20130512_Lab_HW01

#include <stdio.h>
#include <stdlib.h>

#include "cv.h"
#include "highgui.h"


int main(int argc, char* argv[])
{
    int w, h, nc;  int step;
    int x, y, i;
    IplImage* img; IplImage* img2;
    int Y, R, G, B;
    int *ary[9]={0};

    //if( argc == 2 && (img = cvLoadImage(argv[1], -1)) != 0 )
    if( (img = cvLoadImage("step_up_rev.jpg", CV_LOAD_IMAGE_GRAYSCALE )) != 0 ) //
    {
        printf("Channels %d depth %d widthStep %d \n",
                         img->nChannels, img->depth, img->widthStep);
        printf("The image Width by Height is %d * %d \n", img->width,img->height);
        printf("The image origin is  %d\n", img->origin);

        step =  img->widthStep;
    w = img->width;
        h = img->height;
        nc = img->nChannels;

        img2 = cvCreateImage(
                       cvSize(w, h), //CvSize size,
                       IPL_DEPTH_8U , //int depth,
                       nc  //int channels
        );

    cvNamedWindow( "Image 2", 1 );
        cvShowImage( "Image 2", img2 );
        cvNamedWindow( "Image 1", 1 );
        cvShowImage( "Image 1", img );
        cvWaitKey(0);


        uchar* ptr;
        uchar* ptr2;

        int temp;

        for (y = 1; y < h-1; y++)  // using macro
        {
           for (x = 1; x < w-1; x++)
           {
              ptr = &CV_IMAGE_ELEM(img, uchar, y, x * img->nChannels);
              ptr2 = &CV_IMAGE_ELEM(img2, uchar, y, x * img2->nChannels);
              //CV_IMAGE_ELEM( image, elemtype, row, col )

              temp =
               0*ptr[-2-2*step] +  ptr[-1-2*step]  + 2*ptr[-2*step] + ptr[1-2*step]  + 0*ptr[2-2*step] +
         ptr[-2-step]    + 3*ptr[-1-step]   + 5*ptr[0-step]  + 3*ptr[1-step]  +   ptr[2-step]   +
           2*ptr[-2]        + 5*ptr[-1]        + 9*ptr[0]       + 5*ptr[1]       +  2*ptr[2]       +
                 ptr[step-2]     + 3*ptr[step-1]    + 5*ptr[step+0]  + 3*ptr[step+1]  +   ptr[step+2]   +
               0*ptr[2*step-2]  +  ptr[-1+2*step]  + 2*ptr[2*step]  + ptr[1+2*step]  + 0*ptr[2+2*step]  ;
        //  5*5 Filter

              ptr2[0] = temp/25;

           }
        }
        cvShowImage( "Image 2", img2 );

        cvWaitKey(0);
        cvDestroyWindow( "Image 2" );
        cvDestroyWindow( "Image 1" );
        cvReleaseImage( &img );
        cvReleaseImage( &img2 );
        return 0;
       }


    printf("Can't opne image file\n");system("PAUSE"); return -1;
}