Rect *ccGetAndLabelConnectedComponentsBBox( Image  * img, Matrix  ** rectMatrix )

Extract the connected components’ boxes from the image and builds a mtr that ‘labels’ the components, giving fast access to a pixels’ corresponding Rect.

Rect *ccGetConnectedComponentsBBox( Image  * img )

Extract the connected components’ boxes from the image.

Matrix *ccLabelConnectedComponents( Image  * img, int  * num_components )

Label the connected components of an image using a UnionFind approach.

Column *column( int  x1, int  y1, int  x2, int  y2, Column  * next )

Creates a new Column

Column *columnGetPageColumns( Image  * img, Rect  * characters, int  n_tries, double  (*quality)  (Rect *r), int  (*columnClassifier)  (Rect *, Rect *) )

Finds at maximum n_tries from the page.

int columnIsColumnSeparator( Rect  * r, Rect  * characters )

Checks if a Rect is a column separator.

double columnQuality( Rect  * r )

Returns a quality to use with the rectMaximalWhiteRectangles.

Image **columnSplitImageByColumns( Image  * img, Column  * col, int  * n_sections )

Split the image in separate column images.

IplImage *convertImage( Image  * img )

Converts an Image to the IplImage used in OpenCV.

Image *convertIplImage( IplImage  * img )

Converts an IplImage to the Image type of smartreader.

void convolution( Image  * img, Kernel  * k )

Does the convolution of the image img with the Kernel k

void HitMiss( Image  * src, Image  * dest, HitMissElement  * se )

Do the HitMiss operation in a 8-bit unsigned binary image.

HitMissElement *hitMissCircle( int  radius )

Create a circular structuring element with the specified radius

HitMissElement *hitMissElement( Matrix  * m )

Creates a new HitMissElement.

HitMissElement *hitMissElement2( Matrix  * m, int  anchorx, int  anchory )

Creates a new HitMissElement with a pre defined center.

void hitMissElementDelete( HitMissElement  * se )

Creates a new HitMissElement.

HitMissElement *hitMissRectangle( int  w, int  h )

Create a rectangular structuring element

Image *image( int  width, int  height, int  n_channels )

Creates a new image

Image *imageClone( Image  * img )

Returns a clone of img.

void imageDelete( Image  * img )

Delete the image

void imageDrawRect( Image  * img, Rect  * r, Color  color, int  filled )

Draws all the Rects in a IplImage using color.

int imageGet( Image  * img, int  i, int  j, int  n )

Gets the value at position i, j from a the n-th channel of the image.

int imageGrayGet( Image  * img, int  i, int  j )

Gets the value at position i, j from a gray image.If the parameters are invalid returns 0.

void imageGraySet( Image  * img, int  i, int  j, int  value )

Sets the value at position i, j from a gray image

Image *imageReadPGM( char  * path )

Reads a PGM image from path.

void imageSavePGM( Image  * img, char  * path )

Save an image to the file system

void imageSet( Image  * img, int  i, int  j, int  n, int  value )

Sets the value at position i, j in the n-th channel of an image

void imgRLSAH( Image  * img, int  C )

Do a horizontal run-lenght smoothing algorithm

Kernel *kernel( Matrix  * values, int  anchorx, int  anchory )

Creates a new kernel to be used with a convolution or hit and miss operation.

void kernelDelete( Kernel  * k )

Deletes a kernel created by another function

Rect *rect( int  x1, int  y1, int  x2, int  y2, double  fill, Rect  * next )

Creates a new Rect or adds a new Rect to a list

double rectArea( Rect  * r )

Returns the area of the Rect.

Rect *rectClosest( Rect  * r, int  x, int  y )

Returns the closest Rect to the (x, y) point

Rect *rectCopy( Rect  * r )

Makes a copy of a Rect

void rectDelete( Rect  * r )

Frees the memory used by a Rect

double rectDistance( Rect  * r1, Rect  * r2 )

Returns the between two Rects

Rect *rectFilter( Rect  * r, int  criteria, double  min, double  max )

Filter the Rects on the list based on a criteria.

int rectIntersects( Rect  * r1, Rect  * r2 )

Check if the Rects intersect each other

int rectIsValid( Rect  * r )

Checks if the Rect is valid (left < right and top < bottom)

Rect *rectMaximalWhiteRectangles( Rect  * bound, Rect  * obstacles, int  N, double  (*quality)(Rect *r) )

An implementation of the algorithm described in “T.

int rectPointInside( Rect  * r, int  x, int  y )

Checks if the passed point is inside the Rect

void rectPQDelete( RectPQ  * pq )

Delete the priority queue

RectPQ *rectPQEnqueue( RectPQ  * pq, Rect  * bound, Rect  * obstacles, double  quality )

Enqueue a triple of bound, obstacles and quality

RectPQ *rectPQGet( RectPQ  * pq, Rect  ** bound, Rect  ** obstacles, double  * q )

Get the best element of the queue

RectPQ *rectPQUpdate( RectPQ  * pq, Rect  * new )

For every element, add new to the obstacles list if new intersects bound

void rectPrint( char  * msg, Rect  * r )

Prints all the Rects in r preceded by msg

int rectRectInside( Rect  * r, Rect  * r2 )

Checks if a Rect is inside another

double skewDetectAvilaLins( Image  * img )

Detects the skew of a document page using the technice described in Ávila B.T., Lins R.D., “A Fast Orientation and Skew Detection Algorithm for Monochromatic Document Images”.

double skewDetectGatos( Image  * img, double  max_skew )

Detects the skew of a document page using the technice described in B.

int UFFind( UF  * set, int  a )

Finds the top-most parent of the element a.

UF *UFJoin( UF  * set, int  a, int  b )

Creates the structure to use the unionfind algorithm

UF *UFNew( int  max_sets )

Creates the structure to use the unionfind algorithm