Reading images sequentially without using videocapture function or displaying image successively using for loop

Reading images using successive frames in OpenCv without using VideoCapture function:

OR

Reading images using a for loop in OpenCV

We want to read images in a folder by using for loop.

Thus we need to number the images sequentially

Here i have renamed the images as image001.png , image002.png etc.

Note:

You just need to rename the image sequentially and provide a proper path to it.

It can be any type of image .bmp , .jpg, .png etc.

For e.g Arjun001.jpg , Arjun002.jpg ,Arjun003.jpg etc

But the name which you are using before the sequence should be given in the path while coding.

Here is the code below:

 Here the path to my image file is C:\Users\arjun\Desktop.

While the name of my image starts from "image" i.e. image001.png

If it was Arjun001.png then the path should have been:

C:\\Users\\arjun\\Desktop\\Arjun

%03i denotes the no of zeros in the name and total size of the string for e.g 001 , 002 , 003, 004 etc

So change your name accordingly if you make changes in the code.

Here %03i denotes there are there digits in the number with the last digit being ‘i’ and preceding it are all zeroes.

Explanation of the code:

//defines the variable 'filename' taking character input of max 100.

char filename[100]

sprintf(filename, "C:\\Users\\arjun\\Desktop\\image,number");

//The sprintf() function prototype is

int sprintf(char *str, const char *format, arg_1, arg_2, arg_3, ... , arg_n);

Composes a string with the same text that would be printed if format was used on printf, but instead of being printed, the content is stored as a C string in the buffer pointed by str.

//The image is loaded by a function cvLoadImage in a variable called 'image'

image = cvLoadImage(filename);

//No. of image =6

 int nImages = 6;

//For loop for concating the path of the image

for (int i = 1; i < nImages; ++i);

 {

  loadImage(im, i);

  char filename[100];

  strcpy(filename, "C:\\Users\\arjun\\Desktop\\image");

   char frameNo[10];

   sprintf(frameNo, "%03i", i);

  strcat(filename, frameNo);

  strcat(filename, ".png");

//Load the image
  IplImage *im = cvLoadImage(filename,CV_LOAD_IMAGE_COLOR);

  cvNamedWindow("pic");        //Name of the image window 

  cvShowImage("pic",im);         //Display the image window

  cvWaitKey(1000);                  //Wait for 1 sec

  }

 Here is the link of the code:

https://drive.google.com/file/d/0B9Mnn6QWcwVnUjQ4TF93eVZLV00/view?usp=sharing

Here is the code:

/* Read images using successive frames in OpenCv without using VideoCapture function*/
#include "stdlib.h"
#include "math.h"
#include "opencv/cv.h"       // include it to used Main OpenCV functions.
#include "opencv/highgui.h"  //include it to use GUI functions.

 using namespace std;
 using namespace cv;

void loadImage(IplImage *image, int number)
  {
    // Store path to directory
    char filename[100];
    sprintf(filename, "C:\\Users\\arjun\\Desktop\\image,number");
    image = cvLoadImage(filename);
  }

  int main(int argc, char* argv[])
  {
   IplImage *im=0;
   int nImages = 6;
   for (int i = 1; i < nImages; ++i)
     {
       loadImage(im, i);
       char filename[100];
       strcpy(filename, "C:\\Users\\arjun\\Desktop\\image");
       char frameNo[10];
       sprintf(frameNo, "%03i", i);
    strcat(filename, frameNo);
       strcat(filename, ".png");
       IplImage *im = cvLoadImage(filename,CV_LOAD_IMAGE_COLOR);
       cvNamedWindow("pic");
       cvShowImage("pic",im);
       cvWaitKey(1000);
     }
  }