开发环境：winXP + vc2010 + OpenCV1.0

OpenCV1.0安装目录： D:\opensource\opencv1.0

源代码：

/*功能：将指定目录下的所有JPG文件进行缩放后存放到目标文件夹开发环境: winXP + vc2010 + openCV1.0头文件路径:D:\opensource\opencv1.0\cv\includeD:\opensource\opencv1.0\cxcore\includeD:\opensource\opencv1.0\otherlibs\highguilib文件目录:D:\opensource\opencv1.0\lib用到的lib文件: cxcore.lib cv.lib highgui.lib*/
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <io.h>
#include <direct.h>
#include <vector>
#include <cv.h>
#include <highgui.h>using namespace std;void checkDir(const char *dir)
{if(_access(dir, 0) == -1){_mkdir(dir);}
}// 获取指定目录下所有jpg文件列表
bool getImageFileList(const char *srcDir, vector<string> &fileList)
{_finddata_t fileDir;long lfDir;char f[100] = {0};sprintf(f, "%s\\*.JPG", srcDir);if((lfDir = _findfirst(f, &fileDir)) != -1L){do{fileList.push_back(fileDir.name);}while(_findnext(lfDir, &fileDir) == 0 );_findclose(lfDir);return true;}return false;
}/*功能：将源图像文件另存为目标文件，按scale比例缩放
*/
bool stretchImage(const char *srcImg, const char *destImg, double scale)
{IplImage *src = NULL, *dst = NULL;CvSize dst_cvsize;			//目标图像尺寸src = cvLoadImage(srcImg, CV_LOAD_IMAGE_UNCHANGED);if(!src){printf("Load source image[%s] failed, please check!\n", srcImg);return false;}dst_cvsize.width = (int)(src->width * scale);dst_cvsize.height = (int)(src->height * scale);	dst = cvCreateImage( dst_cvsize, src->depth, src->nChannels);	//构造目标图象
//	cvResize(src, dst, CV_INTER_LINEAR);	//缩放源图像到目标图像cvResize(src, dst, CV_INTER_CUBIC);		//缩放源图像到目标图像cvSaveImage(destImg, dst);cvReleaseImage(&src);cvReleaseImage(&dst);return true;
}/*功能：将源图像文件另存为目标文件，目标图像文件大小为destSize
*/
bool stretchImage(const char *srcImg, const char *destImg, const CvSize destSize)
{IplImage *src = NULL, *dst = NULL;src = cvLoadImage(srcImg, CV_LOAD_IMAGE_UNCHANGED);if(!src){printf("Load source image[%s] failed, please check!\n", srcImg);return false;}dst = cvCreateImage( destSize, src->depth, src->nChannels);	//构造目标图象
//	cvResize(src, dst, CV_INTER_LINEAR);		//缩放源图像到目标图像cvResize(src, dst, CV_INTER_CUBIC);			//缩放源图像到目标图像cvSaveImage(destImg, dst);cvReleaseImage(&src);cvReleaseImage(&dst);return true;
}// 将指定目录下的*.JPG文件压缩后，存放到目标文件夹
bool stretchImages(const char *srcDir, const char *destDir)
{vector<string> fileList;getImageFileList(srcDir, fileList);if(fileList.size() > 0){const double scale = 0.25;char srcFile[255], destFile[255];checkDir(destDir);for(vector<string>::iterator it = fileList.begin(); it != fileList.end(); it++){sprintf(srcFile, "%s\\%s", srcDir, it->c_str());sprintf(destFile, "%s\\%s", destDir, it->c_str());printf("Stretch Image [%s] -> [%s]\n", srcFile, destFile);stretchImage(srcFile, destFile, scale);}return true;}else{puts("There is no image can be stretched.");return false;}
}int main(int argc, char* argv[])
{if(argc < 3){printf("Usage: %s <srcDir> <destDir>\n", argv[0]);return -1;}const char *srcDir = argv[1];const char *destDir = argv[2];printf("srcDir=[%s], destDir=[%s]\n", srcDir, destDir);stretchImages(srcDir, destDir);return 0;
}/*注：以上的代码除了用到一个c++的vector<string>，其他的都是C的东西，所以要改成纯C的也应该不难！
*/

运行结果：

D:\program\vc2010\cv1>cv1 .
Usage: cv1 <srcDir> <destDir>D:\program\vc2010\cv1>cv1 D:\profile\Desktop\sp D:\profile\Desktop\sp\out
srcDir=[D:\profile\Desktop\sp], destDir=[D:\profile\Desktop\sp\out]
Stretch Image [D:\profile\Desktop\sp\IMG_0335.JPG] -> [D:\profile\Desktop\sp\out\IMG_0335.JPG]
Stretch Image [D:\profile\Desktop\sp\IMG_0336.JPG] -> [D:\profile\Desktop\sp\out\IMG_0336.JPG]
Stretch Image [D:\profile\Desktop\sp\IMG_0337.JPG] -> [D:\profile\Desktop\sp\out\IMG_0337.JPG]