C# Class Emgu.CV.HaarCascade

Inheritance: Emgu.Util.UnmanagedObject
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Public Methods

Method Description
Detect ( Byte>.Image image ) : Emgu.CV.Structure.MCvAvgComp[]

Detect HaarCascade object in the given image, using predefined parameters
Detect ( Byte>.Image image, double scaleFactor, int minNeighbors, CvEnum flag, Size minSize, Size maxSize ) : Emgu.CV.Structure.MCvAvgComp[]

Finds rectangular regions in the given image that are likely to contain objects the cascade has been trained for and returns those regions as a sequence of rectangles. The function scans the image several times at different scales (see cvSetImagesForHaarClassifierCascade). Each time it considers overlapping regions in the image and applies the classifiers to the regions using cvRunHaarClassifierCascade. It may also apply some heuristics to reduce number of analyzed regions, such as Canny prunning. After it has proceeded and collected the candidate rectangles (regions that passed the classifier cascade), it groups them and returns a sequence of average rectangles for each large enough group. The default parameters (scale_factor=1.1, min_neighbors=3, flags=0) are tuned for accurate yet slow object detection. For a faster operation on real video images the settings are: scale_factor=1.2, min_neighbors=2, flags=CV_HAAR_DO_CANNY_PRUNING, min_size=<minimum possible face size> (for example, ~1/4 to 1/16 of the image area in case of video conferencing).
HaarCascade ( String fileName ) : System

Create a HaarCascade object from the specific file

Protected Methods

Method Description
DisposeObject ( ) : void

Release the HaarCascade Object and all the memory associate with it

Method Details

Detect() public method

Detect HaarCascade object in the given image, using predefined parameters
public Detect ( Byte>.Image image ) : Emgu.CV.Structure.MCvAvgComp[]
image Byte>.Image The image where the objects are to be detected from
return Emgu.CV.Structure.MCvAvgComp[]

Detect() public method

Finds rectangular regions in the given image that are likely to contain objects the cascade has been trained for and returns those regions as a sequence of rectangles. The function scans the image several times at different scales (see cvSetImagesForHaarClassifierCascade). Each time it considers overlapping regions in the image and applies the classifiers to the regions using cvRunHaarClassifierCascade. It may also apply some heuristics to reduce number of analyzed regions, such as Canny prunning. After it has proceeded and collected the candidate rectangles (regions that passed the classifier cascade), it groups them and returns a sequence of average rectangles for each large enough group. The default parameters (scale_factor=1.1, min_neighbors=3, flags=0) are tuned for accurate yet slow object detection. For a faster operation on real video images the settings are: scale_factor=1.2, min_neighbors=2, flags=CV_HAAR_DO_CANNY_PRUNING, min_size=<minimum possible face size> (for example, ~1/4 to 1/16 of the image area in case of video conferencing).
public Detect ( Byte>.Image image, double scaleFactor, int minNeighbors, CvEnum flag, Size minSize, Size maxSize ) : Emgu.CV.Structure.MCvAvgComp[]
image Byte>.Image The image where the objects are to be detected from
scaleFactor double The factor by which the search window is scaled between the subsequent scans, for example, 1.1 means increasing window by 10%
minNeighbors int Minimum number (minus 1) of neighbor rectangles that makes up an object. All the groups of a smaller number of rectangles than min_neighbors-1 are rejected. If min_neighbors is 0, the function does not any grouping at all and returns all the detected candidate rectangles, which may be useful if the user wants to apply a customized grouping procedure
flag CvEnum Mode of operation. Currently the only flag that may be specified is CV_HAAR_DO_CANNY_PRUNING. If it is set, the function uses Canny edge detector to reject some image regions that contain too few or too much edges and thus can not contain the searched object. The particular threshold values are tuned for face detection and in this case the pruning speeds up the processing.
minSize System.Drawing.Size Minimum window size. Use Size.Empty for default, where it is set to the size of samples the classifier has been trained on (~20x20 for face detection)
maxSize System.Drawing.Size Maxumum window size. Use Size.Empty for default, where the parameter will be ignored.
return Emgu.CV.Structure.MCvAvgComp[]

DisposeObject() protected method

Release the HaarCascade Object and all the memory associate with it
protected DisposeObject ( ) : void
return void

HaarCascade() public method

Create a HaarCascade object from the specific file
public HaarCascade ( String fileName ) : System
fileName String The name of the file that contains the HaarCascade object
return System