tesseract::LocalCorrelation Class Reference

Classes
struct	float_pair

Public Member Functions
	LocalCorrelation ()
	~LocalCorrelation ()=default
void	Finish ()
void	Clear ()
void	Add (float x, float y, int v)
float	EstimateYFor (float x, float r)

Detailed Description

Definition at line 111 of file cjkpitch.cpp.

Constructor & Destructor Documentation

LocalCorrelation()

tesseract::LocalCorrelation::LocalCorrelation ( )

inline

Definition at line 118 of file cjkpitch.cpp.

: finalized_(false) {}

~LocalCorrelation()

tesseract::LocalCorrelation::~LocalCorrelation ( )

default

Member Function Documentation

Add()

void tesseract::LocalCorrelation::Add ( float  x, float  y, int  v  )

inline

Definition at line 130 of file cjkpitch.cpp.

                                    {
    struct float_pair value;
    value.x = x;
    value.y = y;
    value.vote = v;
    values_.push_back(value);
    finalized_ = false;
  }

Clear()

void tesseract::LocalCorrelation::Clear ( )

inline

Definition at line 126 of file cjkpitch.cpp.

               {
    finalized_ = false;
  }

EstimateYFor()

float tesseract::LocalCorrelation::EstimateYFor ( float  x, float  r  )

inline

Definition at line 139 of file cjkpitch.cpp.

                                       {
    ASSERT_HOST(finalized_);
    unsigned start = 0, end = values_.size();
    // Because the number of samples (used_) is assumed to be small,
    // just use linear search to find values within the range.
    while (start < values_.size() && values_[start].x < x * (1 - r)) {
      start++;
    }
    while (end > 0 && values_[end - 1].x > x * (1 + r)) {
      end--;
    }
 
    // Fall back to the global average if there are no data within r
    // of x.
    if (start >= end) {
      start = 0;
      end = values_.size();
    }
 
    // Compute weighted average of the values.
    float rc = 0;
    int vote = 0;
    for (auto i = start; i < end; i++) {
      rc += values_[i].vote * x * values_[i].y / values_[i].x;
      vote += values_[i].vote;
    }
 
    return vote == 0 ? 0.0f : rc / vote;
  }

Finish()

void tesseract::LocalCorrelation::Finish ( )

inline

Definition at line 121 of file cjkpitch.cpp.

                {
    std::sort(values_.begin(), values_.end(), float_pair_compare);
    finalized_ = true;
  }

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

• /media/home/debian/src/github/tesseract-ocr/tesseract/src/textord/cjkpitch.cpp