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https://gitcode.com/gh_mirrors/es/esp32-opencv.git
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121 lines
3.4 KiB
HTML
121 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Video Capture Example</title>
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<link href="js_example_style.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h2>Video Capture Example</h2>
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<p>
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Click <b>Start/Stop</b> button to start or stop the camera capture.<br>
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The <b>videoInput</b> is a <video> element used as OpenCV.js input.
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The <b>canvasOutput</b> is a <canvas> element used as OpenCv.js output.<br>
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The code of <textarea> will be executed when video is started.
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You can modify the code to investigate more.
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</p>
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<div>
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<div class="control"><button id="startAndStop" disabled>Start</button></div>
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<textarea class="code" rows="29" cols="100" id="codeEditor" spellcheck="false">
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</textarea>
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</div>
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<p class="err" id="errorMessage"></p>
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<div>
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<table cellpadding="0" cellspacing="0" width="0" border="0">
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<tr>
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<td>
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<video id="videoInput" width=320 height=240></video>
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</td>
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<td>
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<canvas id="canvasOutput" width=320 height=240></canvas>
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</td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td>
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<div class="caption">videoInput</div>
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</td>
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<td>
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<div class="caption">canvasOutput</div>
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</td>
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<td></td>
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<td></td>
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</tr>
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</table>
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</div>
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<script src="https://webrtc.github.io/adapter/adapter-5.0.4.js" type="text/javascript"></script>
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<script src="utils.js" type="text/javascript"></script>
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<script id="codeSnippet" type="text/code-snippet">
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let video = document.getElementById('videoInput');
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let src = new cv.Mat(video.height, video.width, cv.CV_8UC4);
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let dst = new cv.Mat(video.height, video.width, cv.CV_8UC1);
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let cap = new cv.VideoCapture(video);
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const FPS = 30;
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function processVideo() {
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try {
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if (!streaming) {
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// clean and stop.
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src.delete();
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dst.delete();
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return;
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}
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let begin = Date.now();
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// start processing.
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cap.read(src);
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cv.cvtColor(src, dst, cv.COLOR_RGBA2GRAY);
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cv.imshow('canvasOutput', dst);
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// schedule the next one.
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let delay = 1000/FPS - (Date.now() - begin);
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setTimeout(processVideo, delay);
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} catch (err) {
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utils.printError(err);
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}
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};
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// schedule the first one.
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setTimeout(processVideo, 0);
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</script>
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<script type="text/javascript">
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let utils = new Utils('errorMessage');
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utils.loadCode('codeSnippet', 'codeEditor');
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let streaming = false;
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let videoInput = document.getElementById('videoInput');
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let startAndStop = document.getElementById('startAndStop');
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let canvasOutput = document.getElementById('canvasOutput');
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let canvasContext = canvasOutput.getContext('2d');
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startAndStop.addEventListener('click', () => {
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if (!streaming) {
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utils.clearError();
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utils.startCamera('qvga', onVideoStarted, 'videoInput');
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} else {
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utils.stopCamera();
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onVideoStopped();
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}
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});
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function onVideoStarted() {
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streaming = true;
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startAndStop.innerText = 'Stop';
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videoInput.width = videoInput.videoWidth;
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videoInput.height = videoInput.videoHeight;
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utils.executeCode('codeEditor');
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}
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function onVideoStopped() {
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streaming = false;
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canvasContext.clearRect(0, 0, canvasOutput.width, canvasOutput.height);
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startAndStop.innerText = 'Start';
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}
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utils.loadOpenCv(() => {
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startAndStop.removeAttribute('disabled');
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});
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</script>
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</body>
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</html>
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