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details FindBoundingRectangle Class Reference VIGRA

Calculate the bounding rectangle of an ROI in an image. More...

#include <vigra/inspectimage.hxx>

List of all members.

Public Types

typedef Diff2D argument_type
typedef Rect2D result_type
typedef Diff2D value_type

Public Member Functions

 FindBoundingRectangle ()
void operator() (argument_type const &coord)
void operator() (FindBoundingRectangle const &otherRegion)
result_type operator() () const
void reset ()
Size2D size () const

Public Attributes

Point2D lowerRight
Point2D upperLeft
bool valid

Detailed Description

Calculate the bounding rectangle of an ROI in an image.

As always in VIGRA, roiRect.lowerRight is just outside the rectangle. That is, the last pixel actually in the rectangle is roiRect.lowerRight - Diff2D(1,1). This Functor is often used in conjunction with ArrayOfRegionStatistics to find the bounding rectangles of all regions in a labeled image.

Traits defined:

FunctorTraits::isUnaryAnalyser and FunctorTraits::isInitializer are true (VigraTrueType)

Usage:

#include <vigra/inspectimage.hxx>
Namespace: vigra

    vigra::BImage img, mask;
    ...

    vigra::FindBoundingRectangle roiRect;   // init functor

    // Diff2D is used as the iterator for the source image. This
    // simulates an image where each pixel value equals the pixel's
    // coordinates. The image 'mask' determines the ROI.
    vigra::inspectImageIf(srcIterRange(Diff2D(0,0), (Diff2D)img.size()),
                          srcImage(mask), roiRect);

    cout << "Upper left of ROI: " <<
        roiRect.upperLeft.x << ", " << roiRect.upperLeft.y << endl;
    cout << "Lower right of ROI: " <<
        roiRect.lowerRight.x << ", " << roiRect.lowerRight.y << endl;

Member Typedef Documentation

the functor's argument type

the functors result type

typedef Diff2D value_type
Deprecated:
use argument_type

Constructor & Destructor Documentation

init rectangle to invalid values


Member Function Documentation

void reset ( )

(re-)init functor to find other bounds

void operator() ( argument_type const &  coord)

update rectangle by including the coordinate coord

void operator() ( FindBoundingRectangle const &  otherRegion)

update rectangle by merging it with another rectangle

Size2D size ( ) const

Get size of current rectangle.

result_type operator() ( ) const

Get current rectangle. result_type::first is the upper left corner of the rectangle, result_type::second the lower right.


Member Data Documentation

Upper left of the region as seen so far

Lower right of the region as seen so far

bool valid

are the functors contents valid ?


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

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

html generated using doxygen and Python
vigra 1.9.0 (Tue Nov 6 2012)