/// <summary>
///
/// </summary>
/// <param name="input_img">original image</param>
/// <param name="type"></param>
/// <returns></returns>
public static List <Image <Gray, byte> > find_all_possible_plates(Image <Gray, byte> input_img, Plate_feature.type_of_plate type)
{
Image <Gray, byte> blur = Image_utils.gaussian_blur(input_img);
Image <Gray, byte> sobelx = Image_utils.sobel_X(blur).Convert <Gray, byte>();
Image <Gray, byte> adaptive = Image_utils.adaptive_threshold(sobelx);
Image <Gray, byte> morp = Image_utils.morphology_ex(adaptive, Plate_feature.type_of_plate.RECT_PLATE);
VectorOfVectorOfPoint contours = Image_utils.find_all_contours(morp);
List <Image <Gray, byte> > approved_plates = new List <Image <Gray, byte> >();
for (int i = 0; i < contours.Size; i++)
{
double area = CvInvoke.ContourArea(contours[i]);
Rectangle r = CvInvoke.BoundingRectangle(contours[i]);
RotatedRect rr = CvInvoke.MinAreaRect(contours[i]);
Image <Gray, byte> suspected_plate = input_img.Copy(r);
Tuple <Image <Gray, byte>, Rectangle> after_clean_plate_tuple;
Tuple <bool, List <Image <Gray, byte> > > after_check_plate_has_characters_tuple;
if (!Plate_feature.ratio_check(type, area, r.Width, r.Height))
{
continue;
}
else
{
if (!Plate_feature.validate_rotation_and_ratio(type, rr))
{
continue;
}
else
{
after_clean_plate_tuple = clean_plate(suspected_plate, type);
after_check_plate_has_characters_tuple = check_plate_has_character(after_clean_plate_tuple.Item1, type);
if (!after_check_plate_has_characters_tuple.Item1)
{
continue;
}
else
{
approved_plates = after_check_plate_has_characters_tuple.Item2;
}
}
}
}
return(approved_plates);
}
/// <summary>
///
/// </summary>
/// <param name="plate">plate cropped from original image</param>
/// <returns>List of images of characters</returns>
public static List <Image <Gray, byte> > segment_characters_from_plate(Image <Gray, byte> plate)
{
List <Image <Gray, byte> > segmented_characters = new List <Image <Gray, byte> >();
//Image<Gray, byte> blur_plate = Image_utils.gaussian_blur(plate);
Image <Gray, byte> threshold_plate = Image_utils.adaptive_threshold(plate);
//Image<Gray, byte> threshold_plate = plate.ThresholdBinary(new Gray(100), new Gray(255));
//CvInvoke.Imshow("plate", threshold_plate);
VectorOfVectorOfPoint contours = Image_utils.find_all_contours(threshold_plate);
List <VectorOfPoint> hulls = get_convex_hull(plate, contours);
Image <Gray, byte> hull_img = new Image <Gray, byte>(plate.Width, plate.Height, new Gray(0));
foreach (VectorOfPoint hull in hulls)
{
CvInvoke.FillConvexPoly(hull_img, hull, new MCvScalar(255));
}
//CvInvoke.Imshow("hull", hull_img);
VectorOfVectorOfPoint final_contours = Image_utils.find_all_contours(hull_img);
if (final_contours == null)
{
return(segmented_characters);
}
Dictionary <Rectangle, VectorOfPoint> dict_to_order = new Dictionary <Rectangle, VectorOfPoint>();
for (int i = 0; i < final_contours.Size; i++)
{
Rectangle r = CvInvoke.BoundingRectangle(final_contours[i]);
dict_to_order.Add(r, final_contours[i]);
}
List <VectorOfPoint> ordered_contours = new List <VectorOfPoint>();
var ordered_result = dict_to_order.OrderByDescending(i => i.Key.X);
foreach (KeyValuePair <Rectangle, VectorOfPoint> kvp in ordered_result)
{
ordered_contours.Add(kvp.Value);
Image <Gray, byte> character = plate.Copy(kvp.Key);
segmented_characters.Add(character);
}
//CvInvoke.WaitKey();
//CvInvoke.DestroyAllWindows();
return(segmented_characters);
}