
   store.push_back(1698313800401706, 192, 126, True)
   store.push_back(1698313800401706, 192, 127, True)
   store.push_back(1698313800401717, 190, 127, True)
   store.push_back(1698313800401732, 187, 123, False)
   store.push_back(1698313800401732, 187, 127, False)
   store.push_back(1698313800401738, 186, 126, False)
   store.push_back(1698313800401738, 186, 127, False)
   
   # Printing the events with original timestamps
   for ev in store:
       print(f"Original event [{ev.timestamp()}, {ev.x()}, {ev.y()}, {ev.polarity()}]")
   
   # Printing the events with shifted timestamps
   origin_of_time = store.getLowestTime()
   for ev in store:
       print(f"Shifted event [{ev.timestamp() - origin_of_time}, {ev.x()}, {ev.y()}, {ev.polarity()}]")

   This code is inspired from our dv-processing documentation: https://dv-processing.inivation.com/rel_1.7/event_store.html#create-and-store-events
   

Best Regards,

--

Pierre Giraud

Software Engineer

iniVation AG

---

From: davis...@googlegroups.com <davis...@googlegroups.com> on behalf of Qi Wang <wangq...@gmail.com>
Sent: Thursday, 26 October 2023 14:13
To: davis-users <davis...@googlegroups.com>
Subject: [davis-users] I have a question about how to init the origin timestamp to 0 at the start in Python, no a very long timestamp 1698313800401900.

 

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[Qi Wang]

Hi Pierre,

 

thank you for your reply. I think i made myself unclear at the first.I have looked at most of the examples on the documentation of dv_processing and the method you provide i have seen before.

My real question is:

•  how to get the single event data from the realtime event camera using?

All the best and thank you for replying!

Wang