问题描述
我遇到此错误TypeError:cv.Mat不是构造函数
I am getting this bug TypeError: cv.Mat is not a constructor
我试图做几乎所有在互联网上找不到任何解决方案的事情
I tried doing almost everything can't find any solution on internet
Index.html
Index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hello OpenCV.js</title>
</head>
<body>
<h2>Hello OpenCV.js</h2>
<p id="status">OpenCV.js is loading...</p>
<div>
<img src="dd.jpg" style="display:none;" id ="img">
<canvas id = "videoInput" height="500" width="500"></canvas>
<canvas id = "canvasOutput" height="500" width="500"></canvas>
<script async type="text/javascript" src="index.js"></script>
<script async src="opencv.js" onload="onOpenCvReady();" type="text/javascript"></script>
</body>
</html>
index.js
document.getElementById('status').innerHTML = 'OpenCV.js is ready.';
let video = document.getElementById('videoInput');
let src = new cv.Mat(video.height, video.width, cv.CV_8UC4);
let dst = new cv.Mat(video.height, video.width, cv.CV_8UC4);
let gray = new cv.Mat();
let cap = new cv.VideoCapture(video);
let faces = new cv.RectVector();
let classifier = new cv.CascadeClassifier();
// load pre-trained classifiers
classifier.load('haarcascade_frontalface_default.xml');
const FPS = 30;
function processVideo() {
try {
if (!streaming) {
// clean and stop.
src.delete();
dst.delete();
gray.delete();
faces.delete();
classifier.delete();
return;
}
let begin = Date.now();
// start processing.
cap.read(src);
src.copyTo(dst);
cv.cvtColor(dst, gray, cv.COLOR_RGBA2GRAY, 0);
// detect faces.
classifier.detectMultiScale(gray, faces, 1.1, 3, 0);
// draw faces.
for (let i = 0; i < faces.size(); ++i) {
let face = faces.get(i);
let point1 = new cv.Point(face.x, face.y);
let point2 = new cv.Point(face.x + face.width, face.y + face.height);
cv.rectangle(dst, point1, point2, [255, 0, 0, 255]);
}
cv.imshow('canvasOutput', dst);
// schedule the next one.
let delay = 1000/FPS - (Date.now() - begin);
setTimeout(processVideo, delay);
} catch (err) {
utils.printError(err);
}
};
// schedule the first one.
setTimeout(processVideo, 0);
}
我也正在导入opencv.js，因为我已经下载了opencv.js.猜猜有一些初始化问题，请帮助我解决它...
I am also importing opencv.js as i have a downloaded version of it. Guess theres some initialization problem , please help me solve it ...
推荐答案
opencv.js在真正初始化之前加载并触发onload事件.为了等到opencv.js真正准备就绪，opencv.js提供了一个钩子"onRuntimeInitialized".像这样使用它:
opencv.js loads and fires the onload event before it's really initialized. To wait until opencv.js is really ready, opencv.js provides a on hook "onRuntimeInitialized". Use it something like this:
function openCvReady() {
cv['onRuntimeInitialized']=()=>{
// do all your work here
};
}这篇关于cv.Mat不是opencv的构造函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！