LiteCam for Node.js

LiteCam is a lightweight, cross-platform library for capturing RGB frames from cameras and displaying them. Designed with simplicity and ease of integration in mind, LiteCam supports Windows, Linux and macOS platforms. It integrates easily with image processing frameworks like OpenCV, making it a versatile choice for developers.

Features

• Capture RGB frames from video devices.
• Display live frames in a window.
• Draw contours and text directly on the displayed frames.
• Simple API for quick integration.

Supported Platforms

• Windows
• Linux
• macOS

How to Build the Node.js Extension

npm i node-gyp -g
npm i node-addon-api -g
node-gyp configure
node-gyp build

Usage

Basic Example

var litecam = require('litecam');
const nodecamera = new litecam.NodeCam();
console.log(litecam.getDeviceList());

if (nodecamera.open(0)) {
    let mediaTypes = nodecamera.listMediaTypes();
    console.log(mediaTypes);

    nodecamera.createWindow(nodecamera.getWidth(), nodecamera.getHeight(), "Camera Stream");
    while (nodecamera.waitKey('q')) {
        let frame = nodecamera.captureFrame();
        if (frame) {
            nodecamera.showFrame(frame['width'], frame['height'], frame['data']);
        }
    }

    nodecamera.release();
}

API Overview

• getDeviceList(): Lists available video capture devices.
• saveJpeg(filename, width, height, rgbdata): Saves the frame as a JPEG image.

NodeCam

Camera

• open(index): Opens the camera with the specified index.
• listMediaTypes(): Lists supported media types.
• setResolution(int width, int height): Sets the resolution for the camera.
• captureFrame()`: Captures a single RGB frame.
• release(): Closes the camera and releases resources.
• getWidth(): Returns the width of the frame.
• getHeight(): Returns the height of the frame.

Window

• createWindow(width, height, title): Creates a window with the specified dimensions and title.
• waitKey(key): Waits for user input; returns false if the specified key is pressed or the window is closed.
• showFrame(width, height, rgbdata): Displays a frame in the window.
• drawContour(points): Draws contours on the preview window.
• drawText(text, x, y, fontSize, color): Draws text on the preview window.