Skip to content

Latest commit

 

History

History
100 lines (89 loc) · 3.1 KB

README.md

File metadata and controls

100 lines (89 loc) · 3.1 KB

Multi-Sensor Grabber

App that is able to grab videos (in form of image-frames) that are annotated with

  • GPS
  • Accelerometer
  • Gyroscope
  • Timestamp

to create low-cost, mobile sequence capturing devices.

Playstore: https://play.google.com/store/apps/details?id=de.weis.multisensor_grabber

Multi-Sensor Grabber

Currently implemented

  • Acquire rights (camera, gps, etc.)
  • Fullscreen app with overlayed button start/stop capturing
  • Getting and setting desired image resolution
  • Selection of image resolution
  • Selection of framerates (10,15,...)
  • Frame includes: Timestamp, Image, GPS-data (lat,lon,accuracy,speed)
  • Save images to folder, metadata to xml-file

Below is a snippet from an example capture, names are adapted to a database system I use in the backend:

tag name meaning
sequence folder storage folder on phone
sensor identifier of the sensor (here: phone) used
ts timestamp when sequence has started
whitebalance value the whitebalance has been set to
frame uri filename (relative to sequence folder)
lat Latitude
lon Longitude
acc gps accuracy as reported by locationManager
img_w width of image
img_h height of imgae
speed speed in m/s as reported by locationManager
ts_cam timestamp of image acquisition
avelx angular velocity around x-axis
avely angular velocity around y-axis
avelz angular velocity around z-axis
accx accelerometer value about x-axis
accy accelerometer value about y-axis
accz accelerometer value about z-axis 
<sequence 
    folder="/storage/0000-0000/Android/data/com.example.weis.cv_grabber/files/multisensorgrabber_1482584089332" 
    sensor="samsungSM-G903F" 
    ts="1482584089332" 
    whitebalance="auto"
>
    <Frame 
        uri="IMG_1482584089688.jpg" 
        lat="50.16629447649796" 
        lon="8.658641955498677" 
        acc="48.0" 
        img_w="960" 
        img_h="720" 
        speed="0.0" 
        ts_cam="1482584089688" 
        avelx="-0.11246156692504883" 
        avely="0.05926918238401413" 
        avelz="-0.20069235563278198" 
        accx="9.873687744140625" 
        accy="0.18809446692466736" 
        accz="1.9354127645492554"
    />
    <Frame 
        uri="IMG_1482584089809.jpg" 
        lat="50.16629447649796" 
        lon="8.658641955498677" 
        acc="48.0" 
        img_w="960" 
        img_h="720" 
        speed="0.0" 
        ts_cam="1482584089809" 
        avelx="0.06863339245319366" 
        avely="0.09868396818637848" 
        avelz="-0.20708394050598145" 
        accx="9.767146110534668" 
        accy="-0.00823006872087717" 
        accz="1.6624737977981567"
    />

    ...
</sequence>

TODO

  • Implement func to enable user to save all available camera settings and send to me
  • Upload functionality and db-integration in backend
  • Better control of camera parameters Now using camera2 API
  • Settings Activity?
  • choose framerate (and implement)
  • gps grabbing
  • accel/gyro grabbing
  • Saving: xml/sqlite ?