Practica1Ej3Revisado.c

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

#include <opencv/cv.h>
#include <opencv/highgui.h>

int main(int argc, char **argv) {

    if (argc != 2) {
        printf("Error: Usage %s image_file_name\n", argv[0]);
        return EXIT_FAILURE;
    }

    //CV_LOAD_IMAGE_COLOR = 1 forces the resultant IplImage to be colour.
    //CV_LOAD_IMAGE_GRAYSCALE = 0 forces a greyscale IplImage.
    //CV_LOAD_IMAGE_UNCHANGED = -1
    IplImage* Img = cvLoadImage(argv[1], CV_LOAD_IMAGE_COLOR);

    // Always check if the program can find the image file
    if (!Img) {
        printf("Error: file %s not found\n", argv[1]);
        return EXIT_FAILURE;
    }

    // a visualization window is created with title: image file name
    cvNamedWindow(argv[1], CV_WINDOW_AUTOSIZE);
    // Img is shown in 'image' window
    cvShowImage(argv[1], Img);

    // Crea la imagen para la componete azul
    IplImage* ImgMitad = cvCreateImage(cvSize(Img->width, Img->height), IPL_DEPTH_8U, 3);

    int fila, columna;
    int mitad = Img->height / 2;
    // nos movemos por filas
    for (fila = 0; fila < Img->height/2; fila++) {
        // abajo de original - arriba de imagen creada
        unsigned char *pLeer1 = (unsigned char *) Img->imageData + (fila+ mitad)* Img->widthStep;
        unsigned char *pEscribir1 = (unsigned char *) ImgMitad->imageData + fila * ImgMitad->widthStep;
        
        
        unsigned char *pLeer2 = (unsigned char *) Img->imageData + fila * Img->widthStep;
        unsigned char *pEscribir2 = (unsigned char *) ImgMitad->imageData + (fila + mitad) * ImgMitad->widthStep;


        for (columna = 0; columna < Img->width; columna++) {
            *pEscribir2++ = *pLeer2++;
            *pEscribir2++ = *pLeer2++;
            *pEscribir2++ = *pLeer2++;
            *pEscribir1++ = *pLeer1++;
            *pEscribir1++ = *pLeer1++;
            *pEscribir1++ = *pLeer1++;

        }
    }

    // crea y muestras las ventanas con las im genes
    cvNamedWindow("Imagen Mitades", CV_WINDOW_AUTOSIZE);
    cvShowImage("Imagen Mitades", ImgMitad);

    cvWaitKey(0);


    // memory release for images before exiting the application
    cvReleaseImage(&Img);
    cvReleaseImage(&ImgMitad);

    // Self-explanatory
    cvDestroyWindow(argv[1]);
    cvDestroyWindow("Imagen Mitades");

    return EXIT_SUCCESS;
}