/// <summary>
/// Extracts text regions from image
/// </summary>
/// <param name="image">Source image where text blocks needs to be extracted from. Should be CV_8UC3 (color)</param>
/// <param name="er_filter1">Extremal Region Filter for the 1st stage classifier of N&M algorithm [Neumann12]</param>
/// <param name="er_filter2">Extremal Region Filter for the 2nd stage classifier of N&M algorithm [Neumann12]</param>
/// <param name="regions">Output list of regions with text</param>
public static void DetectRegions(InputArray image, ERFilter er_filter1, ERFilter er_filter2, out Point[][] regions)
{
using (var vecRegions = new VectorOfVectorPoint())
{
NativeMethods.text_detectRegions(image.CvPtr, er_filter1.CvPtr, er_filter2.CvPtr, vecRegions.CvPtr);
regions = vecRegions.ToArray();
}
}
/// <summary>
///
/// </summary>
/// <param name="image"></param>
/// <param name="msers"></param>
/// <param name="bboxes"></param>
public virtual void DetectRegions(
InputArray image, out Point[][] msers, out Rect[] bboxes)
{
if (disposed)
throw new ObjectDisposedException(GetType().Name);
if (image == null)
throw new ArgumentNullException("nameof(image)");
image.ThrowIfDisposed();
using (var msersVec = new VectorOfVectorPoint())
using (var bboxesVec = new VectorOfRect())
{
NativeMethods.features2d_MSER_detectRegions(
ptr, image.CvPtr, msersVec.CvPtr, bboxesVec.CvPtr);
msers = msersVec.ToArray();
bboxes = bboxesVec.ToArray();
}
GC.KeepAlive(image);
}
/// <summary>
/// Detect MSER regions
/// </summary>
/// <param name="image">input image (8UC1, 8UC3 or 8UC4, must be greater or equal than 3x3)</param>
/// <param name="msers">resulting list of point sets</param>
/// <param name="bboxes">resulting bounding boxes</param>
public virtual void DetectRegions(
InputArray image, out Point[][] msers, out Rect[] bboxes)
{
ThrowIfDisposed();
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
image.ThrowIfDisposed();
using (var msersVec = new VectorOfVectorPoint())
using (var bboxesVec = new VectorOfRect())
{
NativeMethods.HandleException(
NativeMethods.features2d_MSER_detectRegions(
ptr, image.CvPtr, msersVec.CvPtr, bboxesVec.CvPtr));
GC.KeepAlive(this);
msers = msersVec.ToArray();
bboxes = bboxesVec.ToArray();
}
GC.KeepAlive(image);
}