Mat class

Inheritance
Available extensions

Constructors

Mat.create({int rows = 0, int cols = 0, int r = 0, int g = 0, int b = 0, MatType? type})
factory
Mat.empty()
factory
Mat.eye(int rows, int cols, MatType type)
Returns an identity matrix of the specified size and type.
factory
Mat.from2DList(Iterable<Iterable<num>> data, MatType type)
Create a Mat from a 2D list
factory
Mat.from3DList(Iterable<Iterable<Iterable<num>>> data, MatType type)
Create a Mat from a 3D list
factory
Mat.fromList(int rows, int cols, MatType type, List<num> data)
Create a Mat from a list of data
factory
Mat.fromNative(Mat mat)
factory
Mat.fromPointer(MatPtr mat, [bool attach = true])
This method is different from Mat.fromPtr, will construct from pointer directly
factory
Mat.fromPtr(Mat m, int rows, int cols, int type, int prows, int pcols)
this constructor is a wrapper of Mat (int rows, int cols, int type, void *data, size_t step=AUTO_STEP)
factory
Mat.fromRange(Mat mat, int rowStart, int rowEnd, {int colStart = 0, int? colEnd})
Create Mat from another Mat with range
factory
Mat.fromScalar(int rows, int cols, MatType type, Scalar s)
rows Number of rows in a 2D array.
factory
Mat.fromVec(Vec<Struct, dynamic> vec, {int? rows, int? cols, MatType? type})
factory
Mat.ones(int rows, int cols, MatType type)
Returns an array of all 1's of the specified size and type.
factory
Mat.randn(int rows, int cols, MatType type, {Scalar? mean, Scalar? std})
factory
Mat.randu(int rows, int cols, MatType type, {Scalar? low, Scalar? high})
factory
Mat.zeros(int rows, int cols, MatType type)
Returns a zero array of the specified size and type.
factory

Properties

channels → int
no setter
cols → int
no setter
countNoneZero → int
only for channels == 1
no setter
data → Uint8List
Get a view of native data, and will be GCed when the Mat is GCed.
no setter
dataPtr → Pointer<U8>
Get the data pointer of the Mat
no setter
dims → int
no setter
elemSize → int
no setter
elemSize1 → int
no setter
flags → int
no setter
hashCode → int
The hash code for this object.
no setterinherited
height → int
no setter
isContinus → bool
no setter
isEmpty → bool
no setter
isSubmatrix → bool
no setter
props → List<Object?>
no setterinherited
ptr ↔ Pointer<Mat>
getter/setter pairinherited
ref → Mat
no setteroverride
rows → int
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
shape → List<int>
(rows, cols, channels)
no setter
size → VecI32
Mat.size
no setter
step → (int, int, int)
no setter
total → int
no setter
type → MatType
no setter
width → int
no setter

Methods

add<T>(T val, {bool inplace = false}) → Mat
add
addF32(double val, {bool inplace = false}) → Mat
addF64(double val, {bool inplace = false}) → Mat
addI16(int val, {bool inplace = false}) → Mat
addI32(int val, {bool inplace = false}) → Mat
addI8(int val, {bool inplace = false}) → Mat
addMat(Mat other, {bool inplace = false}) → Mat
addU16(int val, {bool inplace = false}) → Mat
addU8(int val, {bool inplace = false}) → Mat
adjustROI(int dtop, int dbottom, int dleft, int dright) → Mat
Adjusts a submatrix size and position within the parent matrix.
at<T>(int i0, int i1, [int? i2]) → T
cv::Mat::at<T>(i0, i1, i2) of cv::Mat
atNum(int i0, int i1, [int? i2]) → num
wrapper of cv::Mat::at()
atPixel(int row, int col) → List<num>
Get pixel value via row, col, returns a view of native data
atVec<T>(int row, int col) → T
clone() → Mat
col(int x) → Mat
Creates a matrix header for the specified matrix column.
colRange(int start, int end) → Mat
Creates a matrix header for the specified column span.
convertTo(MatType type, {double alpha = 1, double beta = 0}) → Mat
Converts an array to another data type with optional scaling.
convertToFp16() → Mat
copyTo(Mat dst, {Mat? mask}) → void
Copies the matrix to another one.
copyToWithMask(Mat dst, Mat mask) → void
dispose() → void
divide<T>(T val, {bool inplace = false}) → Mat
divide
divideF32(double val, {bool inplace = false}) → Mat
divideF64(double val, {bool inplace = false}) → Mat
divideI16(int val, {bool inplace = false}) → Mat
divideI32(int val, {bool inplace = false}) → Mat
divideI8(int val, {bool inplace = false}) → Mat
divideMat(Mat other, {bool inplace = false}) → Mat
divideU16(int val, {bool inplace = false}) → Mat
divideU8(int val, {bool inplace = false}) → Mat
forEachPixel(void callback(int row, int col, List<num> pixel)) → void
Iterate over all pixels in the Mat.
forEachRow(void callback(int row, List<num> values)) → void
Iterate over all rows in the Mat.
isSubtype<S, T>() → bool
locateROI() → (Size, Point)
Locates the matrix header within a parent matrix.
mean({Mat? mask}) → Scalar
mul(Mat other, {bool inplace = false, double scale = 1.0}) → Mat
Performs an element-wise multiplication or division of the two matrices.
multiply<T>(T val, {bool inplace = false}) → Mat
Multiply
multiplyF32(double val, {bool inplace = false}) → Mat
multiplyF64(double val, {bool inplace = false}) → Mat
multiplyI16(int val, {bool inplace = false}) → Mat
multiplyI32(int val, {bool inplace = false}) → Mat
multiplyI8(int val, {bool inplace = false}) → Mat
multiplyMat(Mat other, {bool inplace = false}) → Mat
Matrix multiplication
multiplyU16(int val, {bool inplace = false}) → Mat
multiplyU8(int val, {bool inplace = false}) → Mat
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
patchNaNs({double val = 0}) → void
PatchNaNs converts NaN's to zeros.
ptrAt<T extends NativeType>(int i0, [int? i1, int? i2]) → Pointer<T>
equivalent to Mat::ptr<T>(i0, i1, i2)
ptrAtF16(int i0, [int? i1, int? i2]) → Float16P
region(Rect rect) → Mat
https://docs.opencv.org/4.x/d3/d63/classcv_1_1Mat.html#aa7ec97373406215f2d4bc72cc1d27036
release() → void
reshape(int cn, [int rows = 0]) → Mat
Changes the shape and/or the number of channels of a 2D matrix without copying the data.
reshapeTo(int cn, List<int> newshape) → Mat
https://docs.opencv.org/4.x/d3/d63/classcv_1_1Mat.html#ab2e41a510891e548f744832cf9b8ab89
rotate(int rotationCode, {bool inplace = false}) → Mat
row(int y) → Mat
Creates a matrix header for the specified matrix row.
rowRange(int start, int end) → Mat
Creates a matrix header for the specified row span.
set<T>(int i0, int i1, T val, [int? i2]) → void
equivalent to Mat::at<T>(i0, i1, i2) = val; where T might be int, double, or cv::Vec<> like cv::Vec3b
setNum(int i0, int i1, num val, [int? i2]) → void
setTo(Scalar value, {Mat? mask}) → Mat
Sets all or some of the array elements to the specified value.
setVec<T extends CvVec<Struct>>(int row, int col, T val) → void
sqrt() → Mat
Calculates a square root of array elements.
stdDev() → Scalar
Calculates standard deviation, per channel.
subtract<T>(T val, {bool inplace = false}) → Mat
subtract
subtractF32(double val, {bool inplace = false}) → Mat
subtractF64(double val, {bool inplace = false}) → Mat
subtractI16(int val, {bool inplace = false}) → Mat
subtractI32(int val, {bool inplace = false}) → Mat
subtractI8(int val, {bool inplace = false}) → Mat
subtractMat(Mat other, {bool inplace = false}) → Mat
subtractU16(int val, {bool inplace = false}) → Mat
subtractU8(int val, {bool inplace = false}) → Mat
sum() → Scalar
Sum calculates the per-channel pixel sum of an image.
t() → Mat
Transposes a matrix.
toFmtString({int fmtType = FMT_NUMPY, int f16Precision = 4, int f32Precision = 8, int f64Precision = 16, bool multiLine = true}) → String
toList() → List<List<num>>
This Method converts single-channel Mat to 2D List
toList3D() → List<List<List<num>>>
Returns a 3D list of the mat, only for multi-channel mats. The list is ordered as colchannels.
toString() → String
A string representation of this object.
override
transpose({bool inplace = false}) → Mat
variance() → Scalar
Similar to stdDev

Operators

operator ==(Object other) → bool
The equality operator.
inherited

Static Properties

finalizer → NativeFinalizer
final

Constants

FMT_C → const int
FMT_CSV → const int
FMT_DEFAULT → const int
FMT_MATLAB → const int
FMT_NUMPY → const int
FMT_PYTHON → const int