 | HOGDescriptor Class |
HOG (Histogram-of-Oriented-Gradients) Descriptor and Object Detector
Inheritance HierarchyNamespace: OpenCvSharp
Assembly: OpenCvSharp (in OpenCvSharp.dll) Version: 1.0.0
SyntaxThe HOGDescriptor type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | HOGDescriptor |
Default constructor
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| HOGDescriptor(String) |
Construct from a file containing HOGDescriptor properties and coefficients for the linear SVM classifier.
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| HOGDescriptor(NullableSize, NullableSize, NullableSize, NullableSize, Int32, Int32, Double, HistogramNormType, Double, Boolean, Int32) |
Creates the HOG descriptor and detector.
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Properties| Name | Description | |
|---|---|---|
 | AllocatedMemory |
Gets or sets a memory address allocated by AllocMemory.
(Inherited from DisposableObject.) |
| AllocatedMemorySize |
Gets or sets the byte length of the allocated memory
(Inherited from DisposableObject.) |
 | BlockSize |
Block size in pixels. Align to cell size. Default value is Size(16,16).
|
| BlockStride |
Block stride. It must be a multiple of cell size. Default value is Size(8,8).
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| CellSize |
Cell size. Default value is Size(8,8).
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| CvPtr |
Native pointer of OpenCV structure
(Inherited from DisposableCvObject.) |
| DataHandle |
Gets or sets a handle which allocates using cvSetData.
(Inherited from DisposableObject.) |
| DerivAperture | |
| GammaCorrection |
Flag to specify whether the gamma correction preprocessing is required or not.
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| HistogramNormType |
HistogramNormType
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| IsDisposed |
Gets a value indicating whether this instance has been disposed.
(Inherited from DisposableObject.) |
| IsEnabledDispose |
Gets or sets a value indicating whether you permit disposing this instance.
(Inherited from DisposableObject.) |
| L2HysThreshold |
L2-Hys normalization method shrinkage.
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| Nbins |
Number of bins used in the calculation of histogram of gradients. Default value is 9.
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| NLevels |
Maximum number of detection window increases. Default value is 64
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| SignedGradient |
Indicates signed gradient will be used or not
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| WinSigma |
Gaussian smoothing window parameter.
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| WinSize |
Detection window size. Align to block size and block stride. Default value is Size(64,128).
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Methods| Name | Description | |
|---|---|---|
 | AllocGCHandle |
Pins the object to be allocated by cvSetData.
(Inherited from DisposableObject.) |
| AllocMemory |
Allocates the specified size of memory.
(Inherited from DisposableObject.) |
| CheckDetectorSize | |
| Compute |
Computes HOG descriptors of given image.
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| ComputeGradient |
Computes gradients and quantized gradient orientations.
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| Detect(Mat, Double, NullableSize, NullableSize, Point) |
Performs object detection without a multi-scale window.
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| Detect(Mat, Double, Double, NullableSize, NullableSize, Point) |
Performs object detection without a multi-scale window.
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| DetectMultiScale(Mat, Double, NullableSize, NullableSize, Double, Int32) |
Performs object detection with a multi-scale window.
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| DetectMultiScale(Mat, Double, Double, NullableSize, NullableSize, Double, Int32) |
Performs object detection with a multi-scale window.
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| DetectMultiScaleROI |
evaluate specified ROI and return confidence value for each location in multiple scales
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| DetectROI |
evaluate specified ROI and return confidence value for each location
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| Dispose |
Releases the resources
(Inherited from DisposableObject.) |
| Dispose(Boolean) |
Releases the resources
(Inherited from DisposableObject.) |
| DisposeManaged |
Releases managed resources
(Inherited from DisposableObject.) |
| DisposeUnmanaged |
Releases unmanaged resources
(Overrides DisposableCvObjectDisposeUnmanaged.) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Finalize |
Destructor
(Inherited from DisposableObject.) |
 | GetDaimlerPeopleDetector |
This method returns 1981 SVM coeffs obtained from daimler's base.
To use these coeffs the detection window size should be (48,96)
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| GetDefaultPeopleDetector |
Returns coefficients of the classifier trained for people detection (for default window size).
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| GetDescriptorSize | |
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| GetWinSigma | |
| GroupRectangles |
Groups the object candidate rectangles.
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| Load |
loads HOGDescriptor parameters and coefficients for the linear SVM classifier from a file.
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| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| NotifyMemoryPressure |
Notifies the allocated size of memory.
(Inherited from DisposableObject.) |
| Save |
saves HOGDescriptor parameters and coefficients for the linear SVM classifier to a file
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| SetSVMDetector |
Sets coefficients for the linear SVM classifier.
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| ThrowIfDisposed |
If this object is disposed, then ObjectDisposedException is thrown.
(Inherited from DisposableObject.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
Fields| Name | Description | |
|---|---|---|
 | DaimlerPeopleDetector |
This field returns 1981 SVM coeffs obtained from daimler's base.
To use these coeffs the detection window size should be (48,96)
|
| DefaultNlevels | |
| DefaultPeopleDetector |
Returns coefficients of the classifier trained for people detection (for default window size).
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| L2Hys | |
 | ptr |
Data pointer
(Inherited from DisposableCvObject.) |
See Also