Collaboration diagram for Interface:

Modules
	Element-wise add and subtract
	Add: dst[i] = src1[i] + src2[i] Sub: dst[i] = src1[i] - src2[i]

	Element-wise minimum or maximum
	Minimum: dst[i] = min(src1[i], src2[i]) Maximum: dst[i] = max(src1[i], src2[i])

	Element-wise absolute difference
	Absolute difference: dst[i] = \| src1[i] - src2[i] \|

	Bitwise logical operations
	Bitwise AND: dst[i] = src1[i] & src2[i] Bitwise OR: dst[i] = src1[i] \| src2[i] Bitwise XOR: dst[i] = src1[i] ^ src2[i] Bitwise NOT: dst[i] = !src[i]

	Element-wise compare
	Compare: dst[i] = src1[i] op src2[i]

	Element-wise multiply
	Multiply: dst[i] = scale src1[i] * src2[i]*

	Element-wise divide
	Divide: dst[i] = scale src1[i] / src2[i]*

	Element-wise reciprocial
	Computes reciprocial: dst[i] = scale / src[i]

	Element-wise weighted sum
	Computes weighted sum of two arrays using formula: dst[i] = a src1[i] + b * src2[i] + c*

	Channel split

	Channel merge

	Atan calculation

	Magnitude calculation

	Inverse square root calculation

	Square root calculation

	Natural logarithm calculation

	Exponent calculation

	LU matrix decomposition
	Performs \(LU\) decomposition of square matrix \(A=PLU\) (where \(P\) is permutation matrix) and solves matrix equation \(A*X=B\).

	Cholesky matrix decomposition
	Performs Cholesky decomposition of matrix \(A = LL^T\) and solves matrix equation \(AX=B\).

	Singular value matrix decomposition
	Performs singular value decomposition of \(M\times N\)( \(M>N\)) matrix \(A = U\SigmaV^T\).

	QR matrix decomposition
	Performs QR decomposition of \(M\times N\)( \(M>N\)) matrix \(A = QR\) and solves matrix equation \(AX=B\).

	Matrix multiplication
	The function performs generalized matrix multiplication similar to the gemm functions in BLAS level 3: \(D = \alphaAB+\betaC\).

Classes
struct	cvhalDFT
	Dummy structure storing DFT/DCT context. More...

Functions
int	hal_ni_dct2D (cvhalDFT context, const uchar src_data, size_t src_step, uchar *dst_data, size_t dst_step)

int	hal_ni_dctFree2D (cvhalDFT *context)

int	hal_ni_dctInit2D (cvhalDFT **context, int width, int height, int depth, int flags)

int	hal_ni_dft1D (cvhalDFT context, const uchar src, uchar *dst)

int	hal_ni_dft2D (cvhalDFT context, const uchar src_data, size_t src_step, uchar *dst_data, size_t dst_step)

int	hal_ni_dftFree1D (cvhalDFT *context)

int	hal_ni_dftFree2D (cvhalDFT *context)

int	hal_ni_dftInit1D (cvhalDFT *context, int len, int count, int depth, int flags, bool needBuffer)

int	hal_ni_dftInit2D (cvhalDFT **context, int width, int height, int depth, int src_channels, int dst_channels, int flags, int nonzero_rows)

int	hal_ni_minMaxIdx (const uchar src_data, size_t src_step, int width, int height, int depth, double minVal, double maxVal, int minIdx, int maxIdx, uchar mask)
	Finds the global minimum and maximum in an array. More...

Return codes
#define	CV_HAL_ERROR_OK 0

#define	CV_HAL_ERROR_NOT_IMPLEMENTED 1

#define	CV_HAL_ERROR_UNKNOWN -1

Data types
primitive types schar - signed 1 byte integer uchar - unsigned 1 byte integer short - signed 2 byte integer ushort - unsigned 2 byte integer int - signed 4 byte integer uint - unsigned 4 byte integer int64 - signed 8 byte integer uint64 - unsigned 8 byte integer
typedef uint32_t	uint

typedef signed char	schar

typedef unsigned char	uchar

typedef unsigned short	ushort

typedef int64_t	int64

typedef uint64_t	uint64

#define	CV_BIG_INT(n) n##LL

#define	CV_BIG_UINT(n) n##ULL

#define	CV_USRTYPE1 (void)"CV_USRTYPE1 support has been dropped in OpenCV 4.0"

#define	CV_CN_MAX 512

#define	CV_CN_SHIFT 3

#define	CV_DEPTH_MAX (1 << CV_CN_SHIFT)

#define	CV_8U 0

#define	CV_8S 1

#define	CV_16U 2

#define	CV_16S 3

#define	CV_32S 4

#define	CV_32F 5

#define	CV_64F 6

#define	CV_16F 7

#define	CV_MAT_DEPTH_MASK (CV_DEPTH_MAX - 1)

#define	CV_MAT_DEPTH(flags) ((flags) & CV_MAT_DEPTH_MASK)

#define	CV_MAKETYPE(depth, cn) (CV_MAT_DEPTH(depth) + (((cn)-1) << CV_CN_SHIFT))

#define	CV_MAKE_TYPE CV_MAKETYPE

#define	CV_8UC1 CV_MAKETYPE(CV_8U,1)

#define	CV_8UC2 CV_MAKETYPE(CV_8U,2)

#define	CV_8UC3 CV_MAKETYPE(CV_8U,3)

#define	CV_8UC4 CV_MAKETYPE(CV_8U,4)

#define	CV_8UC(n) CV_MAKETYPE(CV_8U,(n))

#define	CV_8SC1 CV_MAKETYPE(CV_8S,1)

#define	CV_8SC2 CV_MAKETYPE(CV_8S,2)

#define	CV_8SC3 CV_MAKETYPE(CV_8S,3)

#define	CV_8SC4 CV_MAKETYPE(CV_8S,4)

#define	CV_8SC(n) CV_MAKETYPE(CV_8S,(n))

#define	CV_16UC1 CV_MAKETYPE(CV_16U,1)

#define	CV_16UC2 CV_MAKETYPE(CV_16U,2)

#define	CV_16UC3 CV_MAKETYPE(CV_16U,3)

#define	CV_16UC4 CV_MAKETYPE(CV_16U,4)

#define	CV_16UC(n) CV_MAKETYPE(CV_16U,(n))

#define	CV_16SC1 CV_MAKETYPE(CV_16S,1)

#define	CV_16SC2 CV_MAKETYPE(CV_16S,2)

#define	CV_16SC3 CV_MAKETYPE(CV_16S,3)

#define	CV_16SC4 CV_MAKETYPE(CV_16S,4)

#define	CV_16SC(n) CV_MAKETYPE(CV_16S,(n))

#define	CV_32SC1 CV_MAKETYPE(CV_32S,1)

#define	CV_32SC2 CV_MAKETYPE(CV_32S,2)

#define	CV_32SC3 CV_MAKETYPE(CV_32S,3)

#define	CV_32SC4 CV_MAKETYPE(CV_32S,4)

#define	CV_32SC(n) CV_MAKETYPE(CV_32S,(n))

#define	CV_32FC1 CV_MAKETYPE(CV_32F,1)

#define	CV_32FC2 CV_MAKETYPE(CV_32F,2)

#define	CV_32FC3 CV_MAKETYPE(CV_32F,3)

#define	CV_32FC4 CV_MAKETYPE(CV_32F,4)

#define	CV_32FC(n) CV_MAKETYPE(CV_32F,(n))

#define	CV_64FC1 CV_MAKETYPE(CV_64F,1)

#define	CV_64FC2 CV_MAKETYPE(CV_64F,2)

#define	CV_64FC3 CV_MAKETYPE(CV_64F,3)

#define	CV_64FC4 CV_MAKETYPE(CV_64F,4)

#define	CV_64FC(n) CV_MAKETYPE(CV_64F,(n))

#define	CV_16FC1 CV_MAKETYPE(CV_16F,1)

#define	CV_16FC2 CV_MAKETYPE(CV_16F,2)

#define	CV_16FC3 CV_MAKETYPE(CV_16F,3)

#define	CV_16FC4 CV_MAKETYPE(CV_16F,4)

#define	CV_16FC(n) CV_MAKETYPE(CV_16F,(n))

Comparison operation
See also cv::CmpTypes
#define	CV_HAL_CMP_EQ 0

#define	CV_HAL_CMP_GT 1

#define	CV_HAL_CMP_GE 2

#define	CV_HAL_CMP_LT 3

#define	CV_HAL_CMP_LE 4

#define	CV_HAL_CMP_NE 5

Border processing modes
See also cv::BorderTypes
#define	CV_HAL_BORDER_CONSTANT 0

#define	CV_HAL_BORDER_REPLICATE 1

#define	CV_HAL_BORDER_REFLECT 2

#define	CV_HAL_BORDER_WRAP 3

#define	CV_HAL_BORDER_REFLECT_101 4

#define	CV_HAL_BORDER_TRANSPARENT 5

#define	CV_HAL_BORDER_ISOLATED 16

DFT flags
#define	CV_HAL_DFT_INVERSE 1

#define	CV_HAL_DFT_SCALE 2

#define	CV_HAL_DFT_ROWS 4

#define	CV_HAL_DFT_COMPLEX_OUTPUT 16

#define	CV_HAL_DFT_REAL_OUTPUT 32

#define	CV_HAL_DFT_TWO_STAGE 64

#define	CV_HAL_DFT_STAGE_COLS 128

#define	CV_HAL_DFT_IS_CONTINUOUS 512

#define	CV_HAL_DFT_IS_INPLACE 1024

SVD flags
#define	CV_HAL_SVD_NO_UV 1

#define	CV_HAL_SVD_SHORT_UV 2

#define	CV_HAL_SVD_MODIFY_A 4

#define	CV_HAL_SVD_FULL_UV 8

Gemm flags
#define	CV_HAL_GEMM_1_T 1

#define	CV_HAL_GEMM_2_T 2

#define	CV_HAL_GEMM_3_T 4

Detailed Description

Note: Define your functions to override default implementations:
#undef hal_add8u
#define hal_add8u my_add8u