| // Copyright 2006 Google Inc. |
| // All Rights Reserved. |
| // Author: <renn@google.com> (Marius Renn) |
| // |
| // This file contains the PerspectiveDetection class, which can detect the |
| // surface points a given mask lies on. Currently, this has been tested for |
| // text masks only, so the usefulness for other objects remains to be |
| // evaluated. |
| // The obtained surface is used for dewarping the text, using the Dewarp(...) |
| // method of the Surface class. See there for details. |
| // |
| #ifndef HELIUM_PERSPECTIVEDETECTION_H__ |
| #define HELIUM_PERSPECTIVEDETECTION_H__ |
| |
| #include "surface.h" |
| |
| namespace helium { |
| |
| class Mask; |
| |
| // This class contains one static method, that returns the Surface a given mask |
| // lies on. |
| class PerspectiveDetection { |
| public: |
| // Using the given mask, attempts to find the four points, that specify |
| // the surface, that the mask lies on. |
| // The implementation sends the mask to Tesseract, which detects the bottom |
| // and top baseline. |
| // If Tesseract returns bogus information (no baseline, or too many), this |
| // method returns false. |
| // TODO: Detect the left and right bounding lines by analyzing the italics |
| // of the characters. Currently, this method assumes straight vertical |
| // lines. |
| static bool DetectSurface(const Mask& mask, Surface& surface); |
| }; |
| |
| } // namespace |
| |
| #endif // HELIUM_PERSPECTIVEDETECTION_H__ |
