Specifications

Intel
®
Image Processing Library Reference Manual
9-20
9
SetColorTwist
Sets a color-twist matrix
data structure.
void iplSetColorTwist(IplColorTwist* cTwist , int data [16],
int
scalingValue );
data An array containing the sixteen values that
constitute the color-twist matrix. The values
are in row-wise order. Color-twist values
that are in the range -1 to 1 should be
scaled up to be in the range -2
31
to 2
31
.
(Simply multiply the floating point number
in the -1 to 1 range by 2
31
.)
scalingValue The scaling value: an exponent of a power of 2
that was used to convert to integer values; for
example, if 2
31
was used to multiply the values,
the
scalingValue is 31. This value is used for
normalization.
Discussion
The function iplSetColorTwist() is used to set the vaules of the color-
twist matrix in the data structure
IplColorTwist that can subsequently be
used by the function
iplApplyColorTwist().
Return Value
A pointer to the IplColorTwist data structure containing the color-twist
matrix in the form suitable for efficient computation by the function
iplApplyColorTwist().