OpenCV 4 with Python Blueprints - Second Edition

Drafting a custom filter layout

Now we are almost done! If we want to use the BaseLayout class, we need to provide code for the two methods that were previously left blank, which are as follows:

• augment_layout: This is where we can make task-specific modifications to the GUI layout.
• process_frame: This is where we perform task-specific processing on each captured frame of the camera feed.

We also need to change the constructor to initialize any parameters we will need—in this case, the canvas background for the pencil sketch:

    def __init__(self, *args, **kwargs):        super().__init__(*args, **kwargs)        color_canvas = load_img_resized('pencilsketch_bg.jpg',                                        (self.imgWidth, self.imgHeight)) self.canvas = cv2.cvtColor(color_canvas, cv2.COLOR_RGB2GRAY) ...