js-aruco is a port to JavaScript of the ArUco library.

ArUco is a minimal library for Augmented Reality applications based on OpenCv.

100% JavaScript (see details bellow):

• Webcam live demo!

3D Pose Estimation:

• 3D Earth!

Visual Debugging:

• Debug session jam!

Webcam video adquisition

3D Pose estimation

Visual Debugging

A 7x7 grid with an external unused black border. Internal 5x5 cells contains id information.

Each row must follow any of the following patterns:

white - black - black - black - black

white - black - white - white - white

black - white - black - black - white

black - white - white - white - black

Example:

Create an AR.Detector object:

var detector = new AR.Detector();

Call detect function:

var markers = detector.detect(imageData);

markers result will be an array of AR.Marker objects with detected markers.

AR.Marker objects have two properties:

• id: Marker id.
• corners: 2D marker corners.

imageData argument must be a valid ImageData canvas object.

var canvas = document.getElementById("canvas");
    
var context = canvas.getContext("2d");

var imageData = context.getImageData(0, 0, width, height);

Create an POS.Posit object:

var posit = new POS.Posit(modelSize, canvas.width);

modelSize argument must be the real marker size (millimeters).

Call pose function:

var pose = posit.pose(corners);

corners must be centered on canvas:

var corners = marker.corners;

for (var i = 0; i < corners.length; ++ i){
  var corner = corners[i];

  corner.x = corner.x - (canvas.width / 2);
  corner.y = (canvas.height / 2) - corner.y;
}

pose result will be a POS.Pose object with two estimated pose (if any):

• bestError: Error of the best estimated pose.
• bestRotation: 3x3 rotation matrix of the best estimated pose.
• bestTranslation: Translation vector of the best estimated pose.
• alternativeError: Error of the alternative estimated pose.
• alternativeRotation: 3x3 rotation matrix of the alternative estimated pose.
• alternativeTranslation: Translation vector of the alternative estimated pose.

Note: POS namespace can be taken from posit1.js or posit2.js.

It uses Flashcam, a minimal Flash library to capture video.