Age-Gender Inference

This example showcases the usage of multi-stage neural network pipeline to make age and gender inference on a video frame.

Note

Visualization in current example is done with blocking behavor. This means that the program will halt at oak.start() until the window is closed. This is done to keep the example simple. For more advanced usage, see Blocking behavior section.

Demo

Age/gender demo

Setup

Please run the install script to download all required dependencies. Please note that this script must be ran from git context, so you have to download the depthai repository first and then run the script

git clone https://github.com/luxonis/depthai.git
cd depthai/
python3 install_requirements.py

For additional information, please follow our installation guide.

Pipeline

Pipeline graph

Source Code

Python

Also available on GitHub.

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import cv2
import numpy as np

from depthai_sdk import OakCamera
from depthai_sdk.classes import TwoStagePacket
from depthai_sdk.visualize.configs import TextPosition


def callback(packet: TwoStagePacket):
    visualizer = packet.visualizer
    for det, rec in zip(packet.detections, packet.nnData):
        age = int(float(np.squeeze(np.array(rec.getLayerFp16('age_conv3')))) * 100)
        gender = np.squeeze(np.array(rec.getLayerFp16('prob')))
        gender_str = "Woman" if gender[0] > gender[1] else "Man"

        visualizer.add_text(f'{gender_str}\nAge: {age}',
                            bbox=packet.bbox.get_relative_bbox(det.bbox),
                            position=TextPosition.BOTTOM_RIGHT)

    frame = visualizer.draw(packet.frame)
    cv2.imshow('Age-gender estimation', frame)


with OakCamera() as oak:
    color = oak.create_camera('color')
    det = oak.create_nn('face-detection-retail-0004', color)
    det.config_nn(resize_mode='crop')

    age_gender = oak.create_nn('age-gender-recognition-retail-0013', input=det)
    # age_gender.config_multistage_nn(show_cropped_frames=True) # For debugging

    # Visualize detections on the frame. Don't show the frame but send the packet
    # to the callback function (where it will be displayed)
    oak.visualize(age_gender, callback=callback)
    oak.visualize(det.out.passthrough)
    oak.visualize(age_gender.out.twostage_crops)

    # oak.show_graph() # Show pipeline graph, no need for now
    oak.start(blocking=True)  # This call will block until the app is stopped (by pressing 'Q' button)

Got questions?

Head over to Discussion Forum for technical support or any other questions you might have.