Page Comparison

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1. Identify the component we wish to change.

2. Create a new script called ‘custom_{COMPONENT_NAME}.py'.

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First, we have already decided we are going to change the ‘detect’ function of the FaceDetectionComponent. So secondlynext, we create a ‘custom_components’ folder in our repo if we do not have one already, and within that add a ‘custom_{COMPONENT}’ script:

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Now run ‘pip install -e .’ within your SIC repository. This will create a link in your environment to the custom_components folder so that you can easily import your custom components within your other scripts.

Writing the new component (steps 3, 4, and 5)

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class CustomFaceDetectionComponent(FaceDetectionComponent):
    def __init__(self, *args, **kwargs):
        super(CustomFaceDetectionComponent, self).__init__(*args, **kwargs)
        self.scaleFactor = 1.2
        self.minNeighbors = 3

    def detect(self, image):
        # Override the detect function with custom behavior
        img = array(image).astype(np.uint8)

        gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)

        faces = self.faceCascade.detectMultiScale(
            gray,
            scaleFactor=self.scaleFactor,  # now these Examplevariables ofbelong differentto scalethe factorclass
            minNeighbors=self.minNeighbors,    # Example of different minNeighborsthey can be accessed and changed outside this function
            minSize=(int(self.params.minW), int(self.params.minH)),
        )

        faces = [BoundingBox(x, y, w, h) for (x, y, w, h) in faces]

        return BoundingBoxesMessage(faces)

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The work on the new custom component is done. Now, you must change the scripts that you want to use the new component. Here the demo_desktop_camera_facedetection.py is used as an example.

First, make sure your script is able to find your new component. Here is one way of doing so:

import sys
from pathlib import Path
# Get the absolute path to the custom_services folder
custom_services_path = Path(__file__).resolve().parent.parent.parent / "custom_components"
sys.path.append(str(custom_services_path))

Alternatively, you can append the ‘custom_components' folder path to the PYTHONPATH environment variable within the ‘activate’ script of your virtual environment. For example:

export PYTHONPATH="/path/to/custom_components:$PYTHONPATH"

Next, import the new connector rather than the old one

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import the new connector rather than the old one

### from sic_framework.services.face_detection.face_detection import FaceDetection
from custom_components.custom_face_detection import CustomFaceDetection

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