tesseract::LMConsistencyInfo Struct Reference

#include <lm_consistency.h>

Public Types
enum	ChartypeEnum { CT_NONE, CT_ALPHA, CT_DIGIT, CT_OTHER }

Public Member Functions
	LMConsistencyInfo (const LMConsistencyInfo *parent_info)
int	NumInconsistentPunc () const
int	NumInconsistentCase () const
int	NumInconsistentChartype () const
bool	Consistent () const
int	NumInconsistentSpaces () const
int	InconsistentXHeight () const
void	ComputeXheightConsistency (const BLOB_CHOICE *b, bool is_punc)
float	BodyMinXHeight () const
float	BodyMaxXHeight () const

Public Attributes
int	num_alphas
int	num_digits
int	num_punc
int	num_other
ChartypeEnum	chartype
EDGE_REF	punc_ref
bool	invalid_punc
int	num_non_first_upper
int	num_lower
int	script_id
bool	inconsistent_script
int	num_inconsistent_spaces
bool	inconsistent_font
float	xht_lo [kNumPos]
float	xht_hi [kNumPos]
int16_t	xht_count [kNumPos]
int16_t	xht_count_punc [kNumPos]
int16_t	xht_sp
int16_t	xpos_entropy
XHeightConsistencyEnum	xht_decision

Static Public Attributes
static const int	kShiftThresh = 1
static const int	kMaxEntropy = 1
static const int	kSUB = 0
static const int	kNORM = 1
static const int	kSUP = 2
static const int	kNumPos = 3

Detailed Description

Definition at line 39 of file lm_consistency.h.

Member Enumeration Documentation

ChartypeEnum

enum tesseract::LMConsistencyInfo::ChartypeEnum

Enumerator
CT_NONE
CT_ALPHA
CT_DIGIT
CT_OTHER

Definition at line 40 of file lm_consistency.h.

{ CT_NONE, CT_ALPHA, CT_DIGIT, CT_OTHER};

Constructor & Destructor Documentation

LMConsistencyInfo()

tesseract::LMConsistencyInfo::LMConsistencyInfo ( const LMConsistencyInfo *  parent_info )

inlineexplicit

Definition at line 54 of file lm_consistency.h.

                                                                   {
    if (parent_info == nullptr) {
      // Initialize from scratch.
      num_alphas = 0;
      num_digits = 0;
      num_punc = 0;
      num_other = 0;
      chartype = CT_NONE;
      punc_ref = NO_EDGE;
      invalid_punc = false;
      num_non_first_upper = 0;
      num_lower = 0;
      script_id = 0;
      inconsistent_script = false;
      num_inconsistent_spaces = 0;
      inconsistent_font = false;
      // Initialize XHeight stats.
      for (int i = 0; i < kNumPos; i++) {
        xht_count[i] = 0;
        xht_count_punc[i] = 0;
        xht_lo[i] = 0;
        xht_hi[i] = 256;  // kBlnCellHeight
      }
      xht_sp = -1;  // This invalid value indicates that there was no parent.
      xpos_entropy = 0;
      xht_decision = XH_GOOD;
    } else {
      // Copy parent info
      *this = *parent_info;
    }
  }

Member Function Documentation

BodyMaxXHeight()

float tesseract::LMConsistencyInfo::BodyMaxXHeight ( ) const

inline

Definition at line 112 of file lm_consistency.h.

                               {
    if (InconsistentXHeight())
      return static_cast<float>(INT16_MAX);
    return xht_hi[kNORM];
  }

BodyMinXHeight()

float tesseract::LMConsistencyInfo::BodyMinXHeight ( ) const

inline

Definition at line 107 of file lm_consistency.h.

                               {
    if (InconsistentXHeight())
      return 0.0f;
    return xht_lo[kNORM];
  }

ComputeXheightConsistency()

void tesseract::LMConsistencyInfo::ComputeXheightConsistency	(	const BLOB_CHOICE *	b,
		bool	is_punc
	)

Definition at line 29 of file lm_consistency.cpp.

                                        {
  if (xht_decision == XH_INCONSISTENT)
    return;  // It isn't going to get any better.

  // Compute xheight consistency.
  bool parent_null = xht_sp < 0;
  int parent_sp = xht_sp;
  // Debug strings.
  if (b->yshift() > LMConsistencyInfo::kShiftThresh) {
    xht_sp = LMConsistencyInfo::kSUP;
  } else if (b->yshift() < -LMConsistencyInfo::kShiftThresh) {
    xht_sp = LMConsistencyInfo::kSUB;
  } else {
    xht_sp = LMConsistencyInfo::kNORM;
  }
  xht_count[xht_sp]++;
  if (is_punc) xht_count_punc[xht_sp]++;
  if (!parent_null) {
    xpos_entropy += abs(parent_sp - xht_sp);
  }
  // TODO(eger): Figure out a better way to account for small caps.
  // For the first character not y-shifted, we only care if it is too small.
  // Too large is common in drop caps and small caps.
  // int16_t small_xht = b->min_xheight();
  //  if (parent_vse == nullptr && sp == LanguageModelConsistencyInfo::kNORM) {
  //  small_xht = 0;
  // }
  IntersectRange(b->min_xheight(), b->max_xheight(),
                 &(xht_lo[xht_sp]), &(xht_hi[xht_sp]));


  // Compute xheight inconsistency kinds.
  if (parent_null) {
    if (xht_count[kNORM] == 1) {
      xht_decision = XH_GOOD;
    } else {
      xht_decision = XH_SUBNORMAL;
    }
    return;
  }

  // When we intersect the ranges of xheights in pixels for all characters in
  // each position (subscript, normal, superscript),
  // How much range must be left?  0? [exactly one pixel height for xheight] 1?
  // TODO(eger): Extend this code to take a prior for the rest of the line.
  const int kMinIntersectedXHeightRange = 0;
  for (int i = 0; i < kNumPos; i++) {
    if (xht_lo[i] > xht_hi[i] - kMinIntersectedXHeightRange) {
      xht_decision = XH_INCONSISTENT;
      return;
    }
  }

  // Reject as improbable anything where there's much punctuation in subscript
  // or superscript regions.
  if (xht_count_punc[kSUB] > xht_count[kSUB] * 0.4 ||
      xht_count_punc[kSUP] > xht_count[kSUP] * 0.4) {
    xht_decision = XH_INCONSISTENT;
    return;
  }

  // Now check that the subscript and superscript aren't too small relative to
  // the mainline.
  double mainline_xht = static_cast<double>(xht_lo[kNORM]);
  double kMinSizeRatio = 0.4;
  if (mainline_xht > 0.0 &&
      (static_cast<double>(xht_hi[kSUB]) / mainline_xht < kMinSizeRatio ||
       static_cast<double>(xht_hi[kSUP]) / mainline_xht < kMinSizeRatio)) {
    xht_decision = XH_INCONSISTENT;
    return;
  }
  // TODO(eger): Check into inconsistency of super/subscript y offsets.
  if (xpos_entropy > kMaxEntropy) {
    xht_decision = XH_INCONSISTENT;
    return;
  }
  if (xht_count[kSUB] == 0 && xht_count[kSUP] == 0) {
    xht_decision = XH_GOOD;
    return;
  }
  xht_decision = XH_SUBNORMAL;
}

Consistent()

bool tesseract::LMConsistencyInfo::Consistent ( ) const

inline

Definition at line 95 of file lm_consistency.h.

                                 {
    return (NumInconsistentPunc() == 0 && NumInconsistentCase() == 0 &&
            NumInconsistentChartype() == 0 && !inconsistent_script &&
            !inconsistent_font && !InconsistentXHeight());
  }

InconsistentXHeight()

int tesseract::LMConsistencyInfo::InconsistentXHeight ( ) const

inline

Definition at line 103 of file lm_consistency.h.

                                         {
    return xht_decision == XH_INCONSISTENT;
  }

NumInconsistentCase()

int tesseract::LMConsistencyInfo::NumInconsistentCase ( ) const

inline

Definition at line 88 of file lm_consistency.h.

                                         {
    return (num_non_first_upper > num_lower) ? num_lower : num_non_first_upper;
  }

NumInconsistentChartype()

int tesseract::LMConsistencyInfo::NumInconsistentChartype ( ) const

inline

Definition at line 91 of file lm_consistency.h.

                                             {
    return (NumInconsistentPunc() + num_other +
        ((num_alphas > num_digits) ? num_digits : num_alphas));
  }

NumInconsistentPunc()

int tesseract::LMConsistencyInfo::NumInconsistentPunc ( ) const

inline

Definition at line 85 of file lm_consistency.h.

                                         {
    return invalid_punc ? num_punc : 0;
  }

NumInconsistentSpaces()

int tesseract::LMConsistencyInfo::NumInconsistentSpaces ( ) const

inline

Definition at line 100 of file lm_consistency.h.

                                            {
    return num_inconsistent_spaces;
  }

Member Data Documentation

chartype

ChartypeEnum tesseract::LMConsistencyInfo::chartype

Definition at line 122 of file lm_consistency.h.

inconsistent_font

bool tesseract::LMConsistencyInfo::inconsistent_font

Definition at line 130 of file lm_consistency.h.

inconsistent_script

bool tesseract::LMConsistencyInfo::inconsistent_script

Definition at line 128 of file lm_consistency.h.

invalid_punc

bool tesseract::LMConsistencyInfo::invalid_punc

Definition at line 124 of file lm_consistency.h.

kMaxEntropy

const int tesseract::LMConsistencyInfo::kMaxEntropy = 1

static

Definition at line 48 of file lm_consistency.h.

kNORM

const int tesseract::LMConsistencyInfo::kNORM = 1

static

Definition at line 51 of file lm_consistency.h.

kNumPos

const int tesseract::LMConsistencyInfo::kNumPos = 3

static

Definition at line 52 of file lm_consistency.h.

kShiftThresh

const int tesseract::LMConsistencyInfo::kShiftThresh = 1

static

Definition at line 44 of file lm_consistency.h.

kSUB

const int tesseract::LMConsistencyInfo::kSUB = 0

static

Definition at line 51 of file lm_consistency.h.

kSUP

const int tesseract::LMConsistencyInfo::kSUP = 2

static

Definition at line 51 of file lm_consistency.h.

num_alphas

int tesseract::LMConsistencyInfo::num_alphas

Definition at line 118 of file lm_consistency.h.

num_digits

int tesseract::LMConsistencyInfo::num_digits

Definition at line 119 of file lm_consistency.h.

num_inconsistent_spaces

int tesseract::LMConsistencyInfo::num_inconsistent_spaces

Definition at line 129 of file lm_consistency.h.

num_lower

int tesseract::LMConsistencyInfo::num_lower

Definition at line 126 of file lm_consistency.h.

num_non_first_upper

int tesseract::LMConsistencyInfo::num_non_first_upper

Definition at line 125 of file lm_consistency.h.

num_other

int tesseract::LMConsistencyInfo::num_other

Definition at line 121 of file lm_consistency.h.

num_punc

int tesseract::LMConsistencyInfo::num_punc

Definition at line 120 of file lm_consistency.h.

punc_ref

EDGE_REF tesseract::LMConsistencyInfo::punc_ref

Definition at line 123 of file lm_consistency.h.

script_id

int tesseract::LMConsistencyInfo::script_id

Definition at line 127 of file lm_consistency.h.

xht_count

int16_t tesseract::LMConsistencyInfo::xht_count[kNumPos]

Definition at line 134 of file lm_consistency.h.

xht_count_punc

int16_t tesseract::LMConsistencyInfo::xht_count_punc[kNumPos]

Definition at line 135 of file lm_consistency.h.

xht_decision

XHeightConsistencyEnum tesseract::LMConsistencyInfo::xht_decision

Definition at line 138 of file lm_consistency.h.

xht_hi

float tesseract::LMConsistencyInfo::xht_hi[kNumPos]

Definition at line 133 of file lm_consistency.h.

xht_lo

float tesseract::LMConsistencyInfo::xht_lo[kNumPos]

Definition at line 132 of file lm_consistency.h.

xht_sp

int16_t tesseract::LMConsistencyInfo::xht_sp

Definition at line 136 of file lm_consistency.h.

xpos_entropy

int16_t tesseract::LMConsistencyInfo::xpos_entropy

Definition at line 137 of file lm_consistency.h.

---

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

• /usr/src/tesseract-ocr.master/src/wordrec/lm_consistency.h
• /usr/src/tesseract-ocr.master/src/wordrec/lm_consistency.cpp