作者：gnuhpc
出处：http://www.cnblogs.com/gnuhpc/
#include "cxcore.h"
#include <stdio.h>
#define FLAG 0
#define ERRMODE 0
void cvResizeDCT(CvMat *input_array,CvMat * output_array)
{
CvMat * temp_array=0;
CV_FUNCNAME("cvResizeDCT");
/*#define CV_FUNCNAME( Name ) static char cvFuncName[] = Name*/
//定义了这个函数的名字，其实就是一个字符数组
__BEGIN__;
if (!CV_IS_MAT(input_array) || !CV_IS_MAT(output_array))
{
CV_ERROR(CV_StsBadArg,"Invaild matrices!");
}
CV_ASSERT(input_array ->rows ==1 && output_array ->rows ==1);
CV_CALL(temp_array = cvCreateMat(input_array ->rows,MAX(input_array->cols,
output_array->cols),input_array->type));
if (output_array->cols > input_array->cols)
{
CV_CALL(cvZero(temp_array));
}
temp_array->cols = input_array->cols;
CV_CALL( cvDCT( input_array, temp_array, CV_DXT_FORWARD ));//离散馀弦变换
temp_array->cols = output_array->cols;
CV_CALL( cvDCT( temp_array, output_array, CV_DXT_INVERSE ));
CV_CALL( cvScale( output_array, output_array, 1./sqrt((double)input_array->cols*output_array->cols), 0 ));
__END__;
}
int main(void)
{
CvMat *src = /blog.armyourlife.info/cvCreateMat(1,512,CV_32F);
#if FLAG
CvMat *dst = cvCreateMat(1,256,CV_32F);
#else
CvMat *dst=0;
#endif
cvSet(src,cvRealScalar(1.),0);
#if ERRMODE
cvSetErrMode(CV_ErrModeSilent);
#endif
cvResizeDCT(src,dst);
if (cvGetErrStatus()<0)
{
printf("Some Error Occured!");
}
else
{
printf("Everything is OK!/n");
}
return 0;
}