Struct NppiHOGConfig

The NppiHOGConfig structure defines the configuration parameters for the HOG descriptor

Inherited Members

System.ValueType.Equals(System.Object)

System.ValueType.GetHashCode()

System.ValueType.ToString()

System.Object.Equals(System.Object, System.Object)

System.Object.GetType()

System.Object.ReferenceEquals(System.Object, System.Object)

Namespace: ManagedCuda.NPP

Assembly: NPP.dll

Syntax

public struct NppiHOGConfig

Fields

cellSize

square cell size (pixels).

Declaration

public int cellSize

Field Value

Type	Description
System.Int32

detectionWindowSize

detection window size (pixels).

Declaration

public NppiSize detectionWindowSize

Field Value

Type	Description
NppiSize

histogramBlockSize

square histogram block size (pixels).

Declaration

public int histogramBlockSize

Field Value

Type	Description
System.Int32

nHistogramBins

required number of histogram bins.

Declaration

public int nHistogramBins

Field Value

Type	Description
System.Int32

Methods

HistogramOfGradientsBorderGetBufferSize(NppiPoint[], NppiSize)

Validates requested HOG configuration and calculates scratch buffer size needed for the HistogramOfGradientsBorder function based on requested HOG configuration, source image ROI, and number and locations of descriptor window locations.

Declaration

public int HistogramOfGradientsBorderGetBufferSize(NppiPoint[] hpLocations, NppiSize oSizeROI)

Parameters

Type	Name	Description
NppiPoint[]	hpLocations	Host pointer to array of NppiPoint source pixel starting locations of requested descriptor windows. Important: hpLocations is a
NppiSize	oSizeROI	Region-of-Interest (ROI) of source image.

Returns

Type	Description
System.Int32

HistogramOfGradientsBorderGetDescriptorsSize(Int32)

Validates requested HOG configuration and calculates output window descriptors buffer size needed for the HistogramOfGradientsBorder function based on requested HOG configuration, and number of descriptor window locations, one descriptor window is output for each location. Descriptor windows are located sequentially and contiguously in the descriptors buffer. The number of horizontal overlapping block histogram bins per descriptor window width is determined by (((oHOGConfig.detectionWindowSize.width / oHOGConfig.histogramBlockSize) /// 2) - 1) /// oHOGConfig.nHistogramBins. The number of vertical overlapping block histograms per descriptor window height is determined by (((oHOGConfig.detectionWindowSize.height / oHOGConfig.histogramBlockSize) /// 2) - 1) The offset of each descriptor window in the descriptors output buffer is therefore horizontal histogram bins per descriptor window width /// vertical histograms per descriptor window height floating point values relative to the previous descriptor window output.

Declaration

public int HistogramOfGradientsBorderGetDescriptorsSize(int nLocations)

Parameters

Type	Name	Description
System.Int32	nLocations	Number of NppiPoint in pLocations array.

Returns

Type	Description
System.Int32