392 lines
13 KiB
HTML
392 lines
13 KiB
HTML
<!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="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" type="text/css">
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="./resources/prism/prism.css" type="text/css">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="./resources/layout.css" type="text/css">
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<link rel="stylesheet" href="region-growing.css">
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<script src="./resources/zeroclipboard/ZeroClipboard.min.js"></script>
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<title>Region Growing</title>
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</head>
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<body>
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<header class="navbar" role="navigation">
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<div class="container" id="navbar-inner-container">
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<a class="navbar-brand" href="./"><img src="./resources/logo-70x70.png"> OpenLayers 3 Examples</a>
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</div>
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</header>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map" style="cursor: pointer"></div>
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<table class="controls">
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<tr>
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<td>Threshold: <span id="threshold-value"></span></td>
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<td><input id="threshold" type="range" min="1" max="50" value="20"></td>
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</tr>
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</table>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Region Growing</h4>
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<p id="shortdesc">Grow a region from a seed pixel</p>
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<div id="docs"><p>Click a region on the map. The computed region will be red.</p> <p>
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This example uses a <code>ol.source.Raster</code> to generate data
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based on another source. The raster source accepts any number of
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input sources (tile or image based) and runs a pipeline of
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operations on the input data. The return from the final
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operation is used as the data for the output source.
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</p> <p>
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In this case, a single tiled source of imagery data is used as input.
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The region is calculated in a single "image" operation using the "seed"
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pixel provided by the user clicking on the map. The "threshold" value
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determines whether a given contiguous pixel belongs to the "region" - the
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difference between a candidate pixel's RGB values and the seed values must
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be below the threshold.
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</p> <p>
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This example also shows how an additional function can be made available
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to the operation.
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</p>
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</div>
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<div id="tags">raster, region growing</div>
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<div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.layer.Image.html" title="API documentation for ol.layer.Image">ol.layer.Image</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.BingMaps.html" title="API documentation for ol.source.BingMaps">ol.source.BingMaps</a></li>,<li><a href="../apidoc/ol.source.Raster.html" title="API documentation for ol.source.Raster">ol.source.Raster</a></li></ul></div>
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</div>
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</div>
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<div class="row-fluid">
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<div id="source-controls">
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<a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
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<a id="jsfiddle-button"><i class="fa fa-jsfiddle"></i> Edit</a>
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</div>
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<form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
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<textarea class="hidden" name="js">// NOCOMPILE
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function growRegion(inputs, data) {
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var image = inputs[0];
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var seed = data.pixel;
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var delta = parseInt(data.delta);
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if (!seed) {
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return image;
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}
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seed = seed.map(Math.round);
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var width = image.width;
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var height = image.height;
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var inputData = image.data;
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var outputData = new Uint8ClampedArray(inputData);
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var seedIdx = (seed[1] * width + seed[0]) * 4;
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var seedR = inputData[seedIdx];
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var seedG = inputData[seedIdx + 1];
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var seedB = inputData[seedIdx + 2];
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var edge = [seed];
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while (edge.length) {
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var newedge = [];
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for (var i = 0, ii = edge.length; i < ii; i++) {
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// As noted in the Raster source constructor, this function is provided
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// using the `lib` option. Other functions will NOT be visible unless
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// provided using the `lib` option.
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var next = nextEdges(edge[i]);
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for (var j = 0, jj = next.length; j < jj; j++) {
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var s = next[j][0], t = next[j][1];
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if (s >= 0 && s < width && t >= 0 && t < height) {
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var ci = (t * width + s) * 4;
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var cr = inputData[ci];
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var cg = inputData[ci + 1];
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var cb = inputData[ci + 2];
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var ca = inputData[ci + 3];
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// if alpha is zero, carry on
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if (ca === 0) {
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continue;
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}
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if (Math.abs(seedR - cr) < delta && Math.abs(seedG - cg) < delta &&
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Math.abs(seedB - cb) < delta) {
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outputData[ci] = 255;
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outputData[ci + 1] = 0;
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outputData[ci + 2] = 0;
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outputData[ci + 3] = 255;
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newedge.push([s, t]);
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}
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// mark as visited
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inputData[ci + 3] = 0;
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}
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}
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}
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edge = newedge;
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}
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return new ImageData(outputData, width, height);
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}
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function next4Edges(edge) {
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var x = edge[0], y = edge[1];
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return [
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[x + 1, y],
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[x - 1, y],
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[x, y + 1],
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[x, y - 1]
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];
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}
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var key = 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3';
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var imagery = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Aerial'})
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});
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var raster = new ol.source.Raster({
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sources: [imagery.getSource()],
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operationType: 'image',
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operation: growRegion,
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// Functions in the `lib` object will be available to the operation run in
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// the web worker.
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lib: {
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nextEdges: next4Edges
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}
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});
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var rasterImage = new ol.layer.Image({
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opacity: 0.7,
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source: raster
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});
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var map = new ol.Map({
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layers: [imagery, rasterImage],
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target: 'map',
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view: new ol.View({
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center: ol.proj.fromLonLat([-119.07, 47.65]),
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zoom: 11
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})
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});
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var coordinate;
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map.on('click', function(event) {
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coordinate = event.coordinate;
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raster.changed();
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});
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raster.on('beforeoperations', function(event) {
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// the event.data object will be passed to operations
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var data = event.data;
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data.delta = thresholdControl.value;
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if (coordinate) {
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data.pixel = map.getPixelFromCoordinate(coordinate);
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}
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});
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var thresholdControl = document.getElementById('threshold');
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function updateControlValue() {
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document.getElementById('threshold-value').innerText = thresholdControl.value;
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}
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updateControlValue();
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thresholdControl.addEventListener('input', function() {
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updateControlValue();
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raster.changed();
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});
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</textarea>
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<textarea class="hidden" name="css">table.controls td {
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min-width: 110px;
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padding: 2px 5px;
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}
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</textarea>
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<textarea class="hidden" name="html"><div class="row-fluid">
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<div class="span12">
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<div id="map" class="map" style="cursor: pointer"></div>
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<table class="controls">
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<tr>
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<td>Threshold: <span id="threshold-value"></span></td>
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<td><input id="threshold" type="range" min="1" max="50" value="20"></td>
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</tr>
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</table>
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</div>
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</div>
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</textarea>
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<input type="hidden" name="wrap" value="l">
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<input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.9.0/css/ol.css,http://openlayers.org/en/v3.9.0/build/ol.js">
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</form>
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<pre><code id="example-source" class="language-markup"><!DOCTYPE html>
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<html>
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<head>
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<title>Region Growing</title>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
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<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>
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<style>
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table.controls td {
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min-width: 110px;
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padding: 2px 5px;
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}
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</style>
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</head>
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<body>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map" style="cursor: pointer"></div>
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<table class="controls">
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<tr>
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<td>Threshold: <span id="threshold-value"></span></td>
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<td><input id="threshold" type="range" min="1" max="50" value="20"></td>
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</tr>
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</table>
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</div>
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</div>
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</div>
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<script>
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// NOCOMPILE
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function growRegion(inputs, data) {
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var image = inputs[0];
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var seed = data.pixel;
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var delta = parseInt(data.delta);
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if (!seed) {
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return image;
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}
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seed = seed.map(Math.round);
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var width = image.width;
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var height = image.height;
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var inputData = image.data;
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var outputData = new Uint8ClampedArray(inputData);
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var seedIdx = (seed[1] * width + seed[0]) * 4;
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var seedR = inputData[seedIdx];
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var seedG = inputData[seedIdx + 1];
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var seedB = inputData[seedIdx + 2];
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var edge = [seed];
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while (edge.length) {
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var newedge = [];
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for (var i = 0, ii = edge.length; i < ii; i++) {
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// As noted in the Raster source constructor, this function is provided
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// using the `lib` option. Other functions will NOT be visible unless
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// provided using the `lib` option.
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var next = nextEdges(edge[i]);
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for (var j = 0, jj = next.length; j < jj; j++) {
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var s = next[j][0], t = next[j][1];
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if (s >= 0 && s < width && t >= 0 && t < height) {
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var ci = (t * width + s) * 4;
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var cr = inputData[ci];
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var cg = inputData[ci + 1];
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var cb = inputData[ci + 2];
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var ca = inputData[ci + 3];
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// if alpha is zero, carry on
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if (ca === 0) {
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continue;
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}
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if (Math.abs(seedR - cr) < delta && Math.abs(seedG - cg) < delta &&
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Math.abs(seedB - cb) < delta) {
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outputData[ci] = 255;
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outputData[ci + 1] = 0;
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outputData[ci + 2] = 0;
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outputData[ci + 3] = 255;
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newedge.push([s, t]);
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}
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// mark as visited
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inputData[ci + 3] = 0;
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}
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}
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}
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edge = newedge;
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}
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return new ImageData(outputData, width, height);
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}
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function next4Edges(edge) {
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var x = edge[0], y = edge[1];
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return [
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[x + 1, y],
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[x - 1, y],
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[x, y + 1],
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[x, y - 1]
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];
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}
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var key = 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3';
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var imagery = new ol.layer.Tile({
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source: new ol.source.BingMaps({key: key, imagerySet: 'Aerial'})
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});
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var raster = new ol.source.Raster({
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sources: [imagery.getSource()],
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operationType: 'image',
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operation: growRegion,
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// Functions in the `lib` object will be available to the operation run in
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// the web worker.
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lib: {
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nextEdges: next4Edges
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}
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});
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var rasterImage = new ol.layer.Image({
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opacity: 0.7,
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source: raster
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});
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var map = new ol.Map({
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layers: [imagery, rasterImage],
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target: 'map',
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view: new ol.View({
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center: ol.proj.fromLonLat([-119.07, 47.65]),
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zoom: 11
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})
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});
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var coordinate;
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map.on('click', function(event) {
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coordinate = event.coordinate;
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raster.changed();
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});
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raster.on('beforeoperations', function(event) {
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// the event.data object will be passed to operations
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var data = event.data;
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data.delta = thresholdControl.value;
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if (coordinate) {
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data.pixel = map.getPixelFromCoordinate(coordinate);
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}
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});
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var thresholdControl = document.getElementById('threshold');
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function updateControlValue() {
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document.getElementById('threshold-value').innerText = thresholdControl.value;
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}
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updateControlValue();
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thresholdControl.addEventListener('input', function() {
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updateControlValue();
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raster.changed();
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});
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</script>
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</body>
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</html></code></pre>
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</div>
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</div>
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<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
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<script src="./resources/common.js"></script>
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<script src="./resources/prism/prism.min.js"></script>
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<script src="loader.js?id=region-growing"></script>
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</body>
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</html>
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