pub struct MatExpr { /* private fields */ }
Expand description
Matrix expression representation
@anchor MatrixExpressions
This is a list of implemented matrix operations that can be combined in arbitrary complex
expressions (here A, B stand for matrices ( Mat ), s for a scalar ( Scalar ), alpha for a
real-valued scalar ( double )):
- Addition, subtraction, negation:
A+B, A-B, A+s, A-s, s+A, s-A, -A
- Scaling:
A*alpha
- Per-element multiplication and division:
A.mul(B), A/B, alpha/A
- Matrix multiplication:
A*B
- Transposition:
A.t() (means AT)
- Matrix inversion and pseudo-inversion, solving linear systems and least-squares problems:
A.inv([method]) (~ A<sup>-1</sup>), A.inv([method])*B (~ X: AX=B)
- Comparison:
A cmpop B, A cmpop alpha, alpha cmpop A, where cmpop is one of
>, >=, ==, !=, <=, <. The result of comparison is an 8-bit single channel mask whose
elements are set to 255 (if the particular element or pair of elements satisfy the condition) or
- Bitwise logical operations:
A logicop B, A logicop s, s logicop A, ~A, where logicop is one of
&, |, ^.
- Element-wise minimum and maximum:
min(A, B), min(A, alpha), max(A, B), max(A, alpha)
- Element-wise absolute value:
abs(A)
- Cross-product, dot-product:
A.cross(B), A.dot(B)
- Any function of matrix or matrices and scalars that returns a matrix or a scalar, such as norm,
mean, sum, countNonZero, trace, determinant, repeat, and others.
- Matrix initializers ( Mat::eye(), Mat::zeros(), Mat::ones() ), matrix comma-separated
initializers, matrix constructors and operators that extract sub-matrices (see Mat description).
- Mat_<destination_type>() constructors to cast the result to the proper type.
Note: Comma-separated initializers and probably some other operations may require additional
explicit Mat() or Mat_() constructor calls to resolve a possible ambiguity.
Here are examples of matrix expressions:
// compute pseudo-inverse of A, equivalent to A.inv(DECOMP_SVD)
SVD svd(A);
Mat pinvA = svd.vt.t()*Mat::diag(1./svd.w)*svd.u.t();
// compute the new vector of parameters in the Levenberg-Marquardt algorithm
x -= (A.t()*A + lambda*Mat::eye(A.cols,A.cols,A.type())).inv(DECOMP_CHOLESKY)*(A.t()*err);
// sharpen image using "unsharp mask" algorithm
Mat blurred; double sigma = 1, threshold = 5, amount = 1;
GaussianBlur(img, blurred, Size(), sigma, sigma);
Mat lowContrastMask = abs(img - blurred) < threshold;
Mat sharpened = img*(1+amount) + blurred*(-amount);
img.copyTo(sharpened, lowContrastMask);
- _a: Mat()
- _b: Mat()
- _c: Mat()
- _alpha: 1
- _beta: 1
- _s: Scalar()
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
The resulting type after applying the + operator.
Return an the underlying raw pointer while consuming this wrapper.
Read more
Return the underlying mutable raw pointer
Read more
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
The resulting type after applying the / operator.
Executes the destructor for this type.
Read more
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the * operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
The resulting type after applying the - operator.
Immutably borrows from an owned value.
Read more
Mutably borrows from an owned value.
Read more
Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.