Tesseract 3.02

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Public Member Functions
tesseract::CubeSearchObject Class Reference

`#include <cube_search_object.h>`

Inheritance diagram for tesseract::CubeSearchObject:

List of all members.

## Public Member Functions

| CubeSearchObject (CubeRecoContext *cntxt, CharSamp *samp)
| ~CubeSearchObject ()
int | SegPtCnt ()
CharAltList * | RecognizeSegment (int start_pt, int end_pt)
CharSamp * | CharSample (int start_pt, int end_pt)
Box * | CharBox (int start_pt, int end_pt)
int | SpaceCost (int seg_pt)
int | NoSpaceCost (int seg_pt)
int | NoSpaceCost (int seg_pt, int end_pt)
Public Member Functions inherited from tesseract::SearchObject
| SearchObject (CubeRecoContext *cntxt)
virtual | ~SearchObject ()

## Additional Inherited Members

Protected Attributes inherited from tesseract::SearchObject
CubeRecoContext * | cntxt_

## Detailed Description

Definition at line 41 of file cube_search_object.h.

## Constructor & Destructor Documentation

tesseract::CubeSearchObject::CubeSearchObject | ( | CubeRecoContext * | cntxt,
|  | CharSamp * | samp
| ) |  |

Definition at line 28 of file cube_search_object.cpp.

: SearchObject(cntxt) {
init_ = false;
reco_cache_ = NULL;
samp_cache_ = NULL;
segments_ = NULL;
segment_cnt_ = 0;
samp_ = samp;
left_ = 0;
itop_ = 0;
space_cost_ = NULL;
no_space_cost_ = NULL;
wid_ = samp_->Width();
hgt_ = samp_->Height();
max_seg_per_char_ = cntxt_->Params()->MaxSegPerChar();
rtl_ = (cntxt_->ReadingOrder() == CubeRecoContext::R2L);
min_spc_gap_ =
static_cast<int>(hgt_ * cntxt_->Params()->MinSpaceHeightRatio());
max_spc_gap_ =
static_cast<int>(hgt_ * cntxt_->Params()->MaxSpaceHeightRatio());
}

tesseract::CubeSearchObject::~CubeSearchObject | ( |  | ) |

Definition at line 50 of file cube_search_object.cpp.

{
Cleanup();
}

## Member Function Documentation

Box * tesseract::CubeSearchObject::CharBox | ( | int | start_pt,
|  | int | end_pt
| ) |  |

virtual

Implements tesseract::SearchObject.

Definition at line 228 of file cube_search_object.cpp.

{
if (!init_ && !Init())
return NULL;
if (!IsValidSegmentRange(start_pt, end_pt)) {
fprintf(stderr, "Cube ERROR (CubeSearchObject::CharBox): invalid "
"segment range (%d, %d)\n", start_pt, end_pt);
return NULL;
}
// create a char samp object from the specified range of segments,
// extract its dimensions into a leptonica box, and delete it
bool left_most;
bool right_most;
CharSamp *samp = CharSamp::FromConComps(segments_, start_pt + 1,
end_pt - start_pt, NULL,
&left_most, &right_most, hgt_);
if (!samp)
return NULL;
if (kUseCroppedChars) {
CharSamp *cropped_samp = samp->Crop();
delete samp;
if (!cropped_samp) {
return NULL;
}
samp = cropped_samp;
}
Box *box = boxCreate(samp->Left(), samp->Top(),
samp->Width(), samp->Height());
delete samp;
return box;
}

CharSamp * tesseract::CubeSearchObject::CharSample | ( | int | start_pt,
|  | int | end_pt
| ) |  |

virtual

Implements tesseract::SearchObject.

Definition at line 168 of file cube_search_object.cpp.

{
// init if necessary
if (!init_ && !Init())
return NULL;
// validate segment range
if (!IsValidSegmentRange(start_pt, end_pt))
return NULL;
// look for the samp in the cache
if (samp_cache_ && samp_cache_[start_pt + 1] &&
samp_cache_[start_pt + 1][end_pt]) {
return samp_cache_[start_pt + 1][end_pt];
}
// create a char samp object from the specified range of segments
bool left_most;
bool right_most;
CharSamp *samp = CharSamp::FromConComps(segments_, start_pt + 1,
end_pt - start_pt, NULL,
&left_most, &right_most, hgt_);
if (!samp)
return NULL;
if (kUseCroppedChars) {
CharSamp *cropped_samp = samp->Crop();
// we no longer need the orig sample
delete samp;
if (!cropped_samp)
return NULL;
samp = cropped_samp;
}
// get the dimensions of the new cropped sample
int char_top = samp->Top();
int char_wid = samp->Width();
int char_hgt = samp->Height();
// for cursive languages, these features correspond to whether
// the charsamp is at the beginning or end of conncomp
if (cntxt_->Cursive() == true) {
// first and last char flags depend on reading order
bool first_char = rtl_ ? right_most : left_most;
bool last_char = rtl_ ? left_most : right_most;
samp->SetFirstChar(first_char ? 255 : 0);
samp->SetLastChar(last_char ? 255 : 0);
} else {
// for non cursive languages, these features correspond
// to whether the charsamp is at the begining or end of the word
samp->SetFirstChar((start_pt == -1) ? 255 : 0);
samp->SetLastChar((end_pt == (segment_cnt_ - 1)) ? 255 : 0);
}
samp->SetNormTop(255 * char_top / hgt_);
samp->SetNormBottom(255 * (char_top + char_hgt) / hgt_);
samp->SetNormAspectRatio(255 * char_wid / (char_wid + char_hgt));
// add to cache & return
samp_cache_[start_pt + 1][end_pt] = samp;
return samp;
}

int tesseract::CubeSearchObject::NoSpaceCost | ( | int | seg_pt | ) |

virtual

Implements tesseract::SearchObject.

Definition at line 437 of file cube_search_object.cpp.

{
// If failed to compute costs, return a 1.0 prob
if (!space_cost_ && !ComputeSpaceCosts())
return CubeUtils::Prob2Cost(0.0);
return no_space_cost_[pt_idx];
}

int tesseract::CubeSearchObject::NoSpaceCost | ( | int | seg_pt,
|  | int | end_pt
| ) |  |

virtual

Implements tesseract::SearchObject.

Definition at line 446 of file cube_search_object.cpp.

{
// If fail to compute costs, return a 1.0 prob
if (!space_cost_ && !ComputeSpaceCosts())
return CubeUtils::Prob2Cost(1.0);
int no_spc_cost = 0;
for (int pt_idx = st_pt + 1; pt_idx < end_pt; pt_idx++)
no_spc_cost += NoSpaceCost(pt_idx);
return no_spc_cost;
}

CharAltList * tesseract::CubeSearchObject::RecognizeSegment | ( | int | start_pt,
|  | int | end_pt
| ) |  |

virtual

Implements tesseract::SearchObject.

Definition at line 262 of file cube_search_object.cpp.

{
// init if necessary
if (!init_ && !Init()) {
fprintf(stderr, "Cube ERROR (CubeSearchObject::RecognizeSegment): could "
"not initialize CubeSearchObject\n");
return NULL;
}
// validate segment range
if (!IsValidSegmentRange(start_pt, end_pt)) {
fprintf(stderr, "Cube ERROR (CubeSearchObject::RecognizeSegment): invalid "
"segment range (%d, %d)\n", start_pt, end_pt);
return NULL;
}
// look for the recognition results in cache in the cache
if (reco_cache_ && reco_cache_[start_pt + 1] &&
reco_cache_[start_pt + 1][end_pt]) {
return reco_cache_[start_pt + 1][end_pt];
}
// create the char sample corresponding to the blob
CharSamp *samp = CharSample(start_pt, end_pt);
if (!samp) {
fprintf(stderr, "Cube ERROR (CubeSearchObject::RecognizeSegment): could "
"not construct CharSamp\n");
return NULL;
}
// recognize the char sample
CharClassifier *char_classifier = cntxt_->Classifier();
if (char_classifier) {
reco_cache_[start_pt + 1][end_pt] = char_classifier->Classify(samp);
} else {
// no classifer: all characters are equally probable; add a penalty
// that favors 2-segment characters and aspect ratios (w/h) > 1
fprintf(stderr, "Cube WARNING (CubeSearchObject::RecognizeSegment): cube "
"context has no character classifier!! Inventing a probability "
"distribution.\n");
int class_cnt = cntxt_->CharacterSet()->ClassCount();
CharAltList *alt_list = new CharAltList(cntxt_->CharacterSet(), class_cnt);
int seg_cnt = end_pt - start_pt;
double prob_val = (1.0 / class_cnt) *
exp(-abs(seg_cnt - 2.0)) *
exp(-samp->Width() / static_cast<double>(samp->Height()));
if (alt_list) {
for (int class_idx = 0; class_idx < class_cnt; class_idx++) {
alt_list->Insert(class_idx, CubeUtils::Prob2Cost(prob_val));
}
reco_cache_[start_pt + 1][end_pt] = alt_list;
}
}
return reco_cache_[start_pt + 1][end_pt];
}

int tesseract::CubeSearchObject::SegPtCnt | ( |  | ) |

virtual

Implements tesseract::SearchObject.

Definition at line 114 of file cube_search_object.cpp.

{
if (!init_ && !Init())
return -1;
return segment_cnt_ - 1;
}

int tesseract::CubeSearchObject::SpaceCost | ( | int | seg_pt | ) |

virtual

Implements tesseract::SearchObject.

Definition at line 427 of file cube_search_object.cpp.

{
if (!space_cost_ && !ComputeSpaceCosts()) {
// Failed to compute costs return a zero prob
return CubeUtils::Prob2Cost(0.0);
}
return space_cost_[pt_idx];
}

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

- /mnt/data/src/tesseract-ocr/cube/cube_search_object.h
- /mnt/data/src/tesseract-ocr/cube/cube_search_object.cpp