/// <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); }