cv.Mat 不是构造函数 opencv
我收到这个错误 TypeError: cv.Mat is not a constructor
我尝试做几乎所有事情都无法在互联网上找到任何解决方案
索引.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>
索引.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]);
}
我也在导入 opencv.js，因为我有它的下载版本。估计是初始化有问题，请帮我解决...
撒科打诨3回答
-
蓝山帝景
opencv.js 在真正初始化之前加载并触发 onload 事件。为了等到 opencv.js 真正准备好，opencv.js 提供了一个挂机“onRuntimeInitialized”。像这样使用它：function openCvReady() { cv['onRuntimeInitialized']=()=>{ // do all your work here };} -
DIEA
确保脚本真正加载。如果错误是“cv is not defined”，那么要么删除async脚本标签中的 要么添加这个（或者只是标签中的一个onload属性<script>） script.addEventListener('load', () => {在 WASM 构建（并且只有 WASM 构建）中，cv 不会立即可用，因为 WASM 是在运行时编译的。将启动功能分配给cv.onRuntimeInitialized。请注意，WASM 版本应该更快；但是，它会产生一些启动开销（几 CPU 秒）。非 WASM 根本不调用onRuntimeInitialized。要检查这两种情况，可以这样做if (cv.getBuildInformation){ console.log(cv.getBuildInformation()); onloadCallback();}else{ // WASM cv['onRuntimeInitialized']=()=>{ console.log(cv.getBuildInformation()); onloadCallback(); }}
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