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Skeletonize.cpp
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/*
* File: Skeletonize.cpp
* Author: heshan
*
* Created on April 11, 2017, 8:39 PM
*/
#include <iostream>
#include <Magick++.h>
#include "Skeletonize.h"
Skeletonize::Skeletonize(std::string inputImage, std::string outputImage) {
initializeImage(inputImage);
reconfPixels();
while(1)
{
getArticulationPoints();
//printBoundaryPixelMatrix();
removeBoundaryPixels();
//printBoundaryPixelMatrix();
//printReconfedMatrix();
if (this->interiorPixels == 0) break;
}
for(int i = 0; i < 20; i++){
getArticulationPointsPhase2();
removeBoundaryPixelsPhase2();
}
for(int i = 0; i < 5; i++){
}
//printBoundaryPixelMatrix();
//printReconfedMatrix();
writeImage(outputImage);
}
Skeletonize::Skeletonize(const Skeletonize& orig) {}
Skeletonize::~Skeletonize() {}
int Skeletonize::initializeImage(std::string path){
Magick::InitializeMagick(NULL);
Magick::Image image(path);
this->img = image;
this->interiorPixels = 0;
try {
image.type( Magick::GrayscaleType );
image.modifyImage();
int w = image.columns(),h = image.rows();
int row = 0,column = 0;
int range = pow(2, image.modulusDepth());
Magick::PixelPacket *pixels = image.getPixels(0, 0, w, h);
// creating the pixel matrices
this->imageMatrix = new float*[h];for(int i = 0; i < h; ++i) this->imageMatrix[i] = new float[w];
this->reconfedImageMatrix = new float*[h];for(int i = 0; i < h; ++i) this->reconfedImageMatrix[i] = new float[w];
this->boundaryPixelMatrix = new float*[h];for(int i = 0; i < h; ++i) this->boundaryPixelMatrix[i] = new float[w];
// storing meta data
this->width = w; this->height = h;
this->range = range;
for(row = 0; row < h; row++)
{
for(column = 0; column < w; column++)
{
Magick::Color color = pixels[w * row + column];
this->imageMatrix[row][column] = (color.redQuantum()/range)/256;
}
//std::cout<< std::endl;
}
} catch(std::exception &error_ ) {
std::cout << "Caught exception: " << error_.what() << std::endl;
return 1;
}
return 0;
}
int Skeletonize::reconfPixels(){
for(int row = 0; row < (this->height); row++)
{
for(int column = 0; column < (this->width); column++)
{
if (this->imageMatrix[row][column] > 0.7 ) this->reconfedImageMatrix[row][column] = 1; // thresholding
else this->reconfedImageMatrix[row][column] = 0;
}
}
return 0;
}
int Skeletonize::getArticulationPoints(){
int tmpInPix = this->interiorPixels;
this->interiorPixels = 0;
for(int row = 0; row < (this->height); row++)
{
for(int column = 0; column < (this->width); column++)
{
//reconfedImageMatrix[row-1][column-1];
//reconfedImageMatrix[row-1][column+1];
//reconfedImageMatrix[row+1][column-1];
//reconfedImageMatrix[row+1][column+1];
if ( (column == 0) || (column == (this->width)-1) || (row == 0) || (row == (this->height) -1) ) {
boundaryPixelMatrix[row][column] = reconfedImageMatrix[row][column];
} else {
if (( reconfedImageMatrix[row-1][column] == 1) &
( reconfedImageMatrix[row][column-1] == 1) &
( reconfedImageMatrix[row][column+1] == 1) &
( reconfedImageMatrix[row+1][column] == 1) ) { boundaryPixelMatrix[row][column] = 2; this->interiorPixels++;}
else boundaryPixelMatrix[row][column] = reconfedImageMatrix[row][column];
}
}
}
if ( tmpInPix == this->interiorPixels ) this->interiorPixels = 0;
return 0;
}
int Skeletonize::getArticulationPointsPhase2(){
int tmpInPix = this->interiorPixels;
this->interiorPixels = 0;
int tmpPoints;
for(int row = 0; row < (this->height); row++)
{
for(int column = 0; column < (this->width); column++)
{
tmpPoints = 0;
if ( (column == 0) || (column == (this->width)-1) || (row == 0) || (row == (this->height) -1) ) {
boundaryPixelMatrix[row][column] = reconfedImageMatrix[row][column];
} else {
if ( reconfedImageMatrix[row-1][column] == 1) tmpPoints++;
if ( reconfedImageMatrix[row][column-1] == 1) tmpPoints++;
if ( reconfedImageMatrix[row][column+1] == 1) tmpPoints++;
if ( reconfedImageMatrix[row+1][column] == 1) tmpPoints++;
if (tmpPoints == 3) { boundaryPixelMatrix[row][column] = 3; reconfedImageMatrix[row][column] = 1; this->interiorPixels++;}
else boundaryPixelMatrix[row][column] = reconfedImageMatrix[row][column];
}
}
}
if ( tmpInPix == this->interiorPixels ) this->interiorPixels = 0;
return 0;
}
int Skeletonize::removeBoundaryPixels(){
for(int row = 1; row < (this->height)-1; row++)
{
for(int column = 1; column < (this->width)-1; column++)
{
if (boundaryPixelMatrix[row][column] == 1)
{
/*
* |a2 a3 a4|
* |a1 ** a5|
* |a8 a7 a6|
*/
int a1,a2,a3,a4,a5,a6,a7,a8;
a1 = boundaryPixelMatrix[row][column-1];
a3 = boundaryPixelMatrix[row-1][column];
a5 = boundaryPixelMatrix[row][column+1];
a7 = boundaryPixelMatrix[row+1][column];
a2 = boundaryPixelMatrix[row-1][column-1];
a4 = boundaryPixelMatrix[row-1][column+1];
a6 = boundaryPixelMatrix[row+1][column+1];
a8 = boundaryPixelMatrix[row+1][column-1];
int tmpPointSum = 0;
if( (a1 > 2) || (a2 > 2) || (a3 > 2) || (a4 > 2) || (a5 > 2) || (a6 > 2) || (a7 > 2) || (a8 > 2) )
{
if (a1 > 0) tmpPointSum++;
if (a3 > 0) tmpPointSum++;
if (a5 > 0) tmpPointSum++;
if (a7 > 0) tmpPointSum++;
if (tmpPointSum > 2)
{
boundaryPixelMatrix[row][column] = 0;
reconfedImageMatrix[row][column] = 0;
}
else if (tmpPointSum == 2)
{
int removable = 0;
if( (a1 == 0) & (a2 == 0) & (a3 == 0) ) {
removable = 1;
} else if( (a1 == 0) & (a8 == 0) & (a7 == 0) ){
removable = 1;
} else if( (a3 == 0) & (a4 == 0) & (a5 == 0) ){
removable = 1;
} else if( (a5 == 0) & (a6 == 0) & (a7 == 0) ){
removable = 1;
}
if (removable == 1)
{
boundaryPixelMatrix[row][column] = 0;
reconfedImageMatrix[row][column] = 0;
}
}
}
}
}
//std::cout<<"\n";
}
return 0;
}
int Skeletonize::removeBoundaryPixelsPhase2(){
for(int row = 1; row < (this->height)-1; row++)
{
for(int column = 1; column < (this->width)-1; column++)
{
/*
* |a2 a3 a4|
* |a1 ** a5|
* |a8 a7 a6|
*/
int a1,a2,a3,a4,a5,a6,a7,a8;
a1 = boundaryPixelMatrix[row][column-1];
a3 = boundaryPixelMatrix[row-1][column];
a5 = boundaryPixelMatrix[row][column+1];
a7 = boundaryPixelMatrix[row+1][column];
a2 = boundaryPixelMatrix[row-1][column-1];
a4 = boundaryPixelMatrix[row-1][column+1];
a6 = boundaryPixelMatrix[row+1][column+1];
a8 = boundaryPixelMatrix[row+1][column-1];
int tmpPointSum = 0;
if( (a1 > 2) || (a2 > 2) || (a3 > 2) || (a4 > 2) || (a5 > 2) || (a6 > 2) || (a7 > 2) || (a8 > 2) )
{
if (a1 > 0) tmpPointSum++;
if (a3 > 0) tmpPointSum++;
if (a5 > 0) tmpPointSum++;
if (a7 > 0) tmpPointSum++;
if (tmpPointSum > 2)
{
boundaryPixelMatrix[row][column] = 0;
reconfedImageMatrix[row][column] = 0;
}
else if (tmpPointSum == 2)
{
int removable = 0;
if( (a1 == 0) & (a2 == 0) & (a3 == 0) ) {
removable = 1;
} else if( (a1 == 0) & (a8 == 0) & (a7 == 0) ){
removable = 1;
} else if( (a3 == 0) & (a4 == 0) & (a5 == 0) ){
removable = 1;
} else if( (a5 == 0) & (a6 == 0) & (a7 == 0) ){
removable = 1;
}
if (removable == 1)
{
boundaryPixelMatrix[row][column] = 0;
reconfedImageMatrix[row][column] = 0;
}
}
}
}
//std::cout<<"\n";
}
return 0;
}
int Skeletonize::writeImage(std::string path){
Magick::Image image;
image = this->img;
image.modifyImage();
image.type(Magick::TrueColorType);
ssize_t columns = this->width;
Magick::PixelPacket *pixel_cache = image.getPixels(0,0,this->width, this->height);
for(int i = 0; i < this->width; i++)
{
for(int j = 0; j < this->height; j++)
{
Magick::ColorGray gColor(this->reconfedImageMatrix[j][i]);
Magick::PixelPacket *pixel = pixel_cache+j*columns+i;
*pixel = gColor;
}
}
image.syncPixels();
image.write(path);
return 0;
}
int Skeletonize::printReconfedMatrix(){
std::cout<<"Reconfigured Matrix: \n";
for(int row = 0; row < (this->height); row++)
{
for(int column = 0; column < (this->width); column++)
{
std::cout<<this->reconfedImageMatrix[row][column]<<" ";
}
std::cout<<"\n";
}
std::cout<<"\n\n\n\n";
return 0;
}
int Skeletonize::printBoundaryPixelMatrix(){
std::cout<<"Boundary Pixel Matrix: \n";
for(int row = 0; row < (this->height); row++)
{
for(int column = 0; column < (this->width); column++)
{
std::cout<<this->boundaryPixelMatrix[row][column]<<" ";
}
std::cout<<"\n";
}
std::cout<<"\n\n\n\n";
return 0;
}