WEBCAM

Download Flojoy Studio to try this app

Acquire an image using the selected camera. The selected camera must be opened already using the OPEN_WEBCAM block. Params: connection : Camera The opened camera connection to use. resolution : select Camera resolution. Choose from a few options. Returns: out : Image

Python Code

import cv2
from flojoy import flojoy, DataContainer, CameraConnection, Image
from typing import Optional, Literal


@flojoy(deps={"opencv-python-headless": "4.8.1.78"}, inject_connection=True)
def WEBCAM(
    connection: CameraConnection,
    default: Optional[DataContainer] = None,
    resolution: Literal[
        "default", "640x360", "640x480", "1280x720", "1920x1080"
    ] = "default",
) -> Image:
    """Acquire an image using the selected camera.

    The selected camera must be opened already using the OPEN_WEBCAM block.

    Parameters
    ----------
    connection : Camera
        The opened camera connection to use.
    resolution : select
        Camera resolution. Choose from a few options.

    Returns
    -------
    Image
    """
    cam = connection.get_handle()

    try:
        if resolution != "default":
            resolution = resolution.split("x")
            try:
                cam.set(cv2.CAP_PROP_FRAME_WIDTH, int(resolution[0]))
                cam.set(cv2.CAP_PROP_FRAME_HEIGHT, int(resolution[1]))
            except cv2.error as camera_error:
                print(f"Invalid resolution ({resolution}). Try a lower value.")
                raise camera_error

        if not cam.isOpened():
            raise cv2.error("Failed to open camera")

        result, BGR_img = cam.read()

        if not result:
            raise cv2.error("Failed to capture image")
        # cam.release()
        # del cam

        RGB_img = cv2.cvtColor(BGR_img, cv2.COLOR_BGR2RGB)

        # Split the image channels
        red_channel = RGB_img[:, :, 0]
        green_channel = RGB_img[:, :, 1]
        blue_channel = RGB_img[:, :, 2]

        if RGB_img.shape[2] == 4:
            alpha_channel = RGB_img[:, :, 3]
        else:
            alpha_channel = None

        camera_image = Image(
            r=red_channel,
            g=green_channel,
            b=blue_channel,
            a=alpha_channel,
        )

        return camera_image

    except cv2.error as camera_error:
        raise camera_error

Find this Flojoy Block on GitHub

Videos

Control Camera with Flojoy

Example App

Having problems with this example app? Join our Discord community and we will help you out!

Press enter or space to select a node.You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.

Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.

Download this Flojoy App

In this example app, the WEBCAM node takes and returns a picture from a camera connected to the computer.

The camera first has to be opened with the OPEN_WEBCAM node, which requires you to select which camera to use.

The IMSHOW node displays the image taken by the camera that was selected.