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asyncFaceDetection.js
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asyncFaceDetection.js
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const cv = require('opencv4nodejs');
const classifier = new cv.CascadeClassifier(cv.HAAR_FRONTALFACE_ALT2);
cv.imreadAsync('./images/joe0.jpg')
.then(img =>
img.bgrToGrayAsync()
.then(grayImg => classifier.detectMultiScaleAsync(grayImg))
.then(
(res) => {
const { objects, numDetections } = res;
if (!objects.length) {
return Promise.reject('No faces detected!');
}
// draw detection
const facesImg = img.copy();
const numDetectionsTh = 10;
objects.forEach((rect, i) => {
const color = new cv.Vec(255, 0, 0);
let thickness = 2;
if (numDetections[i] < numDetectionsTh) {
thickness = 1;
}
facesImg.drawRectangle(
new cv.Point(rect.x, rect.y),
new cv.Point(rect.x + rect.width, rect.y + rect.height),
color,
{ thickness }
);
});
return facesImg;
}
)
.then((facesImg) => {
cv.imshowWait('face detection', facesImg);
})
)
.catch(err => console.error(err));