#include <stdio.h>
#include <cstdlib>
static const float pyramid_kernel[] = {
    1,  4,  6,  4, 1,
    4, 16, 24, 16, 4,
    6, 24, 36, 24, 6,
    4, 16, 24, 16, 4,
    1,  4,  6,  4, 1
};
array pyramid(
const array& img, 
const int level, 
const bool sampling)
 
{
    array kernel(5, 5, pyramid_kernel);
 
    kernel = kernel / 256.f;
    if(sampling) {                              
        for(int i = 0; i < level; i++) {
            for(
int j = 0; j < pyr.
dims(2); j++)
 
        }
    } else {                                    
        for(int i = 0; i < level; i++) {
            for(
int j = 0; j < pyr.
dims(2); j++)
 
            pyr = tmp;
        }
    }
    return pyr;
}
void pyramids_demo(bool console)
{
    af::Window wnd_rgb(
"Image Pyramids - RGB Images");
 
    af::Window wnd_gray(
"Image Pyramids - Grayscale Images");
 
    wnd_rgb.setPos(25, 25);
    wnd_gray.setPos(150, 150);
    array img_rgb = 
loadImage(ASSETS_DIR 
"/examples/images/atlantis.png", 
true) / 255.f; 
 
    array downc1 = pyramid(img_rgb,  1, 
true);
 
    array downc2 = pyramid(img_rgb,  2, 
true);
 
    array upc1   = pyramid(img_rgb,  1, 
false);
 
    array upc2   = pyramid(img_rgb,  2, 
false);
 
    array downg1 = pyramid(img_gray, 1, 
true);
 
    array downg2 = pyramid(img_gray, 2, 
true);
 
    array upg1   = pyramid(img_gray, 1, 
false);
 
    array upg2   = pyramid(img_gray, 2, 
false);
 
    while (!wnd_rgb.close() && !wnd_gray.close()) {
        wnd_rgb.grid(2, 3);
        wnd_rgb(0, 0).image(img_rgb, "color image");
        wnd_rgb(1, 0).image(downc1, "downsample 1 level");
        wnd_rgb(0, 1).image(downc2, "downsample 2 levels");
        wnd_rgb(1, 1).image(upc1, "upsample 1 level");
        wnd_rgb(0, 2).image(upc2, "upsample 2 level");
        wnd_rgb.show();
        wnd_gray.grid(2, 3);
        wnd_gray(0, 0).image(img_gray, "grayscale image");
        wnd_gray(1, 0).image(downg1, "downsample 1 level");
        wnd_gray(0, 1).image(downg2, "downsample 2 levels");
        wnd_gray(1, 1).image(upg1, "upsample 1 level");
        wnd_gray(0, 2).image(upg2, "upsample 2 level");
        wnd_gray.show();
    }
}
int main(int argc, char** argv)
{
    int device = argc > 1 ? atoi(argv[1]) : 0;
    bool console = argc > 2 ? argv[2][0] == '-' : false;
    try {
        printf("** ArrayFire Image Pyramids Demo **\n\n");
        pyramids_demo(console);
        fprintf(stderr, 
"%s\n", e.
what());
        throw;
    }
    return 0;
}