XYT Tool

The tool metavision_xyt demonstrates how Contrast Detector (CD) events can be visualized in a 3D space. XYT stands for:

• X and Y, the pixel coordinates of CD events from the sensor

• T the timestamp of CD events displayed on the Z (depth) axis

The source code of this tool can be found in <install-prefix>/share/metavision/sdk/cv/cpp_samples/metavision_xyt when installing Metavision SDK from installer or packages. For other deployment methods, check the page Path of Samples.

Expected Output

Metavision XYT visualizes events in XYT space and provides some user controls to adjust the visualization:

How to start

You can directly execute pre-compiled binary installed with Metavision SDK or compile the source code as described in this tutorial.

To start the tool based on a live stream from your camera, run:

Linux

metavision_xyt

Windows

metavision_yxt.exe

To start the sample on live stream with some camera settings (like the biases mentioned above, or ROI, Anti-Flicker, STC etc.) loaded from a JSON file, you can use the command line option --input-camera-config (or -j):

Linux

./metavision_yxt -j path/to/my_settings.json

Windows

metavision_yxt.exe -j path\to\my_settings.json

To start the tool based on recorded data, provide the full path to an event file (RAW or HDF5). Here, we use the file spinner.raw from our Sample Recordings:

Linux

metavision_xyt -i spinner.raw

Windows

metavision_xyt.exe -i spinner.raw

It is also possible to launch the tool with the command line option --show-frames that allows to see the event stream next to a frame view of those same events.

Linux

metavision_xyt -i spinner.raw --show-frames

Windows

metavision_xyt.exe -i spinner.raw --show-frames

This option is a good way to show the continuous nature of our event stream:

Note that in addition to the command line options that can be discovered with metavision_xyt -h, this tool offers multiple settings that can be tuned via the Settings menu: