读取文件夹连续图片

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总结一下关于图片批量处理方法，仅作参考。

批量处理文件夹下所有的图片

以彩色图像灰度化为例.

参考代码

int main(int argc,char** argv){
    WIN32_FIND_DATAA FileData;  
    HANDLE hFind;  
        
    hFind = FindFirstFileA((LPCSTR)"Imgs/*.jpg",&FileData);  
    if (hFind == INVALID_HANDLE_VALUE){  
        printf ("Invalid File Handle. GetLastError reports %d\n", GetLastError ());  
        return 0;  
    } 
    while (FindNextFileA(hFind, &FileData)){  
        cout<<FileData.cFileName<<endl;  
        string name("Imgs/");  
        name.append(FileData.cFileName);  
        IplImage* src=cvLoadImage(name.c_str());  
        if (!src){  
            cout<<"failed to load image"<<endl;  //API
            //AfxMessageBox("failed to load image"); //MFC
            break;  
        }  
        assert(src->nChannels==3); 
        // 处理
        IplImage* srcGray = cvCreateImage(cvGetSize(src),IPL_DEPTH_8U,1);
        cvCvtColor(src,srcGray,CV_BGR2GRAY);
        // 保存
        name.append(".srcGray.jpg");
        cvSaveImage(name.c_str(),srcGray);
        cvReleaseImage(&src);  
        cvReleaseImage(&srcGray);  
    }     
    FindClose(&hFind);      
    return 0;
}

opencv图片实现格式转换，并使用批处理实现批量转换

#include <stdio.h>
int main( int argc, char** argv ){
 IplImage* src;

 // -1:  the loaded image will be loaded as is (with number of channels depends on the file).
 if(argc != 3){
	 printf("CONV: Image format convertion, support JPG,BMP,TIF,PNG,PPM\n");
	 printf("Usage: conv srcImage dstImage\n");
	 return 0;
 }

 if((strstr(argv[1],".jpg")==NULL&&strstr(argv[1],".bmp")==NULL&&strstr(argv[1],".tif")==NULL
     &&strstr(argv[1],".png")==NULL&&strstr(argv[1],".ppm")==NULL&&strstr(argv[1],".JPG")==NULL
     &&strstr(argv[1],".BMP")==NULL&& strstr(argv[1],".TIF")==NULL&&strstr(argv[1],".PNG")==NULL
     &&strstr(argv[1],".PPM")==NULL)||(strstr(argv[2],".jpg")==NULL&&strstr(argv[2],".bmp")==NULL
     &&strstr(argv[2],".tif")==NULL&&strstr(argv[2],".png")==NULL&&strstr(argv[2],".ppm")==NULL)){
		 printf("WARNING: CONV only support JPG,BMP,TIF,PNG,TGA and PPM\n");
 }
 else{
	 if( (src=cvLoadImage(argv[1], -1))!= 0 ) {
		 cvSaveImage( argv[2], src);
		 cvReleaseImage(&src);
		 printf("\n Convert successfully.\n");
	 }
	 else{
		 printf("\n*** Read or write image fails *** \n");
	 }
 }
 return 0;
}

bat_run.bat文件

@echo off
for /r .\src %%I in (*.jpg *.png *.bmp) do ImageCovert.exe %%I .\dst\%%~nI.bmp
pause

遍历读取指定文件夹下指定类型的所有文件

#include "stdafx.h"
#include "windows.h"
#include <vector>
#include <string>

#include "iostream"
using namespace std;
typedef std::vector<std::string> file_lists; 

static int str_compare(const void *arg1, const void *arg2){
	return strcmp((*(std::string*)arg1).c_str(), (*(std::string*)arg2).c_str());
}

file_lists ScanDirectory(const std::string &path, const std::string &extension){
	//WIN32_FIND_DATA:Contains information about the file that is found by the
	//FindFirstFile, FindFirstFileEx, or FindNextFile function
	WIN32_FIND_DATA wfd;WIN32_FIND_DATA wfd;
	HANDLE hHandle;
	
	string searchPath, searchFile;
	file_lists vFilenames;
	int nbFiles = 0;
	
	searchPath = path + "/*" + extension;

	//Searches a directory for a file or subdirectory
    //with a name that matches a specific name	
	hHandle = FindFirstFile(searchPath.c_str(), &wfd);
	
	if (INVALID_HANDLE_VALUE == hHandle){
		fprintf(stderr, "ERROR(%s, %d): Cannot find (*.%s)files in directory %s/n",
			__FILE__, __LINE__, extension.c_str(), path.c_str());
		exit(0);
	}
	
	do{
		//. or ..
		if (wfd.cFileName[0] == '.'){
			continue;
		}
		// if exists sub-directory
		
		if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY){
			//dwFileAttributes:The file attributes of a file
			//FILE_ATTRIBUTE_DIRECTORY:The handle identifies a directory
			continue;
		}
		else{//if file			
			searchFile = path + "/" + wfd.cFileName;
            vFilenames.push_back(searchFile);
            nbFiles++;
         }
	}while (FindNextFile(hHandle, &wfd));
	//Call this member function to continue a file search begun
    //with a call to CGopherFileFind::FindFile
    FindClose(hHandle);
	//Closes a file search handle opened by the FindFirstFile, FindFirstFileEx,
    //or FindFirstStreamW function
	
	// sort the filenames
    qsort((void *)&(vFilenames[0]),(size_t)nbFiles,sizeof(string),str_compare);
	//Performs a quick sort

    return vFilenames;
}

int _tmain(int argc, _TCHAR* argv[]){
     file_lists files = ScanDirectory("..\\TestGroup", ".jpg");
     if (files.empty()){
          cout<<"no image file find in current directory.."<<endl;
          system("pause");
          exit(-1);
      }

      int size = files.size();
      cout<<"there are "<<size<<" image files totally...."<<endl;
      for (int i=0; i<size; i++){
           cout<<files[i].c_str()<<endl;
      }

      system("pause");
      return 0;
}

图片批量归一化处理

#include <cv.h>
#include <highgui.h>
#include <fstream>
#include <string>
#include <vector>

#define LB_TEST
using namespace std;

//read images from the specified directory
void readAllImages(vector<IplImage*>& imgvec)//
CvSeq* readAllImages(){ 
	// Save Filenames to imagelist.txt in the specified directory 
	system("dir/B .\\new > imagelist.txt"); 
	ifstream infile("imagelist.txt");// 
	CvMemStorage* mem = cvCreateMemStorage(0);// 
	CvSeq* imSeq = cvCreateSeq(CV_SEQ_ELTYPE_PTR, sizeof(CvSeq), sizeof(IplImage*), mem); 
	string filename; 
	while (getline(infile, filename)) { 
		filename = "new\\" + filename;
		IplImage* image = cvLoadImage(filename.c_str()); //
		cvSeqPush(imSeq, &image); 
		imgvec.push_back(image); 
	} 
	infile.close();
	// return imSeq;
}
// release images memory
void releaseImages(vector<IplImage*>& imgvec){ 
	for (vector<IplImage*>::iterator it = imgvec.begin(); it != imgvec.end(); ++it) { 
		cvReleaseImage(&(*it)); 
	} 
	imgvec.clear();
}

// 需要改写
void imageNorm(vector<IplImage*>& imgvec,CvRect rect, bool roiFlag = false){ 
	if (roiFlag) { 
		for (vector<IplImage*>::iterator it = imgvec.begin(); it != imgvec.end(); ++it) { 
			// 添加动态获取ROI区域的函数（待补充） 
			cvSetImageROI(*it, rect); 
			// 此处只处理感兴趣区域 
			cvResetImageROI(*it); 
		} 
	} 
	else { 
		for (vector<IplImage*>::iterator it = imgvec.begin(); it != imgvec.end(); ++it) { 
			IplImage* imgTemp = cvCreateImage(cvSize(rect.width, rect.height), IPL_DEPTH_8U, 3); 
			cvResize(*it, imgTemp); 
			cvReleaseImage(&(*it)); 
			*it = imgTemp; 
		} 
	}
}

int main(int argc, char** argv){
	//
	CvSeq* test = NULL; 
	vector<IplImage*> imgvec; 
	cvNamedWindow("test"); 
	readAllImages(imgvec);
#ifdef LB_TEST 
	CvRect rect = cvRect(0, 0, 80, 60); 
	imageNorm(imgvec, rect); 
	for (vector<IplImage*>::iterator it = imgvec.begin(); it != imgvec.end(); ++it) { 
		cvShowImage("test", *it); 
		cvWaitKey(0); 
	}
#endif// 
	test = readAllImages();// 
	cvShowImage("test", (IplImage*)cvGetSeqElem(test, 1)); 
	/*for (int i = 0; i < test->total; i++) { }*/ 
	cvDestroyWindow("test"); 
	releaseImages(imgvec); 
	return 0;
}

读取文件夹连续图片

char filename[100];  
char windowname[100];  
IplImage* pScr;  
unsigned char *Readfigsmethod1(int num)// 读入num个图片  
{  
 for(int i=1;i<=num;i++)  
 {  
  sprintf(filename,"%d.jpg",i);// 将图片以数字命名：例如1.jpg 2.jpg等，放入文件夹下  
  sprintf(windowname,"window%d.jpg",i);  
  pScr=cvLoadImage(filename,1);//导入图片  
  cvNamedWindow(windowname,CV_WINDOW_AUTOSIZE);  
  cvShowImage(windowname,pScr);//显示图片  
  //cvWaitKey(0);  
 }  
 cvWaitKey(0);  
 cvReleaseImage(&pScr);//释放图片  
 cvDestroyAllWindows();//销毁窗口  
   
 return 0;  
}

注释：连续读取图片主要问题在于filename指向图片目录， sprintf(filename,"%d.jpg",i)的使用可以使得filename可以从1.jpg,2.jpg,一直到num.jpg. filename=i.jpg.

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