webpiled-opencv-calibration/index.html at master · syntheticmagus/webpiled-opencv-calibration · GitHub

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<html>

<head>
    <style>
        #container {
            margin: 0px auto;
            width: 640px;
            height: 480px;
            border: 10px #333 solid;
        }

        #canvasContainer {
            margin: 0px auto;
            width: 640px;
            height: 480px;
            border: 10px #333 solid;
        }

        #videoElement {
            width: 640px;
            height: 480px;
            background-color: #666;
        }

        #canvasElement {
            width: 640px;
            height: 480px;
            background-color: #666;
        }
    </style>
</head>

<body>
    <script src="build/webpiled-opencv-calibration.js"></script>

    <div id="container">
        <video autoplay="true" id="videoElement">

        </video>
    </div>

    <div id="canvasContainer">
        <canvas id="canvasElement">

        </canvas>
    </div>

    <hr></hr>

    <script>
        if (navigator.mediaDevices.getUserMedia) {
            navigator.mediaDevices.getUserMedia({video: true}).then(function (stream) {
                document.querySelector("#videoElement").srcObject = stream;
            })
        }
    </script>

    <script>
        function functionExists(f) {
            return f && typeof f === "function";
        }

        var canvas = document.querySelector("#canvasElement");
        canvas.width = 640 / 2;
        canvas.height = 480 / 2;
        var context = canvas.getContext("2d");
        var imagesAccepted = 0;
        //canvas.addEventListener("click", function () {
        function grabImage() {
            var video = document.querySelector("#videoElement");
            context.drawImage(video, 0, 0, canvas.width, canvas.height);

            var greenChannel = new Uint8Array(canvas.width * canvas.height);

            var imageData = context.getImageData(0, 0, canvas.width, canvas.height);
            for (var idx = 0; idx < imageData.data.length; idx += 4) {
                imageData.data[idx] = imageData.data[idx + 1];
                imageData.data[idx + 2] = imageData.data[idx + 1];

                greenChannel[idx / 4] = imageData.data[idx + 1];
            }
            context.putImageData(imageData, 0, 0);

            var buf = Module._malloc(greenChannel.length * greenChannel.BYTES_PER_ELEMENT);
            Module.HEAPU8.set(greenChannel, buf);
            imagesAccepted += Module._add_image(canvas.width, canvas.height, buf);
            Module._free(buf);

            console.log("Total accepted images: " + imagesAccepted);
            if (imagesAccepted === 30) {
                var calibration = Module._solve_for_calibration();

                console.log("Camera calibrated:");
                var offset = 0;
                console.log("\twidth: " + Module.getValue(offset + calibration, "i32"));
                offset += 4;
                console.log("\theight: " + Module.getValue(offset + calibration, "i32"));
                offset += 4;
                console.log("\terror: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tfx: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tfy: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tcx: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tcy: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tk1: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tk2: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tp1: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tp2: " + Module.getValue(offset + calibration, "double"));
                offset += 8;
                console.log("\tk3: " + Module.getValue(offset + calibration, "double"));
            }
            else if (imagesAccepted < 30) {
                setTimeout(grabImage, 1000);
            }
        }
        //});

        setTimeout(function () {
            if (functionExists(Module._add_image)) {
                console.log("The add image function exists!");
            }

            if (functionExists(Module._solve_for_calibration)) {
                console.log("The calibration function exists!");
            }

            if (functionExists(Module._initialize)) {
                console.log("The initialization function exists, too!  I'm calling it.");
                Module._initialize();
            }

            grabImage();
        }, 5000);
    </script>
</body>

</html>