最近需要一個專案是對影象識別，學習了一下opencv。對opencv了一個簡單理解：
程式碼只能讀取已知影象大小的畫素RGB值，例如375*500，其他大小可將CvPoint pt2 = cvPoint(375,a)和for(a=0;a<=500;a++)數字替換。

#include "stdafx.h"
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
void help() {
printf("\nRead out RGB pixel values and store them to disk\nCall:\n"
 

"\n This will store to files blines.csv, glines.csv and rlines.csv\n\n");
}
int main( int argc, char** argv  )
{
    IplImage *img = cvLoadImage( argv[1] );
    cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
    cvShowImage( "Example1", img );
    cvWaitKey(0);
    if(!img){printf("\nCouldn't open %s\n"
 
,argv[1]); help(); return -1;}
    int a;
    int max_buffer;
    int r[10000],g[10000],b[10000];
    FILE *fptrb = fopen("blines.csv","w"); //Store the data here
    FILE *fptrg = fopen("glines.csv","w"); // for each color channel
    FILE *fptrr = fopen("rlines.csv","w");
    CvLineIterator iterator;
    for(a=0;a<=500
 
;a++)
    {
        CvPoint pt1 = cvPoint(1,a);
        CvPoint pt2 = cvPoint(375,a);
        max_buffer = cvInitLineIterator(img,pt1,pt2,&iterator,8,0);
        for(int j=0; j<max_buffer; j++)
        {
            fprintf(fptrb,"%d,", iterator.ptr[0]); //Write blue value
            fprintf(fptrg,"%d,", iterator.ptr[1]); //green
            fprintf(fptrr,"%d,", iterator.ptr[2]); //red
            iterator.ptr[2] = 0;  //Mark this sample in red
            CV_NEXT_LINE_POINT(iterator); //Step to the next pixel
        }
        //OUTPUT THE DATA IN ROWS:
        fprintf(fptrb,"\n");fprintf(fptrg,"\n");fprintf(fptrr,"\n");
    }
    printf("\nData stored to files: blines.csv, glines.csv and rlines.csv\n\n");
    fclose(fptrb); fclose(fptrg); fclose(fptrr);
    cvShowImage( "Example2", img );
    cvWaitKey(0);
}

還望大佬們能給我指正更多的好辦法