This sample demonstrates face detection and classification pipeline constructed via
gst-launch-1.0 command-line utility.
How It Works
The sample utilizes GStreamer command-line tool
gst-launch-1.0 which can build and run GStreamer pipeline described in a string format. The string contains a list of GStreamer elements separated by exclamation mark
!, each element may have properties specified in the format
This sample builds GStreamer pipeline of the following elements
v4l2src for input from file/URL/web-camera
decodebin for video decoding
videoconvert for converting video frame into different color formats
- gvadetect for face detection based on OpenVINO™ Toolkit Inference Engine
- gvaclassify inserted into pipeline three times for face classification on three DL models (age-gender, emotion, landmark points)
- gvawatermark for bounding boxes and labels visualization
fpsdisplaysink for rendering output video into screen
sync=false property in
fpsdisplaysink element disables real-time synchronization so pipeline runs as fast as possible
The sample uses by default the following pre-trained models from OpenVINO™ Toolkit Open Model Zoo
- face-detection-adas-0001 is primary detection network for finding faces
- age-gender-recognition-retail-0013 age and gender estimation on detected faces
- emotions-recognition-retail-0003 emotion estimation on detected faces
- landmarks-regression-retail-0009 generates facial landmark points
NOTE: Before running samples (including this one), run script
download_models.sh once (the script located in
samples top folder) to download all models required for this and other samples.
The sample contains
model_proc subfolder with .json files for each model with description of model input/output formats and post-processing rules for classification models.
./face_detection_and_classification.sh [INPUT_VIDEO] [DEVICE] [SINK_ELEMENT]
The sample takes three command-line optional parameters:
- [INPUT_VIDEO] to specify input video file.
The input could be
- local video file
- web camera device (ex.
- RTSP camera (URL starting with
rtsp://) or other streaming source (ex URL starting with
If parameter is not specified, the sample by default streams video example from HTTPS link (utilizing
urisourcebin element) so requires internet conection.
- [DEVICE] to specify device for detection and classification.
Please refer to OpenVINO™ toolkit documentation for supported devices.
You can find what devices are supported on your system by running following OpenVINO™ toolkit sample:
- [SINK_ELEMENT] to choose between render mode and fps throughput mode:
- display - render (default)
- fps - FPS only
- prints gst-launch-1.0 full command line into console
- starts the command and either visualizes video with bouding boxes around detected faces, facial landmarks points and text with classification results (age/gender, emotion) for each detected face or prints out fps if you set SINK_ELEMENT = fps