OL_BUCKETS Class Reference

#include <edgblob.h>

Collaboration diagram for OL_BUCKETS:

Public Member Functions
	~OL_BUCKETS ()=default
C_OUTLINE_LIST *	start_scan ()
C_OUTLINE_LIST *	scan_next ()
OL_BUCKETS::OL_BUCKETS
Construct an array of buckets for associating outlines into blobs.
	OL_BUCKETS (ICOORD bleft, ICOORD tright)
OL_BUCKETS::operator(
Return a pointer to a list of C_OUTLINEs corresponding to the given pixel coordinates.
C_OUTLINE_LIST *	operator() (int16_t x, int16_t y)
OL_BUCKETS::count_children
Find number of descendants of this outline.
int32_t	count_children (C_OUTLINE *outline, int32_t max_count)
OL_BUCKETS::outline_complexity
This is the new version of count_child. The goal of this function is to determine if an outline and its interiors could be part of a character blob. This is done by computing a "complexity" index for the outline, which is the return value of this function, and checking it against a threshold. The max_count is used for short-circuiting the recursion and forcing a rejection that guarantees to fail the threshold test. The complexity F for outline X with N children X[i] is F(X) = N + sum_i F(X[i]) * edges_children_per_grandchild so each layer of nesting increases complexity exponentially. An outline can be rejected as a text blob candidate if its complexity is too high, has too many children(likely a container), or has too many layers of nested inner loops. This has the side-effect of flattening out boxed or reversed video text regions.
int32_t	outline_complexity (C_OUTLINE *outline, int32_t max_count, int16_t depth)
OL_BUCKETS::extract_children
Find number of descendants of this outline.
void	extract_children (C_OUTLINE *outline, C_OUTLINE_IT *it)

Private Attributes
std::unique_ptr< C_OUTLINE_LIST[]>	buckets
int16_t	bxdim
int16_t	bydim
ICOORD	bl
ICOORD	tr
int32_t	index

Constructor & Destructor Documentation

OL_BUCKETS()

OL_BUCKETS::OL_BUCKETS	(	ICOORD	bleft,
		ICOORD	tright
	)

~OL_BUCKETS()

OL_BUCKETS::~OL_BUCKETS ( )

default

Member Function Documentation

count_children()

int32_t OL_BUCKETS::count_children	(	C_OUTLINE *	outline,
		int32_t	max_count
	)

extract_children()

void OL_BUCKETS::extract_children	(	C_OUTLINE *	outline,
		C_OUTLINE_IT *	it
	)

operator()()

C_OUTLINE_LIST * OL_BUCKETS::operator()	(	int16_t	x,
		int16_t	y
	)

outline_complexity()

int32_t OL_BUCKETS::outline_complexity	(	C_OUTLINE *	outline,
		int32_t	max_count,
		int16_t	depth
	)

scan_next()

C_OUTLINE_LIST* OL_BUCKETS::scan_next ( )

inline

start_scan()

C_OUTLINE_LIST* OL_BUCKETS::start_scan ( )

inline

Member Data Documentation

bl

ICOORD OL_BUCKETS::bl

private

buckets

std::unique_ptr<C_OUTLINE_LIST[]> OL_BUCKETS::buckets

private

bxdim

int16_t OL_BUCKETS::bxdim

private

bydim

int16_t OL_BUCKETS::bydim

private

index

int32_t OL_BUCKETS::index

private

tr

ICOORD OL_BUCKETS::tr

private

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

• /home/stephane/src/tesseract/src/textord/edgblob.h
• /home/stephane/src/tesseract/src/textord/edgblob.cpp