Exemple #1
0
        public List <List <float> > SpaceCosts(List <Candidate> candidates, Bytearray image)
        {
            /*
             *  Given a list of character recognition candidates and their
             *  classifications, and an image of the corresponding text line,
             *  compute a list of pairs of costs for putting/not putting a space
             *  after each of the candidate characters.
             *
             *  The basic idea behind this simple algorithm is to try larger
             *  and larger horizontal closing operations until most of the components
             *  start having a "wide" aspect ratio; that's when characters have merged
             *  into words.  The remaining whitespace should be spaces.
             *
             *  This is just a simple stopgap measure; it will be replaced with
             *  trainable space modeling.
             */
            int w = image.Dim(0);
            int h = image.Dim(1);

            Bytearray closed = new Bytearray();
            int       r;

            for (r = 0; r < maxrange; r++)
            {
                if (r > 0)
                {
                    closed.Copy(image);
                    Morph.binary_close_circle(closed, r);
                }
                else
                {
                    closed.Copy(image);
                }
                Intarray labeled = new Intarray();
                labeled.Copy(closed);
                ImgLabels.label_components(ref labeled);
                Narray <Rect> rects = new Narray <Rect>();
                ImgLabels.bounding_boxes(ref rects, labeled);
                Floatarray aspects = new Floatarray();
                for (int i = 0; i < rects.Length(); i++)
                {
                    Rect  rect   = rects[i];
                    float aspect = rect.Aspect();
                    aspects.Push(aspect);
                }
                float maspect = NarrayUtil.Median(aspects);
                if (maspect >= this.aspect_threshold)
                {
                    break;
                }
            }

            // close with a little bit of extra space
            closed.Copy(image);
            Morph.binary_close_circle(closed, r + 1);

            // compute the remaining aps
            //Morph.binary_dilate_circle();

            // every character box that ends near a cap gets a space appended


            return(null);
        }