Include Files

Flavors with the

_L

suffix:

ippi_l.h

Domain Dependencies

Headers:

ippcore.h

,

ippvm.h

,

ipps.h

Libraries:

ippcore.lib

,

ippvm.lib

,

ipps.lib

Description

This function operates with ROI (see ROI Processing in Geometric Transforms).

This function is used as a support function for the

ippiWarpAffineLinear

, WarpAffineNearest, and WarpAffineCubic functions. It computes the coefficients

coeffs

of the affine transform that must be used by the warping function to map the source rectangular ROI to the quadrangle with the specified vertex coordinates

quad

. The first dimension [4] of the array

quad

[4][2] is equal to the number of vertices, and the second dimension [2] means

x

and

y

coordinates of the vertex. Quadrangle vertices have the following meaning:

quad

[0] corresponds to the transformed top-left corner of the source ROI,

quad

[1] corresponds to the transformed top-right corner of the source ROI,

quad

[2] corresponds to the transformed bottom-right corner of the source ROI,

quad

[3] corresponds to the transformed bottom-left corner of the source ROI.

The function computes the coordinates of the 4th vertex of the destination quadrangle that uniquely depends on the three other vertices. If the computed coordinates are not equal to the ones specified in

quad

, the function returns the warning message and continues operation with the computed values.