let qrCodeDetector = new cv.QRCodeDetector();

function getQRCode(image) {

let [decodedText, ..._] = qrCodeDetector.detectAndDecode(image)

return decodedText;

}

function test(file) {

let img = cv.imread(file);

// let gray = cv.cvtColor(img, cv.COLOR_RGB2GRAY)

let result = "";

let num = 0;

result = getQRCode(img);

if (result == "") {

let [t, newImg] = cv.threshold(img, 0, 255, cv.THRESH_OTSU);

console.log(file);

while (result == "" && t < 255) {

num++

[t, newImg] = cv.threshold(newImg, t, 255, cv.THRESH_BINARY);

result = getQRCode(newImg);

t += 20;

}

}

console.log("try ", num, " and result: ", result);

}

test("./opencv/qrcode/2020-8-14-11-18-43-0.png");

let dir = new Qt.DirIterator("./opencv/qrcode/", Qt.Dir.Filter.NoDotAndDotDot | Qt.Dir.Filter.Files);

while (dir.hasNext()) {

//test(dir.next());

}