Computer Vision

Intel® IPP implements image processing functions for computer vision. These functions are combined in groups by their functionality. Each group of functions is described separately.

Intel IPP Functions for Computer Vision Applications
Function Name	Description
Feature Detection Functions
CannyGetSize	Pre-calculates the size of the temporary buffer for the function ippiCanny.
Canny	Finds edges in the image.
EigenValsVecsGetBufferSize	Pre-calculates the size of the temporary buffer for the function ippiEigenValsVecs.
EigenValsVecs	Calculates eigen values and eigen vectors of image blocks for corner detection.
MinEigenValGetBufferSize	Pre-calculates the size of the temporary buffer for the function ippiCornerMinEigenVal.
MinEigenVal	Calculates the minimal eigen value of image blocks for corner detection.
HoughLineGetSize	Computes the size of the working buffer straight lines detection.
HoughLine	Detects straight lines in the source image.
HoughLine_Region	Detects straight lines with the specified range of parameters in the source image
Distance Transform Functions
DistanceTransform	Performs the distance transform operation.
GetDistanceTransformMask	Calculates metrics for distance transform.
TrueDistanceTransformGetBufferSize	Calculates the size of the temporary working buffer for the function ippiTrueDistanceTransform.
TrueDistanceTransform	Calculates the Eucledian distance to the closest zero pixel for all non-zero pixels of the source image.
FastMarchingGetBufferSize	Computes the size of the working buffer for the peak search.
FastMarching	Calculates distance transform to closest zero pixel for all non-zero pixels of source image using fast marching method.
Image Gradients
GradientColorToGray	Converts a color gradient image to grayscale.
Flood Fill Functions
FloodFillGetSize	Calculates size of temporary buffer for flood filling operation.
FloodFillGetSize_Grad	Calculates size of temporary buffer for the gradient flood filling.
FloodFill	Fills the connected area of the same pixel values on the image with a new value, considering 4 or 8 neighbor values of the pixel.
FloodFill_Grad	Fills the connected area of the pixel values within a small threshold on the image with a new value, considering 4 or 8 neighbor values of the pixel.
FloodFill_Range	Fills the connected region of the pixel values within a specified range on the image with a new value, considering 4 neighbor values of the pixel
Motion Templates Functions
UpdateMotionHistory	Updates the motion history image using the motion silhouette at a given timestamp.
OpticalFlowPyrLKInitAlloc	Allocates memory and initializes a structure for optical flow calculation.
OpticalFlowPyrLKFree	Frees memory allocated for the optical flow structure.
OpticalFlowPyrLK	Calculates optical flow for the set of feature points using the pyramidal Lucas-Kanade algorithm.
Pyramids Functions
PyrDownGetBufSize	Calculates the size of a temporary buffer used by the function PyrDown.
PyrUpGetBufSize	Calculates the size of a temporary buffer used by the function PyrUp.
PyrDown	Applies the Gaussian to an image, then performs down-sampling.
PyrUp	Performs up-sampling of an image, then applies the Gaussian multiplied by 4.
Universal Pyramids Functions
PyramidInitAlloc	Allocates memory and initializes a pyramid structure.
PyramidFree	Frees memory allocated for the pyramid structure.
PyramidLayerDownInitAlloc	Allocates memory and initializes a structure for creating a lower pyramid layer.
PyramidLayerUpInitAlloc	Allocates memory and initializes a structure for creating an upper pyramid layer.
PyramidLayerDownFree	Frees memory allocated for the lower pyramid layer structure.
PyramidLayerUpFree	Frees memory allocated for the upper pyramid layer structure.
GetPyramidDownROI	Computes the size of the lower pyramid layer.
GetPyramidUpROI	Computes the size of the upper pyramid layer.
PyramidLayerDown	Creates a lower pyramid layer.
PyramidLayerUp	Creates an upper pyramid layer.
Image Inpainting Functions
InpaintInitAlloc	Allocates memory and initializes a structure for image inpainting.
InpaintFree	Frees memory allocated for the structure for image inpainting.
Inpaint	Restorse unknown image pixels.
Image Segmentation Functions
LabelMarkersGetBufferSize	Computes the size of the working buffer for the marker labeling.
LabelMarkers	Labels markers in image with different values.
SegmentWatershedGetBufferSize	Computes the size of the working buffer for the watershed segmentation.
SegmentWatershed	Performs watershed image segmentation using markers.
SegmentGradientGetBufferSize	Computes the size of the working buffer for the gradient segmentation.
SegmentGradient	Performs image segmentation by region growing to the least gradient direction.
BoundSegments	Marks pixels belonging to segment boundaries.
ForegroundHistogramInitAlloc	Allocates memory and initializes a state structure for foreground and background segmentation using histograms.
ForegroundHistogramFree	Frees memory allocated for the foreground and background segmentation structure.
ForegroundHistogram	Calculates foreground mask using histograms.
ForegroundHistogramUpdate	Updates histogram statistical model for foreground segmentation.
ForegroundGaussianInitAlloc	Allocates memory and initializes a state structure for foreground/background segmentation using Gaussian mixtures.
ForegroundGaussianFree	Frees memory allocated for foreground/background segmentation using Gaussian mixtures.
ForegroundGaussian	Performs foreground/background segmentation using Gaussian mixtures.
Pattern Recognition Functions
HaarClassifierInitAlloc	Allocates memory and initializes the structure for standard Haar classifiers.
TiltedHaarClassifierInitAlloc	Allocates memory and initializes the structure for tilted Haar classifiers.
HaarClassifierFree	Frees memory allocated for the Haar classifier structure.
GetHaarClassifierSize	Returns the size of the Haar classifier.
TiltHaarFeatures	Modifies a Haar classifier by tilting specified features.
ApplyHaarClassifier	Applies a Haar classifier to an image.
ApplyMixedHaarClassifier	Applies a mixed Haar classifier to an image.
Camera Calibration and 3D Reconstruction
UndistortGetSize	Computes the size of the external buffer.
UndistortRadial	Corrects radial distortions of the single image.
CreateMapCameraUndistort	Creates look-up tables of coordinates of corrected image.
Image Enchancement Functions
SRHNInitAlloc_PSF3x3, SRHNInitAlloc_PSF2x2	Allocates memory and initializes the internal representation of the PSF table.
SRHNFree_PSF3x3, SRHNFree_PSF3x3	Deallocates the internal representation of the PSF table.
SRHNCalcResidual_PSF3x3, SRHNCalcResidual_PSF2x2	Computes residuals for the likelihood part of the target function or its gradient.
SRHNUpdateGradient_PSF3x3, SRHNUpdateGradient_PSF2x2	Updates the likelihood part of the gradient.