Added osd renderer for psm 0.

Works for single page and multi-page.

Author: amitdo

api/baseapi.cpp

@@ -1198,35 +1198,39 @@ bool TessBaseAPI::ProcessPage(Pix* pix, int page_index, const char* filename,
   SetInputName(filename);
   SetImage(pix);
   bool failed = false;
-  if (timeout_millisec > 0) {
+
+  if (tesseract_->tessedit_pageseg_mode == PSM_AUTO_ONLY) {
+    // Disabled character recognition
+    PageIterator* it = AnalyseLayout();
+
+    if (it == NULL) {
+      failed = true;
+    } else {
+      delete it;
+    }
+  } else if (tesseract_->tessedit_pageseg_mode == PSM_OSD_ONLY) {
+    failed = FindLines() != 0;
+  } else if (timeout_millisec > 0) {
     // Running with a timeout.
     ETEXT_DESC monitor;
     monitor.cancel = NULL;
     monitor.cancel_this = NULL;
     monitor.set_deadline_msecs(timeout_millisec);
+
     // Now run the main recognition.
     failed = Recognize(&monitor) < 0;
-  } else if (tesseract_->tessedit_pageseg_mode == PSM_OSD_ONLY ||
-             tesseract_->tessedit_pageseg_mode == PSM_AUTO_ONLY) {
-    // Disabled character recognition.
-    PageIterator* it = AnalyseLayout();
-    if (it == NULL) {
-      failed = true;
-    } else {
-      delete it;
-      PERF_COUNT_END
-      return true;
-    }
   } else {
     // Normal layout and character recognition with no timeout.
     failed = Recognize(NULL) < 0;
   }
+
   if (tesseract_->tessedit_write_images) {
 #ifndef ANDROID_BUILD
     Pix* page_pix = GetThresholdedImage();
     pixWrite("tessinput.tif", page_pix, IFF_TIFF_G4);
 #endif  // ANDROID_BUILD
   }
+
   if (failed && retry_config != NULL && retry_config[0] != '\0') {
     // Save current config variables before switching modes.
     FILE* fp = fopen(kOldVarsFile, "wb");
@@ -1243,6 +1247,7 @@ bool TessBaseAPI::ProcessPage(Pix* pix, int page_index, const char* filename,
   if (renderer && !failed) {
     failed = !renderer->AddImage(this);
   }
+
   PERF_COUNT_END
   return !failed;
 }
@@ -1734,6 +1739,47 @@ char* TessBaseAPI::GetUNLVText() {
   return result;
 }
 
+  /**
+   * The recognized text is returned as a char* which is coded
+   * as UTF8 and must be freed with the delete [] operator.
+   * page_number is a 0-based page index that will appear in the osd file.
+   */
+char* TessBaseAPI::GetOsdText(int page_number) {
+  OSResults osr;
+
+  bool osd = DetectOS(&osr);
+  if (!osd) {
+     return NULL;
+  }
+
+  int orient_id = osr.best_result.orientation_id;
+  int script_id = osr.get_best_script(orient_id);
+  float orient_conf = osr.best_result.oconfidence;
+  float script_conf = osr.best_result.sconfidence;
+  const char* script_name = 
+      osr.unicharset->get_script_from_script_id(script_id);
+
+  // clockwise orientation of the input image, in degrees
+  int orient_deg = orient_id * 90; 
+
+  // clockwise rotation needed to make the page upright
+  int rotate =  OrientationIdToValue(orient_id);
+
+  char* osd_buf = new char[255];
+  snprintf(osd_buf, 255,
+          "Page number: %d\n"
+          "Orientation in degrees: %d\n"
+          "Rotate: %d\n"
+          "Orientation confidence: %.2f\n"
+          "Script: %s\n"
+          "Script confidence: %.2f\n",
+          page_number,
+          orient_deg, rotate, orient_conf,
+          script_name, script_conf);
+
+  return osd_buf;
+}
+
 /** Returns the average word confidence for Tesseract page result. */
 int TessBaseAPI::MeanTextConf() {
   int* conf = AllWordConfidences();

api/baseapi.h

@@ -600,12 +600,21 @@ class TESS_API TessBaseAPI {
    * page_number is a 0-based page index that will appear in the box file.
    */
   char* GetBoxText(int page_number);
+
   /**
    * The recognized text is returned as a char* which is coded
    * as UNLV format Latin-1 with specific reject and suspect codes
    * and must be freed with the delete [] operator.
    */
   char* GetUNLVText();
+
+  /**
+   * The recognized text is returned as a char* which is coded
+   * as UTF8 and must be freed with the delete [] operator.
+   * page_number is a 0-based page index that will appear in the osd file.
+   */
+  char* GetOsdText(int page_number);
+
   /** Returns the (average) confidence value between 0 and 100. */
   int MeanTextConf();
   /**

api/renderer.cpp

@@ -213,4 +213,21 @@ bool TessBoxTextRenderer::AddImageHandler(TessBaseAPI* api) {
   return true;
 }
 
+/**********************************************************************
+ * Osd Text Renderer interface implementation
+ **********************************************************************/
+TessOsdRenderer::TessOsdRenderer(const char* outputbase)
+    : TessResultRenderer(outputbase, "osd") {
+}
+
+bool TessOsdRenderer::AddImageHandler(TessBaseAPI* api) {
+  char* osd = api->GetOsdText(imagenum());
+  if (osd == NULL) return false;
+
+  AppendString(osd);
+  delete[] osd;
+
+  return true;
+}
+
 }  // namespace tesseract

api/renderer.h

@@ -221,6 +221,17 @@ class TESS_API TessBoxTextRenderer : public TessResultRenderer {
   virtual bool AddImageHandler(TessBaseAPI* api);
 };
 
+/**
+ * Renders tesseract output into an osd text string
+ */
+class TESS_API TessOsdRenderer : public TessResultRenderer {
+ public:
+  explicit TessOsdRenderer(const char* outputbase);
+
+ protected:
+  virtual bool AddImageHandler(TessBaseAPI* api);
+};
+
 }  // namespace tesseract.
 
 #endif  // TESSERACT_API_RENDERER_H__

api/tesseractmain.cpp

@@ -242,56 +242,52 @@ int main(int argc, char **argv) {
   if (api.GetPageSegMode() == tesseract::PSM_SINGLE_BLOCK)
      api.SetPageSegMode(pagesegmode);
 
-  if (pagesegmode == tesseract::PSM_AUTO_ONLY ||
-      pagesegmode == tesseract::PSM_OSD_ONLY) {
+  if (pagesegmode == tesseract::PSM_AUTO_ONLY) {
     int ret_val = 0;
 
     Pix* pixs = pixRead(image);
     if (!pixs) {
       fprintf(stderr, "Cannot open input file: %s\n", image);
       exit(2);
     }
+
     api.SetImage(pixs);
 
-    if (pagesegmode == tesseract::PSM_OSD_ONLY) {
-       OSResults osr;
-       if (api.DetectOS(&osr)) {
-         int orient = osr.best_result.orientation_id;
-         int script_id = osr.get_best_script(orient);
-         const char* script_name = 
-             osr.unicharset->get_script_from_script_id(script_id);
-         float orient_oco = osr.best_result.oconfidence;
-         float orient_sco = osr.best_result.sconfidence;
-         tprintf("Orientation: %d\n"
-                 "Orientation in degrees: %d\n"
-                 "Orientation confidence: %.2f\n"
-                 "Script: %s\n"
-                 "Script confidence: %.2f\n",
-                 orient, OrientationIdToValue(orient), orient_oco,
-                 script_name, orient_sco);
-       } else {
-         ret_val = 1;
-       }
+    tesseract::Orientation orientation;
+    tesseract::WritingDirection direction;
+    tesseract::TextlineOrder order;
+    float deskew_angle;
+
+    tesseract::PageIterator* it =  api.AnalyseLayout();
+    if (it) {
+      it->Orientation(&orientation, &direction, &order, &deskew_angle);
+      tprintf("Orientation: %d\nWritingDirection: %d\nTextlineOrder: %d\n" \
+             "Deskew angle: %.4f\n",
+              orientation, direction, order, deskew_angle);
     } else {
-       tesseract::Orientation orientation;
-       tesseract::WritingDirection direction;
-       tesseract::TextlineOrder order;
-       float deskew_angle;
-       tesseract::PageIterator* it =  api.AnalyseLayout();
-       if (it) {
-         it->Orientation(&orientation, &direction, &order, &deskew_angle);
-         tprintf("Orientation: %d\nWritingDirection: %d\nTextlineOrder: %d\n" \
-                 "Deskew angle: %.4f\n",
-                 orientation, direction, order, deskew_angle);
-       } else {
-         ret_val = 1;
-       }
-       delete it;
+      ret_val = 1;
     }
+    
+    delete it;
+    
     pixDestroy(&pixs);
     exit(ret_val);
   }
 
+  if (pagesegmode == tesseract::PSM_OSD_ONLY) {
+    tesseract::TessResultRenderer* renderer = 
+        new tesseract::TessOsdRenderer(outputbase);
+
+    bool succeed = api.ProcessPages(image, NULL, 0, renderer);
+    if (succeed) {
+      PERF_COUNT_END
+     return 0;
+    } else {
+      fprintf(stderr, "Error during processing.\n");
+      exit(1);
+    }
+  }
+
   bool b;
   tesseract::PointerVector<tesseract::TessResultRenderer> renderers;
   api.GetBoolVariable("tessedit_create_hocr", &b);