Specifications

Geometric Transforms
11-5
11
Decimate
Decimates or shrinks an
image.
void iplDecimate(IplImage* srcImage , IplImage* dstImage ,
int
xDst , int xSrc , int yDst , int ySrc , int interpolate );
srcImage Thesourceimage.
dstImage The resultant image.
xDst,xSrc,yDst,ySrc Positive integers specifying the fractions
xDst/xSrc ≤ 1and yDst/ySrc ≤ 1 - the factors
by which the x and y dimensions of the image’s
ROI are changed. For example, setting
xDst =1, xSrc =2, yDst =1, ySrc =2
decreases the image size in each dimension by
half.
interpolate The type of interpolation to perform for
resampling. Can be one of the following:
IPL_INTER_NN Nearest neighbor.
IPL_INTER_LINEAR Linear interpolation.
IPL_INTER_CUBIC Cubic interpolation.
IPL_INTER_SUPER Super-sampling.
Discussion
The function iplDecimate() decimates or shrinks the source image
srcImage by xDst/xSrc in the x direction and yDst/ySrc in the y
direction. The interpolation specified by
interpolate is used for
resampling the input image.