Class HaarClassifierCascade

Represents a cascade or tree of boosted Haar stage classifiers.

Inheritance
Object
CVHandle
HaarClassifierCascade
Namespace: OpenCV.Net
Assembly: OpenCV.Net.dll
Syntax
public class HaarClassifierCascade : CVHandle

Methods

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DetectObjects(Arr, MemStorage, Double, Int32, HaarDetectObjectFlags, Size, Size)

Detects objects in the image.

Declaration
public Seq DetectObjects(Arr image, MemStorage storage, double scaleFactor = 1.1, int minNeighbors = 3, HaarDetectObjectFlags flags = default(HaarDetectObjectFlags), Size minSize = default(Size), Size maxSize = default(Size))
Parameters
Type Name Description
Arr image

Image to detect objects in.
MemStorage storage

Memory storage to store the resultant sequence of the object candidate rectangles.
Double scaleFactor

The factor by which the search window is scaled between the subsequent scans, 1.1 means increasing window by 10%.
Int32 minNeighbors

Minimum number (minus 1) of neighbor rectangles that make up an object. All the groups of a smaller number of rectangles than minNeighbors-1 are rejected. If it is 0, the method does not do 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.
HaarDetectObjectFlags flags

Mode of operation.
Size minSize

Minimum window size. By default, it is set to the size of samples the classifier has been trained on (20x20 for face detection).
Size maxSize

Maximum window size. By default, it is set to the total image size.
Returns
Type Description
Seq

The sequence of grouped (or ungrouped) object rectangles.
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Load(String)

Loads a boosted Haar classifier cascade from a file. This method ensures that all dependencies are loaded and is a temporary workaround to ensure Load<TElement>(String, MemStorage, String) does not throw an error.

Declaration
public static HaarClassifierCascade Load(string fileName)
Parameters
Type Name Description
String fileName

The path to the trained classifier cascade.
Returns
Type Description
HaarClassifierCascade

A new instance of the HaarClassifierCascade class.
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ReleaseHandle()

Executes the code required to free the native HaarClassifierCascade handle.

Declaration
protected override bool ReleaseHandle()
Returns
Type Description
Boolean

true if the handle is released successfully; otherwise, in the event of a catastrophic failure, false.