《Learning OpenCV3》——第五章 大型数据操作

第五章 大型数据操作

上一章介绍了OpenCV3大型数据的存储如cv::Mat<>和cv::SparseMat<>以及它们的一些基本操作。这一章将继续介绍针对Mat类型的一些其他常用操作。

Mat的操作

函数	描述
cv::abs()	Return absolute value of all elements in an array
cv::absdiff()	Return absolute value of differences between two arrays
cv::add()	Perform element-wise addition of two arrays
cv::addWeighted()	Perform element-wise weighted addition of two arrays (alpha blending)
cv::bitwise_and()	Compute element-wise bit-level AND of two arrays
cv::bitwise_not()	Compute element-wise bit-level NOT of two arrays
cv::bitwise_or()	Compute element-wise bit-level OR of two arrays
cv::bitwise_xor()	Compute element-wise bit-level XOR of two arrays
cv::calcCovarMatrix()	Compute covariance of a set of n-dimensional vectors
cv::cartToPolar()	Compute angle and magnitude from a two-dimensional vector field
cv::checkRange()	Check array for invalid values
cv::compare()	Apply selected comparison operator to all elements in two arrays
cv::completeSymm()	Symmetrize matrix by copying elements from one half to the other
cv::convertScaleAbs()	Scale array, take absolute value, then convert to 8-bit unsigned
cv::countNonZero()	Count nonzero elements in an array
cv::arrToMat()	Convert pre–version 2.1 array types to cv::Mat
cv::dct()	Compute discrete cosine transform of array
cv::determinant()	Compute determinant of a square matrix
cv::dft()	Compute discrete Fourier transform of array
cv::divide()	Perform element-wise division of one array by another
cv::eigen()	Compute eigenvalues and eigenvectors of a square matrix
cv::exp()	Perform element-wise exponentiation of array
cv::extractImageCOI()	Extract single channel from pre–version 2.1 array type
cv::flip()	Flip an array about a selected axis
cv::gemm()	Perform generalized matrix multiplication
cv::getConvertElem()	Get a single-pixel type conversion function
cv::getConvertScaleElem()	Get a single-pixel type conversion and scale function
cv::idct()	Compute inverse discrete cosine transform of array
cv::idft()	Compute inverse discrete Fourier transform of array
cv::inRange()	Test if elements of an array are within values of two other arrays
cv::invert()	Invert a square matrix
cv::log()	Compute element-wise natural log of array
cv::magnitude()	Compute magnitudes from a two-dimensional vector field
cv::LUT()	Convert array to indices of a lookup table
cv::Mahalanobis()	Compute Mahalanobis distance between two vectors
cv::max()	Compute element-wise maxima between two arrays
cv::mean()	Compute the average of the array elements
cv::meanStdDev()	Compute the average and standard deviation of the array elements
cv::merge()	Merge several single-channel arrays into one multichannel array
cv::min()	Compute element-wise minima between two arrays
cv::minMaxLoc()	Find minimum and maximum values in an array
cv::mixChannels()	Shuffle channels from input arrays to output arrays
cv::mulSpectrums()	Compute element-wise multiplication of two Fourier spectra
cv::multiply()	Perform element-wise multiplication of two arrays
cv::mulTransposed()	Calculate matrix product of one array
cv::norm()	Compute normalized correlations between two arrays
cv::normalize()	Normalize elements in an array to some value
cv::perspectiveTransform(）	Perform perspective matrix transform of a list of vectors
cv::phase()	Compute orientations from a two-dimensional vector field
cv::polarToCart()	Compute two-dimensional vector field from angles and magnitudes
cv::pow()	Raise every element of an array to a given power
cv::randu()	Fill a given array with uniformly distributed random numbers
cv::randn()	Fill a given array with normally distributed random numbers
cv::randShuffle()	Randomly shuffle array elements
cv::reduce()	Reduce a two-dimensional array to a vector by a given operation
cv::repeat()	Tile the contents of one array into another
cv::saturate_cast<>()	Convert primitive types (template function)
cv::scaleAdd()	Compute element-wise sum of two arrays with optional scaling of the first
cv::setIdentity()	Set all elements of an array to 1 for the diagonal and 0 otherwise
cv::solve()	Solve a system of linear equations
cv::solveCubic()	Find the (only) real roots of a cubic equation
cv::solvePoly()	Find the complex roots of a polynomial equation
cv::sort()	Sort elements in either the rows or columns in an array
cv::sortIdx()	Serve same purpose as cv::sort(), except array is unmodified and indices arereturned
cv::split()	Split a multichannel array into multiple single-channel arrays
cv::sqrt()	Compute element-wise square root of an array
cv::subtract()	Perform element-wise subtraction of one array from another
cv::sum()	Sum all elements of an array
cv::theRNG()	Return a random number generator
cv::trace()	Compute the trace of an array
cv::transform()	Apply matrix transformation on every element of an array
cv::transpose()	Transpose all elements of an array across the diagonal