/// <summary>
/// Both detects and decodes QR code.
/// To simplify the usage, there is a only API: detectAndDecode
/// </summary>
/// <param name="inputImage">supports grayscale or color(BGR) image.</param>
/// <param name="bbox">optional output array of vertices of the found QR code quadrangle.Will be empty if not found.</param>
/// <param name="results">list of decoded string.</param>
public void DetectAndDecode(InputArray inputImage, out Mat[] bbox, out string[] results)
{
if (inputImage == null)
{
throw new ArgumentNullException(nameof(inputImage));
}
inputImage.ThrowIfDisposed();
using var bboxVec = new VectorOfMat();
using var texts = new VectorOfString();
NativeMethods.HandleException(
NativeMethods.wechat_qrcode_WeChatQRCode_detectAndDecode(
ptr, inputImage.CvPtr, bboxVec.CvPtr, texts.CvPtr));
bbox = bboxVec.ToArray();
results = texts.ToArray();
GC.KeepAlive(this);
GC.KeepAlive(inputImage);
}
/// <summary>
/// Decodes QR codes in image once it's found by the detect() method.
/// Returns UTF8-encoded output string or empty string if the code cannot be decoded.
/// </summary>
/// <param name="img">grayscale or color (BGR) image containing QR code.</param>
/// <param name="points">Quadrangle vertices found by detect() method (or some other algorithm).</param>
/// <param name="decodedInfo">UTF8-encoded output vector of string or empty vector of string if the codes cannot be decoded. </param>
/// <param name="straightQrCode">The optional output image containing rectified and binarized QR code</param>
/// <param name="isOutputStraightQrCode"><see langword="true"/> to output <paramref name="straightQrCode"/></param>
/// <returns></returns>
protected bool DecodeMulti(InputArray img, IEnumerable <Point2f> points, out string?[] decodedInfo, out Mat[] straightQrCode, bool isOutputStraightQrCode)
{
if (img == null)
{
throw new ArgumentNullException(nameof(img));
}
if (points == null)
{
throw new ArgumentNullException(nameof(points));
}
img.ThrowIfDisposed();
using var decodedInfoVec = new VectorOfString();
using var pointsVec = new VectorOfPoint2f(points);
int ret;
if (isOutputStraightQrCode)
{
using var straightQrCodeVec = new VectorOfMat();
NativeMethods.HandleException(
NativeMethods.objdetect_QRCodeDetector_decodeMulti(
ptr, img.CvPtr, pointsVec.CvPtr, decodedInfoVec.CvPtr, straightQrCodeVec.CvPtr, out ret));
straightQrCode = straightQrCodeVec.ToArray();
}
else
{
NativeMethods.HandleException(
NativeMethods.objdetect_QRCodeDetector_decodeMulti_NoStraightQrCode(
ptr, img.CvPtr, pointsVec.CvPtr, decodedInfoVec.CvPtr, out ret));
straightQrCode = Array.Empty <Mat>();
}
// decode utf-8 bytes.
decodedInfo = decodedInfoVec.ToArray();
GC.KeepAlive(img);
GC.KeepAlive(points);
GC.KeepAlive(this);
return(ret != 0);
}
