/// <summary>
/// Decodes QR code 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="straightQrCode">The optional output image containing rectified and binarized QR code</param>
/// <returns></returns>
public string Decode(InputArray img, IEnumerable <Point2f> points, OutputArray?straightQrCode = null)
{
if (img == null)
{
throw new ArgumentNullException(nameof(img));
}
if (points == null)
{
throw new ArgumentNullException(nameof(points));
}
img.ThrowIfDisposed();
straightQrCode?.ThrowIfNotReady();
using var pointsVec = new VectorOfPoint2f(points);
using var resultString = new StdString();
NativeMethods.HandleException(
NativeMethods.objdetect_QRCodeDetector_decode(
ptr, img.CvPtr, pointsVec.CvPtr, Cv2.ToPtr(straightQrCode), resultString.CvPtr));
GC.KeepAlive(img);
GC.KeepAlive(points);
GC.KeepAlive(straightQrCode);
GC.KeepAlive(this);
return(resultString.ToString());
}
/// <summary>
/// Both detects and decodes QR code
/// </summary>
/// <param name="img">grayscale or color (BGR) image containing QR code.</param>
/// <param name="points">opiotnal output array of vertices of the found QR code quadrangle. Will be empty if not found.</param>
/// <param name="straightQrcode">The optional output image containing rectified and binarized QR code</param>
/// <returns></returns>
public string DetectAndDecode(InputArray img, out Point2f[] points, OutputArray straightQrcode = null)
{
if (img == null)
{
throw new ArgumentNullException(nameof(img));
}
img.ThrowIfDisposed();
straightQrcode?.ThrowIfNotReady();
string result;
using (var pointsVec = new VectorOfPoint2f())
using (var resultString = new StdString())
{
NativeMethods.objdetect_QRCodeDetector_detectAndDecode(
ptr, img.CvPtr, pointsVec.CvPtr, Cv2.ToPtr(straightQrcode), resultString.CvPtr);
points = pointsVec.ToArray();
result = resultString.ToString();
}
GC.KeepAlive(img);
GC.KeepAlive(straightQrcode);
GC.KeepAlive(this);
return(result);
}
/// <summary>
/// Reads the node element as String
/// </summary>
/// <param name="defaultValue"></param>
/// <returns></returns>
public string ReadString(string?defaultValue = null)
{
using var value = new StdString();
NativeMethods.HandleException(
NativeMethods.core_FileNode_read_String(ptr, value.CvPtr, defaultValue));
GC.KeepAlive(this);
return(value.ToString());
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public override string GetDefaultName()
{
ThrowIfDisposed();
using var returnValue = new StdString();
NativeMethods.HandleException(
NativeMethods.features2d_Feature2D_getDefaultName(ptr, returnValue.CvPtr));
GC.KeepAlive(this);
return(returnValue.ToString());
}
/// <summary>
/// Returns used backend API name.
/// Note that stream should be opened.
/// </summary>
/// <returns></returns>
public string GetBackendName()
{
ThrowIfDisposed();
using var returnString = new StdString();
NativeMethods.HandleException(
NativeMethods.videoio_VideoWriter_getBackendName(ptr, returnString.CvPtr));
GC.KeepAlive(this);
return(returnString.ToString());
}
/// <summary>
/// Returns the node content as text string
/// </summary>
/// <returns></returns>
public override string ToString()
{
ThrowIfDisposed();
using var buf = new StdString();
NativeMethods.HandleException(
NativeMethods.core_FileNode_toString(ptr, buf.CvPtr));
GC.KeepAlive(this);
return(buf.ToString());
}
/// <summary>
/// Returns the normalized object name for the specified file name
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static string GetDefaultObjectName(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException(nameof(fileName));
}
using var buf = new StdString();
NativeMethods.HandleException(
NativeMethods.core_FileStorage_getDefaultObjectName(fileName, buf.CvPtr));
return(buf.ToString());
}
/// <summary>
/// Returns the algorithm string identifier.
/// This string is used as top level xml/yml node tag when the object
/// is saved to a file or string.
/// </summary>
/// <returns></returns>
public virtual string GetDefaultName()
{
if (ptr == IntPtr.Zero)
{
throw new ObjectDisposedException(GetType().Name);
}
using var buf = new StdString();
NativeMethods.HandleException(
NativeMethods.core_Algorithm_getDefaultName(ptr, buf.CvPtr));
GC.KeepAlive(this);
return(buf.ToString());
}
/// <summary>
/// Closes the file, releases all the memory buffers and returns the text string
/// </summary>
/// <returns></returns>
public string ReleaseAndGetString()
{
ThrowIfDisposed();
try
{
using var stdString = new StdString();
NativeMethods.HandleException(
NativeMethods.core_FileStorage_releaseAndGetString(ptr, stdString.CvPtr));
return(stdString.ToString());
}
finally
{
Dispose();
}
}