void OFVideoGrabberApp::update(){
unsigned char *buffer = (unsigned char*)malloc(camWidth*camHeight);
ofBackground(80, 80, 80);
videoGrabber.grabFrame();
if(videoGrabber.isFrameNew()){
unsigned char* pixels = videoGrabber.getPixels();
convert_to_greyscale(pixels, camWidth, camHeight, buffer);
edge_detect(buffer, camWidth, camHeight, filterBuffer);
filteredTexture.loadData(filterBuffer, camWidth, camHeight, GL_LUMINANCE);
}
free(buffer);
}
void scan_image(SDL_Surface* image) {
predict_cascade_t* cascade = load_adaboost("adaboost_test2.txt");
features_array_t* features = alloc_features_array();
Uint32 red_pixel = SDL_MapRGB(image->format, 0, 255, 0);
for (int i = 0; i < 162336; ++i) {
feature_t f;
f.i = f.j = f.w = f.h = f.charac = f.value = -1;
add_feature(f, features);
}
const int padding = 2;
for (int scale = 24; scale < 100; scale *= 1.25) {
for (int i = 0; i < image->w - scale; i += padding) {
for (int j = 0; j < image->h - scale; j += padding) {
SDL_Surface* sub_window = extract_image(image, i, j, scale, scale);
convert_to_greyscale(sub_window);
//if (scale != 24) {
sub_window = scale_surface(sub_window, 24, 24);
//}
integral_image_t* integral_image = alloc_integral_image(sub_window->w, sub_window->h);
convert_to_integral_image(sub_window, integral_image);
SDL_FreeSurface(sub_window);
int k = 0;
cascade_t layer;
printf("\n=============================\n\n");
printf("x=%d y=%d\n", i, j);
while (k < cascade->nb_layers) {
compute_cascade_features(features, cascade->layers[k], integral_image);
layer.nb_features = cascade->layers[k]->T;
layer.alphas = cascade->layers[k]->alphas;
layer.thresholds = cascade->layers[k]->thresholds;
layer.parities = cascade->layers[k]->parities;
layer.features = cascade->layers[k]->features;
layer.strong_threshold = cascade->layers[k]->strong_threshold;
if (!strong_classify(features, &layer)) {
printf("non face layer=%d\n", k);
break;
}
++k;
}
free_integral_image(integral_image);
if (k == cascade->nb_layers) {
printf("---------------------------------------------------------detected\n");
for (int x = i; x < i + scale; ++x) {
putpixel(image, x, j, red_pixel);
}
for (int y = j; y < j + scale; ++y) {
putpixel(image, i, y, red_pixel);
}
for (int x = i; x < i + scale; ++x) {
putpixel(image, x, j + scale, red_pixel);
}
for (int y = j; y < j + scale; ++y) {
putpixel(image, i + scale, y, red_pixel);
}
}
}
}
}
SDL_SaveBMP(image, "../SDL/detection.bmp");
free_features_array(features);
free_predict_cascade(cascade);
}
