Improved EAN and UPC reading
Christoph Oberhofer
10 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8"/>
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
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<title>index</title>
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<meta name="description" content=""/>
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<meta name="author" content="Christoph Oberhofer"/>
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<meta name="viewport" content="width=device-width; initial-scale=1.0"/>
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<link rel="stylesheet" type="text/css" href="css/styles.css"/>
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</head>
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<body>
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<header>
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<div class="headline">
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<h1>QuaggaJS</h1>
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<h2>An advanced barcode-scanner written in JavaScript</h2>
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</div>
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</header>
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<section id="container" class="container">
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<h3>Working with file-input</h3>
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<p>This example let's you select an image from your local filesystem.
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QuaggaJS then tries to decode the barcode using
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the preferred method (<strong>Code128</strong> or <strong>EAN</strong>).
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There is no server interaction needed as the
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file is simply accessed through the <a
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href="http://www.w3.org/TR/file-upload/">File API</a>.</p>
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<p>This also works great on a wide range of mobile-phones where the camera
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access through <code>getUserMedia</code> is still very limited.</p>
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<div class="controls">
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<fieldset class="input-group">
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<input type="file" capture/>
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<button>Rerun</button>
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</fieldset>
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<fieldset class="reader-config-group">
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<label>
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<span>Barcode-Type</span>
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<select name="decoder_readers">
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<option value="code_128" selected="selected">Code 128</option>
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<option value="code_39">Code 39</option>
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<option value="code_39_vin">Code 39 VIN</option>
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<option value="ean">EAN</option>
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<option value="ean_8">EAN-8</option>
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<option value="upc">UPC</option>
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<option value="upc_e">UPC-E</option>
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<option value="codabar">Codabar</option>
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</select>
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</label>
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<label>
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<span>Resolution (long side)</span>
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<select name="input-stream_size">
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<option value="320">320px</option>
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<option selected="selected" value="640">640px</option>
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<option value="800">800px</option>
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<option value="1280">1280px</option>
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<option value="1600">1600px</option>
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<option value="1920">1920px</option>
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</select>
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</label>
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<label>
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<span>Patch-Size</span>
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<select name="locator_patch-size">
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<option value="x-small">x-small</option>
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<option value="small">small</option>
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<option value="medium">medium</option>
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<option selected="selected" value="large">large</option>
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<option value="x-large">x-large</option>
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</select>
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</label>
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<label>
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<span>Half-Sample</span>
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<input type="checkbox" name="locator_half-sample" />
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</label>
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<label>
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<span>Workers</span>
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<select name="numOfWorkers">
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<option selected="selected" value="0">0</option>
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<option value="1">1</option>
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<option value="2">2</option>
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<option value="4">4</option>
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<option value="8">8</option>
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</select>
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</label>
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</fieldset>
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</div>
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<div id="result_strip">
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<ul class="thumbnails"></ul>
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</div>
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<div id="interactive" class="viewport"></div>
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<div id="debug" class="detection"></div>
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</section>
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<footer>
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<p>
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© Copyright by Christoph Oberhofer
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</p>
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</footer>
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<script src="../src/vendor/jquery-1.9.0.min.js" type="text/javascript"></script>
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<script data-main="file_input_require.js" src="../src/vendor/require.js"></script>
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</body>
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</html>
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requirejs.config({
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"baseUrl" : "../src",
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"shim" : {
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"typedefs" : {
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"deps" : [],
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"exports" : "typedefs"
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},
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"glMatrix" : {
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"deps" : ["typedefs"],
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"exports" : "glMatrix"
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},
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"glMatrixAddon" : {
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"deps" : ["glMatrix"],
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"exports" : "glMatrixAddon"
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}
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},
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"paths" : {
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"typedefs" : "typedefs",
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"glMatrix" : "vendor/glMatrix",
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"glMatrixAddon" : "glMatrixAddon"
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}
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});
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define(['quagga'], function(Quagga) {
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var App = {
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init: function() {
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App.attachListeners();
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},
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attachListeners: function() {
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var self = this;
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$(".controls input[type=file]").on("change", function(e) {
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if (e.target.files && e.target.files.length) {
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App.decode(URL.createObjectURL(e.target.files[0]));
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}
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});
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$(".controls button").on("click", function(e) {
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var input = document.querySelector(".controls input[type=file]");
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if (input.files && input.files.length) {
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App.decode(URL.createObjectURL(input.files[0]));
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}
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});
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$(".controls .reader-config-group").on("change", "input, select", function(e) {
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e.preventDefault();
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var $target = $(e.target),
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value = $target.attr("type") === "checkbox" ? $target.prop("checked") : $target.val(),
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name = $target.attr("name"),
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state = self._convertNameToState(name);
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console.log("Value of "+ state + " changed to " + value);
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self.setState(state, value);
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});
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},
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_accessByPath: function(obj, path, val) {
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var parts = path.split('.'),
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depth = parts.length,
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setter = (typeof val !== "undefined") ? true : false;
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return parts.reduce(function(o, key, i) {
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if (setter && (i + 1) === depth) {
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o[key] = val;
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}
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return key in o ? o[key] : {};
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}, obj);
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},
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_convertNameToState: function(name) {
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return name.replace("_", ".").split("-").reduce(function(result, value) {
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return result + value.charAt(0).toUpperCase() + value.substring(1);
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});
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},
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detachListeners: function() {
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$(".controls input[type=file]").off("change");
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$(".controls .reader-config-group").off("change", "input, select");
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$(".controls button").off("click");
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},
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decode: function(src) {
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var self = this,
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config = $.extend({}, self.state, {src: src});
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Quagga.decodeSingle(config, function(result) {});
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},
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setState: function(path, value) {
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var self = this;
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if (typeof self._accessByPath(self.inputMapper, path) === "function") {
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value = self._accessByPath(self.inputMapper, path)(value);
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}
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self._accessByPath(self.state, path, value);
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console.log(JSON.stringify(self.state));
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App.detachListeners();
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App.init();
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},
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inputMapper: {
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inputStream: {
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size: function(value){
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return parseInt(value);
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}
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},
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numOfWorkers: function(value) {
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return parseInt(value);
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},
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decoder: {
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readers: function(value) {
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return [value + "_reader"];
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}
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}
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},
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state: {
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inputStream: {
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size: 640
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},
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locator: {
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patchSize: "large",
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halfSample: false
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},
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numOfWorkers: 0,
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decoder: {
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readers: ["code_128_reader"],
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showFrequency: true,
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showPattern: true
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},
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locate: true,
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src: null
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}
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};
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App.init();
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Quagga.onProcessed(function(result) {
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var drawingCtx = Quagga.canvas.ctx.overlay,
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drawingCanvas = Quagga.canvas.dom.overlay;
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if (result) {
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if (result.boxes) {
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drawingCtx.clearRect(0, 0, parseInt(drawingCanvas.getAttribute("width")), parseInt(drawingCanvas.getAttribute("height")));
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result.boxes.filter(function (box) {
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return box !== result.box;
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}).forEach(function (box) {
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Quagga.ImageDebug.drawPath(box, {x: 0, y: 1}, drawingCtx, {color: "green", lineWidth: 2});
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});
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}
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if (result.box) {
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Quagga.ImageDebug.drawPath(result.box, {x: 0, y: 1}, drawingCtx, {color: "#00F", lineWidth: 2});
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}
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if (result.codeResult && result.codeResult.code) {
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Quagga.ImageDebug.drawPath(result.line, {x: 'x', y: 'y'}, drawingCtx, {color: 'red', lineWidth: 3});
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}
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}
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});
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Quagga.onDetected(function(result) {
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var code = result.codeResult.code,
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$node,
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canvas = Quagga.canvas.dom.image;
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$node = $('<li><div class="thumbnail"><div class="imgWrapper"><img /></div><div class="caption"><h4 class="code"></h4></div></div></li>');
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$node.find("img").attr("src", canvas.toDataURL());
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$node.find("h4.code").html(code);
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$("#result_strip ul.thumbnails").prepend($node);
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});
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});
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