UMat class
Constructors
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UMat.create({int rows = 0, int cols = 0, int r = 0, int g = 0, int b = 0, MatType? type, UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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constructs 2D matrix and fills it with the specified value.
factory
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UMat.diag(UMat umat, {UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
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UMat.empty({UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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create an empty UMat
factory
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UMat.eye({int rows = 0, int cols = 0, MatType type = MatType.CV_8UC1, UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
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UMat.fromPointer(UMatPtr mat, {bool attach = true, int? externalSize})
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construct from pointer directly
factory
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UMat.fromRange(UMat umat, {int rowStart = 0, int? rowEnd, int colStart = 0, int? colEnd})
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creates a matrix header for a part of the bigger matrix
factory
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UMat.fromRect(UMat umat, Rect roi)
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UMat(const UMat& m, const Rect& roi);
factory
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UMat.fromUMat(UMat umat)
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copy constructor
factory
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UMat.nd(List<int> sizes, MatType type, {Scalar? s, UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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constructs n-dimensional matrix
factory
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UMat.ones(int rows, int cols, MatType type, {UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
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UMat.onesND(List<int> sizes, MatType type, {UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
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UMat.zeros({int rows = 0, int cols = 0, MatType type = MatType.CV_8UC1, UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
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UMat.zerosND(List<int> sizes, MatType type, {UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
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factory
Properties
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channels
→ int
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returns element type, similar to CV_MAT_CN(cvmat->type)
no setter
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cols
→ int
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number of columns in the matrix; -1 when the matrix has more than 2 dimensions
no setter
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depth
→ int
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returns element type, similar to CV_MAT_DEPTH(cvmat->type)
no setter
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dims
→ int
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the matrix dimensionality, >= 2
no setter
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elemSize
→ int
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returns element size in bytes,
no setter
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elemSize1
→ int
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returns the size of element channel in bytes.
no setter
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empty
→ bool
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returns true if matrix data is NULL
no setter
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flags
→ int
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includes several bit-fields:
no setter
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hashCode
→ int
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The hash code for this object.
no setterinherited
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isContinuous
→ bool
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returns true iff the matrix data is continuous
no setter
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isEmpty
→ bool
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returns true if matrix data is NULL
no setter
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isSubmatrix
→ bool
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returns true if the matrix is a submatrix of another matrix
no setter
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offset
→ int
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offset of the submatrix (or 0)
no setter
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props
→ List<Object?>
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no setterinherited
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ptr
↔ Pointer<UMat>
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getter/setter pairinherited
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ref
→ UMat
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no setteroverride
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rows
→ int
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number of rows in the matrix; -1 when the matrix has more than 2 dimensions
no setter
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runtimeType
→ Type
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A representation of the runtime type of the object.
no setterinherited
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size
→ VecI32
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dimensional size of the matrix; accessible in various formats
no setter
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step
→ (int, int, int)
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number of bytes each matrix element/row/plane/dimension occupies
no setter
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total
→ int
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returns the total number of matrix elements
no setter
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type
→ MatType
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returns element type, similar to CV_MAT_TYPE(cvmat->type)
no setter
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usageFlags
→ int
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usage flags for allocator; recommend do not set directly, instead set during construct/create/getUMat
no setter
Methods
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addref()
→ void
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increases the reference counter; use with care to avoid memleaks
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checkVector(int elemChannels, {int depth = -1, bool requireContinuous = true})
→ int
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returns N if the matrix is 1-channel (N x ptdim) or ptdim-channel (1 x N) or (N x 1); negative number otherwise
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clone()
→ UMat
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returns deep copy of the matrix, i.e. the data is copied
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col(int i)
→ UMat
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returns a new matrix header for the specified column
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colRange(int start, int end)
→ UMat
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... for the specified column span
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convertTo(MatType type, {UMat? dst, double alpha = 1, double beta = 0})
→ UMat
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converts matrix to another datatype with optional scaling.
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copyTo(UMat dst, {UMat? mask})
→ void
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copies those matrix elements to "m" that are marked with non-zero mask elements.
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create(List<int> sizes, MatType type, {UMatUsageFlags flags = UMatUsageFlags.USAGE_DEFAULT})
→ void
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allocates new matrix data unless the matrix already has specified size and type.
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deallocate()
→ void
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deallocates the matrix data
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diag({int d = 0})
→ UMat
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... for the specified diagonal
(d=0 - the main diagonal,
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dispose()
→ void
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dot(UMat m)
→ double
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computes dot-product
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getMat(AccessFlag accessFlags)
→ Mat
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https://docs.opencv.org/4.x/d7/d45/classcv_1_1UMat.html#a3d84c72c06ddd55d35b87c3d222d2674
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handle(AccessFlag flag)
→ Pointer<Void>
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inv({int method = DECOMP_LU})
→ UMat
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matrix inversion by means of matrix expressions
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mul(UMat m, {double alpha = 1})
→ UMat
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per-element matrix multiplication by means of matrix expressions
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noSuchMethod(Invocation invocation)
→ dynamic
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Invoked when a nonexistent method or property is accessed.
inherited
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release()
→ void
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decreases reference counter;
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reshape(int cn, {int? rows, List<int>? newSizes})
→ UMat
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creates alternative matrix header for the same data, with different
number of channels and/or different number of rows. see cvReshape.
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row(int i)
→ UMat
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returns a new matrix header for the specified row
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rowRange(int start, int end)
→ UMat
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.. for the specified row span
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setTo(Scalar value, {UMat? mask})
→ void
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sets some of the matrix elements to s, according to the mask
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step1([int i = 0])
→ int
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returns step/elemSize1()
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t()
→ UMat
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matrix transposition by means of matrix expressions
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toString()
→ String
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A string representation of this object.
override
