string ns_barcode_decode(const ns_image_standard & image, const string & debug_image_filename){
unsigned char c = image.properties().components;
ns_image_properties p(image.properties());
/*ns_histogram<unsigned long,ns_8_bit> hist;
for (unsigned int y = 0; y < p.height; y++){
for (unsigned int x = 0; x < p.width; x+=c){
hist[ image[y][x] ]++;
}
}
unsigned int max,min;
for (min = 0; min < hist.size(); min++)
if (hist[min] != 0)break;
for (max = hist.size(); max > 1; max--)
if (hist[max] != 0)break;*/
unsigned char thresh = 125;
//build the vertical intensity profile of the image
//we're looking for the top and bottom of the barcode strip.
vector<unsigned int> profile(p.height,0);
for (unsigned int y = 0; y < p.height; y++)
for (unsigned int x = 0; x < c*p.width; x+=c)
profile[y]+=image[y][x] >= thresh;
vector<unsigned int> profile_smoothed(p.height,0);
ns_smooth_series<unsigned int, 48>(profile,profile_smoothed,0);
int bottom(0),
top((int)profile_smoothed.size()-1);
for (int i = (int)profile_smoothed.size()/2; i >=0; i--){
if (profile[i] >= profile[bottom])
bottom = i;
}
for (int i = (int)profile_smoothed.size()/2; i < (int)profile_smoothed.size(); i++){
if (profile[i] >= profile[top])
top = i;
}
unsigned int b_old(bottom),
t_old(top);
if (b_old >= t_old)
throw ns_ex("ns_barcode_decode::Could not register barcode (vertical)");
bottom = b_old;//bottom + (t_old-b_old)/4;
top = t_old;//top - (t_old-b_old)/4;
unsigned int b_marge = bottom + (t_old-b_old)/4,
t_marge = top - (t_old-b_old)/4;
//calculate median intensity of bright area
ns_histogram<unsigned long,ns_8_bit> hist;
for (int y= bottom; y < top; y++)
for (unsigned int x = 0; x < p.width; x++)
hist[image[y][c*x]]++;
hist.set_number_of_pixels((top-bottom)*p.width);
ns_8_bit bright = (ns_8_bit)((3*(unsigned int)hist.median_from_histogram())/5);
//calculate 10th percentile
unsigned int tenth(0);
unsigned int tenth_count(0);
for (tenth = 0; tenth< hist.size(); tenth++){
tenth_count+= hist[tenth] > 50;
if (tenth_count > 10)
break;
}
//bright = tenth;
//find start of bright region at left
unsigned int l_old(0),r_old(p.width);
//find l_old edge
for (unsigned int x = 0; x < p.width/2; x++){
unsigned int sum = 0;
for (unsigned int y = b_marge; y < t_marge; y++)
sum+= image[y][c*x];
if (sum >= bright*( t_marge-b_marge)){
l_old = x;
break;
}
if (l_old != 0)
break;
}
//find the end of the dark region (the barcode) at right
unsigned int dark_cut = tenth*3*( t_marge-b_marge);
for (int x = l_old; x < (int)p.width ; x++){
unsigned int sum = 0;
for (unsigned int y = b_marge; y < t_marge; y++)
sum+= image[y][c*x];
if (sum <= dark_cut){
r_old = x;
}
}
//find r_old edge
/*for (int x = (int)p.width-1; x > (int)p.width/2 ; x--){
unsigned int sum = 0;
for (unsigned int y = b_marge; y < t_marge; y++)
sum+= image[y][c*x];
if (sum >= bright*( t_marge-b_marge)){
r_old = x;
break;
}
if (r_old != p.width)
break;
}*/
/*for (unsignj
unsigned long window = p.width/12;
int start = l_old - window;
int stop = r_old + window;
if (start < 0)
start = window;
if (stop > p.width)
stop = p.width - window;
vector<unsigned int> scores(stop-start);
for (int x = start; x < stop; x++){
unsigned int vertical_mean(0);
unsigned int vertical_varience(0);
for (unsigned int y = bottom; y < top; y++)
vertical_mean+=image[y][x+window];
vertical_mean/=((2*window+1)*(top-bottom));
}*/
unsigned int left = (11*l_old)/10,
// right = r_old - ((11*(p.width-r_old))/10);
right = r_old + (p.width-r_old)/25;
if (left >= right)
throw ns_ex("ns_barcode_decode::Could not register barcode (horizontal)");
string dbg2_filename;
if (debug_image_filename.size() != 0){
ns_image_standard im;
image.pump(im,1024);
for (int y = bottom; y < top; y++){
im[y][left] = 255*(y%2);
im[y][right] = 255*(y%2);
}
for (unsigned int x = left; x < right; x++){
im[bottom][x] = 255*(x%2);
im[top][x] = 255*(x%2);
}
/*
ns_image_storage_reciever_handle<ns_8_bit> processing_out(image_server.image_storage.request_volatile_storage(debug_image_filename,1024,false));
im.pump(processing_out.output_stream(),1024);
dbg2_filename = ns_dir::extract_filename_without_extension(debug_image_filename) + "2." + ns_dir::extract_extension(debug_image_filename);*/
}
ns_image_bitmap bmp;
ns_image_properties bprop(p);
bprop.components = 1;
bprop.width = right-left;
bprop.height = top-bottom;
bmp.prepare_to_recieve_image(bprop);
const unsigned int read_height(4);
for (unsigned int y = 0; y < read_height; y++)
for (unsigned int x = 0; x < bprop.width; x++)
bmp[y][x] = 0;
for (unsigned int y = read_height; y < bprop.height-read_height; y++){
for (unsigned int x = 0; x < bprop.width; x++){
const int b(y - read_height);
const int t(y + read_height);
int sum(0);
for (int i = b; i < t; i++)
sum+= image[i+bottom][c*left+c*x];
bmp[y][x] = (sum <= (t-b)*thresh);
}
}
for (unsigned int y = 0; y < read_height; y++)
for (unsigned int x = 0; x < bprop.width; x++)
bmp[bprop.height-1-y][x] = 0;
return ns_barcode_decode(bmp,dbg2_filename);
}
