/// <summary>
/// Extracts the contours of Maximally Stable Extremal Regions
/// </summary>
/// <param name="image">The image where mser will be extracted from</param>
/// <param name="mask">Can be null if not needed. Optional parameter for the region of interest</param>
/// <param name="storage">The storage where the contour will be saved</param>
/// <returns>The MSER regions</returns>
public Seq<Point>[] ExtractContours(IImage image, Image<Gray, Byte> mask, MemStorage storage)
{
MCvMSERParams p = GetMSERParameters();
IntPtr mserPtr = new IntPtr();
CvInvoke.cvExtractMSER(image.Ptr, mask, ref mserPtr, storage, p);
IntPtr[] mserSeq = new Seq<IntPtr>(mserPtr, storage).ToArray();
return Array.ConvertAll<IntPtr, Seq<Point>>(mserSeq, delegate(IntPtr ptr) { return new Seq<Point>(ptr, storage); });
}
/// <summary>
/// Get the MSER parameters
/// </summary>
/// <returns>The MSER parameters</returns>
public MCvMSERParams GetMSERParameters()
{
MCvMSERParams p = new MCvMSERParams();
p.Delta = Delta;
p.MaxArea = MaxArea;
p.MinArea = MinArea;
p.MaxVariation = MaxVariation;
p.MinDiversity = MinDiversity;
p.MaxEvolution = MaxEvolution;
p.AreaThreshold = AreaThreshold;
p.MinMargin = MinMargin;
p.EdgeBlurSize = EdgeBlurSize;
return p;
}
/// <summary>
/// Create a MSER detector using the specific parameters
/// </summary>
/// <param name="delta">Use 5 as defalut. In the code, it compares (size_{i}-size_{i-delta})/size_{i-delta}</param>
/// <param name="maxArea">Use 60 as default. Prune the area which bigger than max_area</param>
/// <param name="minArea">Use 14400 as default. Prune the area which smaller than min_area</param>
/// <param name="maxVariation">Use .25f as default. Prune the area have simliar size to its children</param>
/// <param name="minDiversity">Use .2f as default. Trace back to cut off mser with diversity < min_diversity</param>
/// <param name="maxEvolution">Use 200 as default. For color image, the evolution steps</param>
/// <param name="areaThreshold">Use 1.01 as default. The area threshold to cause re-initialize</param>
/// <param name="minMargin">Use 0.003 as default. Ignore too small margin</param>
/// <param name="edgeBlurSize">Use 5 as default. The aperture size for edge blur</param>
public MSERDetector(
int delta, int maxArea, int minArea, float maxVariation, float minDiversity,
int maxEvolution, double areaThreshold, double minMargin, int edgeBlurSize)
{
_delta = delta;
_maxArea = maxArea;
_minArea = minArea;
_maxVariation = maxVariation;
_minDiversity = minDiversity;
_maxEvolution = maxEvolution;
_areaThreshold = areaThreshold;
_minMargin = minMargin;
_edgeBlurSize = edgeBlurSize;
MCvMSERParams p = GetMSERParameters();
_featureDetectorPtr = CvMserGetFeatureDetector(ref p);
}
public static extern void cvExtractMSER(
IntPtr img,
IntPtr mask,
ref IntPtr contours,
IntPtr storage,
MCvMSERParams parameters);
internal extern static IntPtr CvMserGetFeatureDetector(ref MCvMSERParams detector);
internal static extern IntPtr CvMserGetFeatureDetector(ref MCvMSERParams detector);
