Struct opencv::core::MatExpr [−][src]
pub struct MatExpr { /* fields omitted */ }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_
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);Implementations
Trait Implementations
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the + operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the / operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
C++ default parameters Read more
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the * operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.
type Output = MatExprResult<MatExpr>
type Output = MatExprResult<MatExpr>
The resulting type after applying the - operator.