Fix text box width/hight calculation

In Tesseract's coordinate system, width is just right - left, cf. slide #2 of
github.com/tesseract-ocr/docs/blob/master/das_tutorial2016/2ArchitectureAndDataStructures.pdf

Author: StefRe

api/baseapi.cpp

@@ -1431,8 +1431,8 @@ static void AddBoxToTSV(const PageIterator *it,
   it->BoundingBox(level, &left, &top, &right, &bottom);
   hocr_str->add_str_int("\t", left);
   hocr_str->add_str_int("\t", top);
-  hocr_str->add_str_int("\t", right - left + 1);
-  hocr_str->add_str_int("\t", bottom - top + 1);
+  hocr_str->add_str_int("\t", right - left);
+  hocr_str->add_str_int("\t", bottom - top);
 }
 
 

api/renderer.cpp

@@ -196,7 +196,7 @@ bool TessHOcrRenderer::AddImageHandler(TessBaseAPI* api) {
 }
 
 /**********************************************************************
- * HOcr Text Renderer interface implementation
+ * TSV Text Renderer interface implementation
  **********************************************************************/
 TessTsvRenderer::TessTsvRenderer(const char *outputbase)
     : TessResultRenderer(outputbase, "tsv") {