Learning OpenCV

Matrix and Image Operators

Table 3-3 lists a variety of routines for matrix manipulation, most of which work equally well for images. They do all of the "usual" things, such as diagonalizing or transposing a matrix, as well as some more complicated operations, such as computing image statistics.

Table 3-3. Basic matrix and image operators

Function	Description
cvAbs	Absolute value of all elements in an array
cvAbsDiff	Absolute value of differences between two arrays
cvAbsDiffS	Absolute value of differences between an array and a scalar
cvAdd	Elementwise addition of two arrays
cvAddS	Elementwise addition of an array and a scalar
cvAddWeighted	Elementwise weighted addition of two arrays (alpha blending)
cvAvg	Average value of all elements in an array
cvAvgSdv	Average value and standard deviation of all elements in an array
cvCalcCovarMatrix	Compute covariance of a set of n-dimensional vectors
cvCmp	Apply selected comparison operator to all elements in two arrays
cvCmpS	Apply selected comparison operator to an array relative to a scalar
cvConvertScale	Convert array type with optional rescaling of the value
cvConvertScaleAbs	Convert array type after absolute value with optional rescaling
cvCopy	Copy elements of one array to another
cvCountNonZero	Count nonzero elements in an array
cvCrossProduct	Compute cross product of two three-dimensional vectors
cvCvtColor	Convert channels of an array from one color space to another ...