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index.html
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<html>
<head>
<title>OCR Receipt</title>
<link rel='stylesheet' href='main.css' />
<script src='https://cdn.rawgit.com/naptha/tesseract.js/1.0.10/dist/tesseract.js'></script>
</head>
<body>
<p>This looks up the biggest rectangular area and rectifies it. Tapping/clicking on the output will start the OCR process with Tesseract JS. Tapping/touching the video pauses/resumes.</p>
<div class="panel">
<div class="panel-header">Input</div>
<div id="videoContainer">
<div id="videoContainerWrapper">
<video autoplay id="videoElement">
</video>
<canvas id="videoOverlay"></canvas>
</div>
</div>
</div>
<div class="panel">
<div class="panel-header">Output</div>
<canvas id="output"></canvas>
<br/>
<progress id="barOCR" value="0"></progress>
<br/>
<textarea id="txtOutput">
</textarea>
</div>
<hr/>
<hr/>
<button id="toggleDebug">Toggle debug</button>
<label><input id="chkHighRes" type="checkbox"></input>Use high res preview (slower)</label>
<div id="debugstuff">
<div class="panel">
<div class="panel-header">Timing</div>
<span id="txt"></span>
</div>
<br/>
<div class="panel">
<div class="panel-header">Pre canny</div>
<canvas id="preCanny"></canvas>
<canvas id="histogram" width="256" height="256"></canvas>
</div>
<div class="panel">
<div class="panel-header">Post canny</div>
<canvas id="postCanny"></canvas>
</div>
<div class="panel">
<div class="panel-header">Dilate & erode (closing)</div>
<canvas id="morph"></canvas>
</div>
<div class="panel">
<div class="panel-header">Finding best contour</div>
<canvas id="contourResult"></canvas>
</div>
<div class="panel">
<div class="panel-header">Warped perspective</div>
<canvas id="warpPerspectiveResult"></canvas>
</div>
<!--<img id="img" style="display:none" src="https://i.imgur.com/vx1C7vl.png" crossorigin="anonymous">-->
<img id="img" style="display:none" src="https://i.imgur.com/kv9LgAj.png" crossorigin="anonymous">
</div>
<script src='main.js'></script>
</body>
</html>