This is the proxy class for passing read-only input arrays into OpenCV functions. More...

#include "mat.hpp"

Inheritance diagram for cv::_InputArray:

Public Types
enum	{ KIND_SHIFT = 16, FIXED_TYPE = 0x8000 << KIND_SHIFT, FIXED_SIZE = 0x4000 << KIND_SHIFT, KIND_MASK = 31 << KIND_SHIFT, NONE = 0 << KIND_SHIFT, MAT = 1 << KIND_SHIFT, MATX = 2 << KIND_SHIFT, STD_VECTOR = 3 << KIND_SHIFT, STD_VECTOR_VECTOR = 4 << KIND_SHIFT, STD_VECTOR_MAT = 5 << KIND_SHIFT, EXPR = 6 << KIND_SHIFT, OPENGL_BUFFER = 7 << KIND_SHIFT, CUDA_HOST_MEM = 8 << KIND_SHIFT, CUDA_GPU_MAT = 9 << KIND_SHIFT, UMAT =10 << KIND_SHIFT, STD_VECTOR_UMAT =11 << KIND_SHIFT }

Public Member Functions
	_InputArray ()

	_InputArray (int _flags, void *_obj)

	_InputArray (const Mat &m)

	_InputArray (const MatExpr &expr)

	_InputArray (const std::vector< Mat > &vec)

template<typename _Tp >
	_InputArray (const Mat_< _Tp > &m)

template<typename _Tp >
	_InputArray (const std::vector< _Tp > &vec)

template<typename _Tp >
	_InputArray (const std::vector< std::vector< _Tp > > &vec)

template<typename _Tp >
	_InputArray (const std::vector< Mat_< _Tp > > &vec)

template<typename _Tp >
	_InputArray (const _Tp *vec, int n)

template<typename _Tp , int m, int n>
	_InputArray (const Matx< _Tp, m, n > &matx)

	_InputArray (const double &val)

	_InputArray (const cuda::GpuMat &d_mat)

	_InputArray (const ogl::Buffer &buf)

	_InputArray (const cuda::HostMem &cuda_mem)

template<typename _Tp >
	_InputArray (const cudev::GpuMat_< _Tp > &m)

	_InputArray (const UMat &um)

	_InputArray (const std::vector< UMat > &umv)

	~_InputArray ()

int	channels (int i=-1) const

int	cols (int i=-1) const

void	copyTo (const _OutputArray &arr) const

void	copyTo (const _OutputArray &arr, const _InputArray &mask) const

int	depth (int i=-1) const

int	dims (int i=-1) const

bool	empty () const

int	getFlags () const

cuda::GpuMat	getGpuMat () const

Mat	getMat (int idx=-1) const

Mat	getMat_ (int idx=-1) const

void	getMatVector (std::vector< Mat > &mv) const

void *	getObj () const

ogl::Buffer	getOGlBuffer () const

Size	getSz () const

UMat	getUMat (int idx=-1) const

void	getUMatVector (std::vector< UMat > &umv) const

bool	isContinuous (int i=-1) const

bool	isMat () const

bool	isMatVector () const

bool	isMatx () const

bool	isSubmatrix (int i=-1) const

bool	isUMat () const

bool	isUMatVector () const

int	kind () const

size_t	offset (int i=-1) const

int	rows (int i=-1) const

bool	sameSize (const _InputArray &arr) const

Size	size (int i=-1) const

int	sizend (int *sz, int i=-1) const

size_t	step (int i=-1) const

size_t	total (int i=-1) const

int	type (int i=-1) const

Protected Member Functions
void	init (int _flags, const void *_obj)

void	init (int _flags, const void *_obj, Size _sz)

Protected Attributes
int	flags

void *	obj

Size	sz

Detailed Description

This is the proxy class for passing read-only input arrays into OpenCV functions.

It is defined as:

typedef const _InputArray& InputArray;

where _InputArray is a class that can be constructed from Mat, Mat_<T>, Matx<T, m, n>, std::vector<T>, std::vector<std::vector<T> > or std::vector<Mat>. It can also be constructed from a matrix expression.

Since this is mostly implementation-level class, and its interface may change in future versions, we do not describe it in details. There are a few key things, though, that should be kept in mind:

When you see in the reference manual or in OpenCV source code a function that takes InputArray, it means that you can actually pass Mat, Matx, vector<T> etc. (see above the complete list).
Optional input arguments: If some of the input arrays may be empty, pass cv::noArray() (or simply cv::Mat() as you probably did before).
The class is designed solely for passing parameters. That is, normally you should not declare class members, local and global variables of this type.
If you want to design your own function or a class method that can operate of arrays of multiple types, you can use InputArray (or OutputArray) for the respective parameters. Inside a function you should use _InputArray::getMat() method to construct a matrix header for the array (without copying data). _InputArray::kind() can be used to distinguish Mat from vector<> etc., but normally it is not needed.

Here is how you can use a function that takes InputArray :

std::vector<Point2f> vec;
// points or a circle
for( int i = 0; i < 30; i++ )
    vec.push_back(Point2f((float)(100 + 30*cos(i*CV_PI*2/5)),
                          (float)(100 - 30*sin(i*CV_PI*2/5))));
cv::transform(vec, vec, cv::Matx23f(0.707, -0.707, 10, 0.707, 0.707, 20));

That is, we form an STL vector containing points, and apply in-place affine transformation to the vector using the 2x3 matrix created inline as Matx<float, 2, 3> instance.

Here is how such a function can be implemented (for simplicity, we implement a very specific case of it, according to the assertion statement inside) :

void myAffineTransform(InputArray _src, OutputArray _dst, InputArray _m)
{
    // get Mat headers for input arrays. This is O(1) operation,
    // unless _src and/or _m are matrix expressions.
    Mat src = _src.getMat(), m = _m.getMat();
    CV_Assert( src.type() == CV_32FC2 && m.type() == CV_32F && m.size() == Size(3, 2) );
    // [re]create the output array so that it has the proper size and type.
    // In case of Mat it calls Mat::create, in case of STL vector it calls vector::resize.
    _dst.create(src.size(), src.type());
    Mat dst = _dst.getMat();
    for( int i = 0; i < src.rows; i++ )
        for( int j = 0; j < src.cols; j++ )
        {
            Point2f pt = src.at<Point2f>(i, j);
            dst.at<Point2f>(i, j) = Point2f(m.at<float>(0, 0)*pt.x +
                                            m.at<float>(0, 1)*pt.y +
                                            m.at<float>(0, 2),
                                            m.at<float>(1, 0)*pt.x +
                                            m.at<float>(1, 1)*pt.y +
                                            m.at<float>(1, 2));
        }
}

There is another related type, InputArrayOfArrays, which is currently defined as a synonym for InputArray:

typedef InputArray InputArrayOfArrays;

It denotes function arguments that are either vectors of vectors or vectors of matrices. A separate synonym is needed to generate Python/Java etc. wrappers properly. At the function implementation level their use is similar, but _InputArray::getMat(idx) should be used to get header for the idx-th component of the outer vector and _InputArray::size().area() should be used to find the number of components (vectors/matrices) of the outer vector.

Examples:: pca.cpp.

Member Enumeration Documentation

anonymous enum

Enumerator
KIND_SHIFT
FIXED_TYPE
FIXED_SIZE
KIND_MASK
NONE
MAT
MATX
STD_VECTOR
STD_VECTOR_VECTOR
STD_VECTOR_MAT
EXPR
OPENGL_BUFFER
CUDA_HOST_MEM
CUDA_GPU_MAT
UMAT
STD_VECTOR_UMAT

Constructor & Destructor Documentation

cv::_InputArray::_InputArray ( )

cv::_InputArray::_InputArray	(	int	_flags,
		void *	_obj
	)

cv::_InputArray::_InputArray ( const Mat & m )

cv::_InputArray::_InputArray ( const MatExpr & expr )

cv::_InputArray::_InputArray ( const std::vector< Mat > & vec )

template<typename _Tp >

cv::_InputArray::_InputArray ( const Mat_< _Tp > & m )

template<typename _Tp >

cv::_InputArray::_InputArray ( const std::vector< _Tp > & vec )

template<typename _Tp >

cv::_InputArray::_InputArray ( const std::vector< std::vector< _Tp > > & vec )

template<typename _Tp >

cv::_InputArray::_InputArray ( const std::vector< Mat_< _Tp > > & vec )

template<typename _Tp >

cv::_InputArray::_InputArray	(	const _Tp *	vec,
		int	n
	)

template<typename _Tp , int m, int n>

cv::_InputArray::_InputArray ( const Matx< _Tp, m, n > & matx )

cv::_InputArray::_InputArray ( const double & val )

cv::_InputArray::_InputArray ( const cuda::GpuMat & d_mat )

cv::_InputArray::_InputArray ( const ogl::Buffer & buf )

cv::_InputArray::_InputArray ( const cuda::HostMem & cuda_mem )

template<typename _Tp >

cv::_InputArray::_InputArray ( const cudev::GpuMat_< _Tp > & m )

cv::_InputArray::_InputArray ( const UMat & um )

cv::_InputArray::_InputArray ( const std::vector< UMat > & umv )

cv::_InputArray::~_InputArray ( )

Member Function Documentation

int cv::_InputArray::channels ( int i = -1 ) const

int cv::_InputArray::cols ( int i = -1 ) const

void cv::_InputArray::copyTo ( const _OutputArray & arr ) const

void cv::_InputArray::copyTo	(	const _OutputArray &	arr,
		const _InputArray &	mask
	)		const

int cv::_InputArray::depth ( int i = -1 ) const

int cv::_InputArray::dims ( int i = -1 ) const

bool cv::_InputArray::empty ( ) const

int cv::_InputArray::getFlags ( ) const

cuda::GpuMat cv::_InputArray::getGpuMat ( ) const

Mat cv::_InputArray::getMat ( int idx = -1 ) const

Examples:: pca.cpp.

Mat cv::_InputArray::getMat_ ( int idx = -1 ) const

void cv::_InputArray::getMatVector ( std::vector< Mat > & mv ) const

void* cv::_InputArray::getObj ( ) const

ogl::Buffer cv::_InputArray::getOGlBuffer ( ) const

Size cv::_InputArray::getSz ( ) const

UMat cv::_InputArray::getUMat ( int idx = -1 ) const

void cv::_InputArray::getUMatVector ( std::vector< UMat > & umv ) const

void cv::_InputArray::init	(	int	_flags,
		const void *	_obj
	)

protected

void cv::_InputArray::init	(	int	_flags,
		const void *	_obj,
		Size	_sz
	)

protected

bool cv::_InputArray::isContinuous ( int i = -1 ) const

bool cv::_InputArray::isMat ( ) const

bool cv::_InputArray::isMatVector ( ) const

bool cv::_InputArray::isMatx ( ) const

bool cv::_InputArray::isSubmatrix ( int i = -1 ) const

bool cv::_InputArray::isUMat ( ) const

bool cv::_InputArray::isUMatVector ( ) const

int cv::_InputArray::kind ( ) const

size_t cv::_InputArray::offset ( int i = -1 ) const

int cv::_InputArray::rows ( int i = -1 ) const

bool cv::_InputArray::sameSize ( const _InputArray & arr ) const

Size cv::_InputArray::size ( int i = -1 ) const

int cv::_InputArray::sizend	(	int *	sz,
		int	i = `-1`
	)		const

size_t cv::_InputArray::step ( int i = -1 ) const

size_t cv::_InputArray::total ( int i = -1 ) const

int cv::_InputArray::type ( int i = -1 ) const

Member Data Documentation

int cv::_InputArray::flags

protected

void* cv::_InputArray::obj

protected

Size cv::_InputArray::sz

protected

The documentation for this class was generated from the following file:

core/include/opencv2/core/mat.hpp

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation