#include <ccnontextdetect.h>

Inheritance diagram for tesseract::CCNonTextDetect:

Public Member Functions
	CCNonTextDetect (int gridsize, const ICOORD &bleft, const ICOORD &tright)

	~CCNonTextDetect () override

Image	ComputeNonTextMask (bool debug, Image photo_map, TO_BLOCK *blob_block)

Public Member Functions inherited from tesseract::BlobGrid
	BlobGrid (int gridsize, const ICOORD &bleft, const ICOORD &tright)

	~BlobGrid () override

void	InsertBlobList (BLOBNBOX_LIST *blobs)

Public Member Functions inherited from tesseract::BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT >
	BBGrid ()

	BBGrid (int gridsize, const ICOORD &bleft, const ICOORD &tright)

	~BBGrid () override

void	Init (int gridsize, const ICOORD &bleft, const ICOORD &tright)

void	Clear ()

void	ClearGridData (void(free_method)(BLOBNBOX ))

void	InsertBBox (bool h_spread, bool v_spread, BLOBNBOX *bbox)

void	InsertPixPtBBox (int left, int bottom, Image pix, BLOBNBOX *bbox)

void	RemoveBBox (BLOBNBOX *bbox)

bool	RectangleEmpty (const TBOX &rect)

IntGrid *	CountCellElements ()

ScrollView *	MakeWindow (int x, int y, const char *window_name)

void	DisplayBoxes (ScrollView *window)

void	AssertNoDuplicates ()

virtual void	HandleClick (int x, int y)

Public Member Functions inherited from tesseract::GridBase
	GridBase ()=default

	GridBase (int gridsize, const ICOORD &bleft, const ICOORD &tright)

virtual	~GridBase ()

void	Init (int gridsize, const ICOORD &bleft, const ICOORD &tright)

int	gridsize () const

int	gridwidth () const

int	gridheight () const

const ICOORD &	bleft () const

const ICOORD &	tright () const

void	GridCoords (int x, int y, int grid_x, int grid_y) const

void	ClipGridCoords (int x, int y) const

Additional Inherited Members
Protected Attributes inherited from tesseract::BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT >
BLOBNBOX_CLIST *	grid_

Protected Attributes inherited from tesseract::GridBase
int	gridsize_

int	gridwidth_

int	gridheight_

int	gridbuckets_

ICOORD	bleft_

ICOORD	tright_

Detailed Description

Definition at line 31 of file ccnontextdetect.h.

Constructor & Destructor Documentation

◆ CCNonTextDetect()

tesseract::CCNonTextDetect::CCNonTextDetect	(	int	gridsize,
		const ICOORD &	bleft,
		const ICOORD &	tright
	)

Definition at line 62 of file ccnontextdetect.cpp.

     : BlobGrid(gridsize, bleft, tright)
     , max_noise_count_(static_cast<int>(kMaxSmallNeighboursPerPix * gridsize * gridsize))
     , noise_density_(nullptr) {
   // TODO(rays) break max_noise_count_ out into an area-proportional
   // value, as now plus an additive constant for the number of text blobs
   // in the 3x3 neighbourhood - maybe 9.
 }

◆ ~CCNonTextDetect()

tesseract::CCNonTextDetect::~CCNonTextDetect ( )

override

Definition at line 71 of file ccnontextdetect.cpp.

                                   {
   delete noise_density_;
 }

Member Function Documentation

◆ ComputeNonTextMask()

Image tesseract::CCNonTextDetect::ComputeNonTextMask	(	bool	debug,
		Image	photo_map,
		TO_BLOCK *	blob_block
	)

Definition at line 84 of file ccnontextdetect.cpp.

                                                                                            {
   // Insert the smallest blobs into the grid.
   InsertBlobList(&blob_block->small_blobs);
   InsertBlobList(&blob_block->noise_blobs);
   // Add the medium blobs that don't have a good strokewidth neighbour.
   // Those that do go into good_grid as an antidote to spreading beyond the
   // real reaches of a noise region.
   BlobGrid good_grid(gridsize(), bleft(), tright());
   BLOBNBOX_IT blob_it(&blob_block->blobs);
   for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
     BLOBNBOX *blob = blob_it.data();
     double perimeter_area_ratio = blob->cblob()->perimeter() / 4.0;
     perimeter_area_ratio *= perimeter_area_ratio / blob->enclosed_area();
     if (blob->GoodTextBlob() == 0 || perimeter_area_ratio < kMinGoodTextPARatio) {
       InsertBBox(true, true, blob);
     } else {
       good_grid.InsertBBox(true, true, blob);
     }
   }
   noise_density_ = ComputeNoiseDensity(debug, photo_map, &good_grid);
   good_grid.Clear(); // Not needed any more.
   Image pix = noise_density_->ThresholdToPix(max_noise_count_);
   if (debug) {
     pixWrite("junknoisemask.png", pix, IFF_PNG);
   }
   ScrollView *win = nullptr;
 #ifndef GRAPHICS_DISABLED
   if (debug) {
     win = MakeWindow(0, 400, "Photo Mask Blobs");
   }
 #endif // !GRAPHICS_DISABLED
   // Large and medium blobs are not text if they overlap with "a lot" of small
   // blobs.
   MarkAndDeleteNonTextBlobs(&blob_block->large_blobs, kMaxLargeOverlapsWithSmall, win,
                             ScrollView::DARK_GREEN, pix);
   MarkAndDeleteNonTextBlobs(&blob_block->blobs, kMaxMediumOverlapsWithSmall, win, ScrollView::WHITE,
                             pix);
   // Clear the grid of small blobs and insert the medium blobs.
   Clear();
   InsertBlobList(&blob_block->blobs);
   MarkAndDeleteNonTextBlobs(&blob_block->large_blobs, kMaxLargeOverlapsWithMedium, win,
                             ScrollView::DARK_GREEN, pix);
   // Clear again before we start deleting the blobs in the grid.
   Clear();
   MarkAndDeleteNonTextBlobs(&blob_block->noise_blobs, -1, win, ScrollView::CORAL, pix);
   MarkAndDeleteNonTextBlobs(&blob_block->small_blobs, -1, win, ScrollView::GOLDENROD, pix);
   MarkAndDeleteNonTextBlobs(&blob_block->blobs, -1, win, ScrollView::WHITE, pix);
   if (debug) {
 #ifndef GRAPHICS_DISABLED
     win->Update();
 #endif // !GRAPHICS_DISABLED
     pixWrite("junkccphotomask.png", pix, IFF_PNG);
 #ifndef GRAPHICS_DISABLED
     delete win->AwaitEvent(SVET_DESTROY);
     delete win;
 #endif // !GRAPHICS_DISABLED
   }
   return pix;
 }

The documentation for this class was generated from the following files:

src/textord/ccnontextdetect.h
src/textord/ccnontextdetect.cpp