tesseract 4.1.1
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tesseract::CCNonTextDetect Class Reference

#include <ccnontextdetect.h>

Inheritance diagram for tesseract::CCNonTextDetect:
tesseract::BlobGrid tesseract::BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT > tesseract::GridBase

Public Member Functions

 CCNonTextDetect (int gridsize, const ICOORD &bleft, const ICOORD &tright)
 
 ~CCNonTextDetect () override
 
Pix * ComputeNonTextMask (bool debug, Pix *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, Pix *pix, BLOBNBOX *bbox)
 
void RemoveBBox (BLOBNBOX *bbox)
 
bool RectangleEmpty (const TBOX &rect)
 
IntGridCountCellElements ()
 
ScrollViewMakeWindow (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 ICOORDbleft () const
 
const ICOORDtright () 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.

65 max_noise_count_(static_cast<int>(kMaxSmallNeighboursPerPix *
67 noise_density_(nullptr) {
68 // TODO(rays) break max_noise_count_ out into an area-proportional
69 // value, as now plus an additive constant for the number of text blobs
70 // in the 3x3 neighbourhood - maybe 9.
71}
const double kMaxSmallNeighboursPerPix
int gridsize() const
Definition: bbgrid.h:63
const ICOORD & bleft() const
Definition: bbgrid.h:72
const ICOORD & tright() const
Definition: bbgrid.h:75
BlobGrid(int gridsize, const ICOORD &bleft, const ICOORD &tright)
Definition: blobgrid.cpp:24

◆ ~CCNonTextDetect()

tesseract::CCNonTextDetect::~CCNonTextDetect ( )
override

Definition at line 73 of file ccnontextdetect.cpp.

73 {
74 delete noise_density_;
75}

Member Function Documentation

◆ ComputeNonTextMask()

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

Definition at line 86 of file ccnontextdetect.cpp.

87 {
88 // Insert the smallest blobs into the grid.
89 InsertBlobList(&blob_block->small_blobs);
90 InsertBlobList(&blob_block->noise_blobs);
91 // Add the medium blobs that don't have a good strokewidth neighbour.
92 // Those that do go into good_grid as an antidote to spreading beyond the
93 // real reaches of a noise region.
94 BlobGrid good_grid(gridsize(), bleft(), tright());
95 BLOBNBOX_IT blob_it(&blob_block->blobs);
96 for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
97 BLOBNBOX* blob = blob_it.data();
98 double perimeter_area_ratio = blob->cblob()->perimeter() / 4.0;
99 perimeter_area_ratio *= perimeter_area_ratio / blob->enclosed_area();
100 if (blob->GoodTextBlob() == 0 || perimeter_area_ratio < kMinGoodTextPARatio)
101 InsertBBox(true, true, blob);
102 else
103 good_grid.InsertBBox(true, true, blob);
104 }
105 noise_density_ = ComputeNoiseDensity(debug, photo_map, &good_grid);
106 good_grid.Clear(); // Not needed any more.
107 Pix* pix = noise_density_->ThresholdToPix(max_noise_count_);
108 if (debug) {
109 pixWrite("junknoisemask.png", pix, IFF_PNG);
110 }
111 ScrollView* win = nullptr;
112 #ifndef GRAPHICS_DISABLED
113 if (debug) {
114 win = MakeWindow(0, 400, "Photo Mask Blobs");
115 }
116 #endif // GRAPHICS_DISABLED
117 // Large and medium blobs are not text if they overlap with "a lot" of small
118 // blobs.
119 MarkAndDeleteNonTextBlobs(&blob_block->large_blobs,
121 win, ScrollView::DARK_GREEN, pix);
122 MarkAndDeleteNonTextBlobs(&blob_block->blobs, kMaxMediumOverlapsWithSmall,
123 win, ScrollView::WHITE, pix);
124 // Clear the grid of small blobs and insert the medium blobs.
125 Clear();
126 InsertBlobList(&blob_block->blobs);
127 MarkAndDeleteNonTextBlobs(&blob_block->large_blobs,
129 win, ScrollView::DARK_GREEN, pix);
130 // Clear again before we start deleting the blobs in the grid.
131 Clear();
132 MarkAndDeleteNonTextBlobs(&blob_block->noise_blobs, -1,
133 win, ScrollView::CORAL, pix);
134 MarkAndDeleteNonTextBlobs(&blob_block->small_blobs, -1,
135 win, ScrollView::GOLDENROD, pix);
136 MarkAndDeleteNonTextBlobs(&blob_block->blobs, -1,
137 win, ScrollView::WHITE, pix);
138 if (debug) {
139 #ifndef GRAPHICS_DISABLED
140 win->Update();
141 #endif // GRAPHICS_DISABLED
142 pixWrite("junkccphotomask.png", pix, IFF_PNG);
143 #ifndef GRAPHICS_DISABLED
144 delete win->AwaitEvent(SVET_DESTROY);
145 delete win;
146 #endif // GRAPHICS_DISABLED
147 }
148 return pix;
149}
@ SVET_DESTROY
Definition: scrollview.h:46
const double kMinGoodTextPARatio
const int kMaxMediumOverlapsWithSmall
const int kMaxLargeOverlapsWithMedium
const int kMaxLargeOverlapsWithSmall
C_BLOB * cblob() const
Definition: blobbox.h:268
int GoodTextBlob() const
Definition: blobbox.cpp:226
int32_t enclosed_area() const
Definition: blobbox.h:253
BLOBNBOX_LIST blobs
Definition: blobbox.h:772
BLOBNBOX_LIST noise_blobs
Definition: blobbox.h:774
BLOBNBOX_LIST large_blobs
Definition: blobbox.h:776
BLOBNBOX_LIST small_blobs
Definition: blobbox.h:775
int32_t perimeter()
Definition: stepblob.cpp:292
Pix * ThresholdToPix(int threshold) const
Definition: bbgrid.cpp:190
void InsertBBox(bool h_spread, bool v_spread, BLOBNBOX *bbox)
Definition: bbgrid.h:486
ScrollView * MakeWindow(int x, int y, const char *window_name)
Definition: bbgrid.h:589
void InsertBlobList(BLOBNBOX_LIST *blobs)
Definition: blobgrid.cpp:36
static void Update()
Definition: scrollview.cpp:709
SVEvent * AwaitEvent(SVEventType type)
Definition: scrollview.cpp:443

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