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LayoutAnalysis.cpp
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LayoutAnalysis.cpp
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///////////////////////////////////////////////////////////////////////
// File: LayoutAnalysis.cpp
// Description: Page Layout Analyzer.
// Author: Md. Abul Hasnat
// Organization Center for Research on Bangla Language Processing (CRBLP)
// Version: 0.7
///////////////////////////////////////////////////////////////////////
#include "StdAfx.h"
#include "LayoutAnalysis.h"
LayoutAnalysis::LayoutAnalysis(bool **b, int x, int y)
{
this->plImage = gcnew System::Drawing::Bitmap(y, x);
this->R = x;
this->C = y;
// initialize noise removal array
this->imgArray = new bool * [this->R];
for (int i = 0; i < this->R; i++)
{
this->imgArray[i] = new bool [this->C];
for (int j = 0; j < this->C; j++)
{
if(b[i][j]){
imgArray[i][j] = 1;
this->plImage->SetPixel(j, i, System::Drawing::Color::White);
}else{
imgArray[i][j] = 0;
this->plImage->SetPixel(j, i, System::Drawing::Color::Black);
}
}
}
}// end
LayoutAnalysis::LayoutAnalysis(int **b, int x, int y)
{
this->plImage = gcnew System::Drawing::Bitmap(y, x);
this->R = x;
this->C = y;
// initialize noise removal array
this->imgArray = new bool * [this->R];
for (int i = 0; i < this->R; i++)
{
this->imgArray[i] = new bool [this->C];
for (int j = 0; j < this->C; j++)
{
if(b[i][j]==1){
imgArray[i][j] = 1;
this->plImage->SetPixel(j, i, System::Drawing::Color::White);
}else{
imgArray[i][j] = 0;
this->plImage->SetPixel(j, i, System::Drawing::Color::Black);
}
}
}
}// end
vector<TextBlock> LayoutAnalysis::AnalysisLayout(){
orderLayout = gcnew System::Collections::ArrayList();
int val;
int thresholdValue;
int upB;
int downB;
int leftB;
int rightB;
vector<int> boundary;
vector<TextBlock> textBl;
// get the text boundary of the text document
thresholdValue = 20;
//[I Vb Hb boundary] = getTextBoundary(thresholdValue);
boundary = getTextBoundary(thresholdValue);
upB = boundary[0];
downB = boundary[1];
leftB = boundary[2];
rightB = boundary[3];
// Queue tracker
int f = 0; // front of queue
int b = 0; // back of queue
// add item (Enque) into the Queue
TextBlock tb;
tb.up = upB;
tb.down = downB;
tb.left = leftB;
tb.right = rightB;
tb.split = 'N';
textBl.push_back(tb);
val = textBl.size()-1;
orderLayout->Insert(b, val);
b++;
int up_;
int down_;
int left_;
int right_;
int prevB;
int countGap;
int Avg_Hgap_Ht;
int Std_Hgap_Ht;
int Avg_Lht;
int Std_Lht;
int gapHtTh;
int stdTh;
int numOfLine;
int stLnIndx;
int topBoundary;
int downBoundary;
int internalBlockCount;
int insetIndex;
bool isSplit;
bool split;
vector<int> Hb;
vector<int> Vb;
vector<int> Margine;
vector<int> Gap_index;
vector<int> Gap_zlen;
vector<vector<int>> GapInfo;
vector<int> Line_index;
vector<int> Line_zlen;
vector<vector<int>> LineInfo;
while(f != b){
internalBlockCount = 1;
/// Check Horizontally
up_ = textBl[f].up;
down_ = textBl[f].down;
left_ = textBl[f].left;
right_ = textBl[f].right;
// Pick Item (Deque) from the queue
f = f+1;
prevB = b;
// Get the projection
Hb = getShortProjection(left_, right_, 'H');
// get the up margine and down margine
//[up_ down_] = getMargine(Hb,up_,down_);
Margine = getMargine(Hb, up_, down_);
up_ = Margine[0];
down_ = Margine[1];
// correct the block boundary
textBl[f-1].up = up_;
textBl[f-1].down = down_;
// calculating number of horizontal gap place, their length
// [c HGap_index HGap_zlen] = gapSearch(Hb, up_, down_);
GapInfo = gapSearch(Hb, up_, down_);
Gap_index = GapInfo[0];
Gap_zlen = GapInfo[1];
isSplit = false; // indicate whether the block has been splitted or not
countGap = Gap_index.size();
if(countGap>0){
/// Statistical Information
// finding the average horizontal gap height and standard deviation
Avg_Hgap_Ht = System::Math::Ceiling(getMean(Gap_zlen)); // Avg Horizontal gap Height
Std_Hgap_Ht = System::Math::Ceiling(getStdDev(Gap_zlen)); // Standard deviation Horizontal gap Height
// Finding the Horizontal line height
//[Lht L_index] = blockSearch(HGap_index, HGap_zlen, c, up_, down_);
LineInfo = blockSearch(GapInfo, up_, down_);
Line_index = LineInfo[0];
Line_zlen = LineInfo[1];
Avg_Lht = System::Math::Ceiling(getMean(Line_zlen)); // Avg Line Height
Std_Lht = System::Math::Ceiling(getStdDev(Line_zlen)); // Standard deviation of Line Height
// Determine the paragraph splitter
// c = 1 means there is only one block so we dont have to do anything
gapHtTh = Avg_Hgap_Ht + Std_Hgap_Ht;
if(gapHtTh < 10){
gapHtTh = 10;
}
stdTh = System::Math::Ceiling(Avg_Lht/2);
split = false;
numOfLine = 0;
stLnIndx = 0;
topBoundary = up_;
downBoundary = down_;
for(int i = 0; i<=countGap-1; i++){
split = false;
if(Gap_zlen[i]>=Avg_Lht && Std_Lht<=stdTh){
// This condition is applicable when the standard deviation of the line height is small
split = true;
isSplit = true;
}else if(Std_Lht>stdTh && Avg_Hgap_Ht<=gapHtTh && Gap_zlen[i]>= gapHtTh){
// This condition is applicable when the standard deviation of the
// line height is larger than threshold, the average gap height is
// less than the gap height threshold and the gap height is greater
// than the gap height threshold
split = true;
isSplit = true;
}
if(split){
// add item (Enque) into the Queue
tb.up = topBoundary;
tb.down = Gap_index[i] - 1;
tb.left = left_;
tb.right = right_;
tb.split = 'N';
textBl.push_back(tb);
insetIndex = orderLayout->IndexOf(f-1)+internalBlockCount;
val = textBl.size()-1;
orderLayout->Insert(insetIndex, val);
internalBlockCount++;
topBoundary = textBl[b].down + Gap_zlen[i] + 1;
b++;
}
}
if(isSplit){
// add item (Enque) into the Queue
// for the last text block
tb.up = topBoundary;
tb.down = downBoundary;
tb.left = left_;
tb.right = right_;
tb.split = 'N';
textBl.push_back(tb);
insetIndex = orderLayout->IndexOf(f-1)+internalBlockCount;
val = textBl.size()-1;
orderLayout->Insert(insetIndex, val);
internalBlockCount++;
b++;
}
}
int Avg_Vgap_Wd;
int Std_Vgap_Wd;
int Avg_Bwd;
int Std_Bwd;
int gapLenTh;
int leftBoundary;
int rightBoundary;
vector<int> Block_index;
vector<int> Block_zlen;
vector<vector<int>> BlockInfo;
if(!isSplit /*& countGap>=2*/){
// Check Vertically
// Get the projection
// Vb = getShortProjection(I(up_:down_, :), 'V');
Vb = getShortProjection(up_, down_, 'V');
// get the left margine and right margine
//[left_ right_] = getMargine(Vb,left_,right_);
Margine = getMargine(Vb, left_, right_);
left_ = Margine[0];
right_ = Margine[1];
// correct the block boundary
textBl[f-1].left = left_;
textBl[f-1].right = right_;
// calculating number of vertical gap place, their length
// [c VGap_index VGap_zlen] = gapSearch(Vb, left_, right_);
GapInfo = gapSearch(Vb, left_, right_);
Gap_index = GapInfo[0];
Gap_zlen = GapInfo[1];
countGap = Gap_index.size();
if(countGap>0){
/// Statistical Information
// finding the average vertical gap width and standard deviation
Avg_Vgap_Wd = System::Math::Ceiling(getMean(Gap_zlen)); // Avg Vertical gap Height
Std_Vgap_Wd = System::Math::Ceiling(getStdDev(Gap_zlen)); // Standard deviation Vertical gap Height
// finding the Vertical blocks Width
// [Bwd B_index] = blockSearch(VGap_index, VGap_zlen, c, left_, right_);
BlockInfo = blockSearch(GapInfo, left_, right_);
Block_index = BlockInfo[0];
Block_zlen = BlockInfo[1];
Avg_Bwd = System::Math::Ceiling(getMean(Block_zlen)); // Avg Block Width
Std_Bwd = System::Math::Ceiling(getStdDev(Block_zlen)); // Standard deviation of Block Width
// Calculate whether to split or not
// c = 1 means there is only one block so we dont have to do anything
gapLenTh = 20;
isSplit = false;
leftBoundary = left_;
rightBoundary = right_;
for(int i = 0; i<=countGap-1; i++){
split = false;
if(Gap_zlen[i]>= gapLenTh && Gap_zlen[i]<=System::Math::Abs(Avg_Bwd - Avg_Vgap_Wd)){
// This condition implies that the gap will be a splitter of the text
// block iff it is greater than gapLenTh( Threshold value for the
// Gap Length) and less than the substraction of the average block
// width and average gap width
split = true;
isSplit = true;
}else if(Gap_zlen[i]>= (Std_Vgap_Wd + Avg_Vgap_Wd) && Gap_zlen[i]>System::Math::Abs(Avg_Bwd - Avg_Vgap_Wd)){
// This condition implies that the gap will be a splitter of the text
// block iff it is greater than the addition of Std_Vgap_Wd &
// Avg_Vgap_Wd and also greater than the subtraction of average block
// width and average gap width
split = true;
isSplit = true;
}
if(split && (Block_index[i] + Block_zlen[i] - leftBoundary + 1)>10){
tb.up = up_;
tb.down = down_;
tb.left = leftBoundary;
tb.right = Block_index[i] + Block_zlen[i];
tb.split = 'N';
textBl.push_back(tb);
insetIndex = orderLayout->IndexOf(f-1)+internalBlockCount;
val = textBl.size()-1;
orderLayout->Insert(insetIndex, val);
internalBlockCount++;
leftBoundary = textBl[b].right + Gap_zlen[i] + 1;
b++;
}else if(split && (Block_index[i] + Block_zlen[i] - leftBoundary + 1)<10){
leftBoundary = Block_index[i] + Block_zlen[i] + Gap_zlen[i] + 1;
}
} // for i = 1 : c-1
if(isSplit && (rightBoundary - leftBoundary + 1)>10){
// for the last text block
tb.up = up_;
tb.down = down_;
tb.left = leftBoundary;
tb.right = rightBoundary;
tb.split = 'N';
textBl.push_back(tb);
insetIndex = orderLayout->IndexOf(f-1)+internalBlockCount;
val = textBl.size()-1;
orderLayout->Insert(insetIndex, val);
internalBlockCount++;
b++;
}
} // if(countGap>0)
}else{ // if(isSplit == 0 & c>=3)
// Get the projection
//Vb = getShortProjection(I(up_:down_, :), 'V');
Vb = getShortProjection(up_, down_, 'V');
// get the left margine and right margine
//[left_ right_] = getMargine(Vb,left_,right_);
Margine = getMargine(Vb, left_, right_);
left_ = Margine[0];
right_ = Margine[1];
// correct the block boundary
textBl[f-1].left = left_;
textBl[f-1].right = right_;
} // if(isSplit == 0 & c>=3)
// decided whether the considered block has been splitted or not
if(prevB != b){
textBl[f-1].split = 'Y';
}
} // while(f > 0)
/// PageLayout Ordering
int count = 0;
vector<TextBlock> Block;
int inDx;
if(orderLayout->Count>0){
for(int i = 0; i<orderLayout->Count; i++){
inDx = System::Int32::Parse(orderLayout[i]->ToString());
if(textBl[inDx].split == 'N'){
count++;
Block.push_back(textBl[inDx]);
}
}
}
return Block;
}
void LayoutAnalysis::AnalysisLayoutAndGenerateImage(){
vector<TextBlock> Block = AnalysisLayout();
///// color the layout image /////
int numOfBlock = Block.size();
int lt;
int rt;
int tp;
int bm;
for(int i=0; i<numOfBlock; i++){
lt = Block[i].left;
rt = Block[i].right;
tp = Block[i].up;
bm = Block[i].down;
for(int ii=lt; ii<=rt; ii++){
this->plImage->SetPixel(ii, tp, System::Drawing::Color::Red);
this->plImage->SetPixel(ii, bm, System::Drawing::Color::Red);
}
for(int jj=tp; jj<=bm; jj++){
this->plImage->SetPixel(lt, jj, System::Drawing::Color::Red);
this->plImage->SetPixel(rt, jj, System::Drawing::Color::Red);
}
}
}
vector<int> LayoutAnalysis::getTextBoundary(int thresholdValue){
// size of the Image
int thVal;
int leftMergine;
int rightMergine;
int upMergine;
int downMergine;
System::String^ projectionType;
vector<int> Hb(R);
vector<int> Vb(C);
vector<int> Margine;
thVal = thresholdValue;
/// Finding the Projections and Profiles from pixel projections
/// Vertical (Vb) Projection
projectionType = "V";
//[I Vb] = getProjection(I, 20, 'V');
Vb = getProjection(thVal, 'V');
///// Finding the left and right margine /////
leftMergine = 0;
rightMergine = C-1;
Margine = getMargine(Vb, leftMergine, rightMergine);
leftMergine = Margine[0];
rightMergine = Margine[1];
///// ************************************ /////
///// calculating number of vertical gap place, their length /////
// [c VGap_index VGap_zlen] = gapSearch(Vb, l, r);
vector<int> Gap_index;
vector<int> Gap_zlen;
vector<vector<int>> GapInfo = gapSearch(Vb, leftMergine, rightMergine);
Gap_index = GapInfo[0];
Gap_zlen = GapInfo[1];
///// ************************************ /////
/////////////////////////////////
int countGap = Gap_zlen.size();
float Avg_Vgap_Wd;
float Std_Vgap_Wd;
float Avg_Bwd;
float Std_Bwd;
int len;
int blockLenTh;
int part_len;
vector<vector<int>> BlockInfo;
vector<int> BlkIndex;
vector<int> BlkLen;
if(countGap > 0){
/// Statistical Information
// finding the average vertical gap width and standard deviation
Avg_Vgap_Wd = System::Math::Ceiling(getMean(Gap_zlen)); // Avg Vertical gap Height
Std_Vgap_Wd = System::Math::Ceiling(getStdDev(Gap_zlen)); // Standard deviation Vertical gap Height
///// finding the Vertical blocks Width /////
//[Bwd B_index] = blockSearch(VGap_index, VGap_zlen, c, l, r);
BlockInfo = blockSearch(GapInfo, leftMergine, rightMergine);
BlkIndex = BlockInfo[0];
BlkLen = BlockInfo[1];
///// ************************************ /////
Avg_Bwd = System::Math::Ceiling(getMean(BlkLen)); // Avg Block Width
Std_Bwd = System::Math::Ceiling(getStdDev(BlkLen)); // Standard deviation of Block Width
///// Eliminating the noisy lines /////
len = BlkLen.size();
blockLenTh = 10; // Block Width Threshold
part_len = System::Math::Round(C/8); // Length of the left or right specified boundary
for(int i = 0; i<len; i++){
if((BlkLen[i]<=blockLenTh) && (BlkLen[i] <= System::Math::Abs(Avg_Bwd-Std_Bwd))){
// The condition implies that the Block width must be less than the
// result of the substraction of Avg_Bwd and Std_Bwd and also the
// threshold of the block length
// Vb(B_index(i): B_index(i) + Bwd(i)) = 0;
// I(:,B_index(i): B_index(i) + Bwd(i)) = 1;
int blkStIndx = BlkIndex[i];
int blkEndIndx = BlkIndex[i]+BlkLen[i];
for(int bi=blkStIndx; bi<=blkEndIndx; bi++){
Vb[bi] = 0;
for(int ii=0; ii<R; ii++){
imgArray[ii][bi] = true;
}
}
}
else if((BlkLen[i] <= blockLenTh*2) && (BlkIndex[i]<=blockLenTh)){
// For the big noisy object of the left hand side
// The condition implies that if the Block width is less than twice
// the 'block width threshold value' and the block starting index
// must be less than the 'block width threshold value' to ensure
// that this is not a noisy object due to photocopy
// Vb(B_index(i): B_index(i) + Bwd(i)) = 0;
// I(:,B_index(i): B_index(i) + Bwd(i)) = 1;
int blkStIndx = BlkIndex[i];
int blkEndIndx = BlkIndex[i]+BlkLen[i];
for(int bi=blkStIndx; bi<=blkEndIndx; bi++){
Vb[bi] = 0;
for(int ii=0; ii<R; ii++){
imgArray[ii][bi] = true;
}
}
}
else if((BlkLen[i]<=blockLenTh*2) && (BlkIndex[i]+BlkLen[i] >= rightMergine-blockLenTh)){
// For the big noisy object of the right hand side
// The condition implies that if the Block width is less than twice
// the 'block width threshold value' and the block starting index
// must be less than the 'block width threshold value' to ensure
// that this is not a noisy object due to photocopy
int blkStIndx = BlkIndex[i];
int blkEndIndx = BlkIndex[i]+BlkLen[i];
for(int bi=blkStIndx; bi<=blkEndIndx; bi++){
Vb[bi] = 0;
for(int ii=0; ii<R; ii++){
imgArray[ii][bi] = true;
}
}
}
else if((BlkLen[i]<=blockLenTh*2) && (BlkLen[i]<=System::Math::Abs(Avg_Bwd-Std_Bwd))){
// The condition implies that the Block width must be less than the
// result of the substraction of Avg_Bwd and Std_Bwd and also less
// than or equal to the double of threshold value. The additional
// conditions are: The text block to delete must reside on to the
// 1/8 portion of the total length from left or right side and also
// the gap of the left/right side must be greater or equal to
// abs(Avg_Vgap_Wd - Std_Vgap_Wd)
int Beind = BlkIndex[i] + BlkLen[i]; // Beind : Block End Index
if(i<len & Beind<part_len && ((BlkIndex[i+1]-Beind)>= System::Math::Abs(Avg_Vgap_Wd - Std_Vgap_Wd))){
int blkStIndx = BlkIndex[i];
int blkEndIndx = BlkIndex[i]+BlkLen[i];
for(int bi=blkStIndx; bi<=blkEndIndx; bi++){
Vb[bi] = 0;
for(int ii=0; ii<R; ii++){
imgArray[ii][bi] = true;
}
}
}
else if(i>1 && BlkIndex[i]>(C - part_len) && (BlkIndex[i]- BlkIndex[i-1] + BlkLen[i-1] >= System::Math::Abs(Avg_Vgap_Wd - Std_Vgap_Wd))){
int blkStIndx = BlkIndex[i];
int blkEndIndx = BlkIndex[i]+BlkLen[i];
for(int bi=blkStIndx; bi<=blkEndIndx; bi++){
Vb[bi] = 0;
for(int ii=0; ii<R; ii++){
imgArray[ii][bi] = true;
}
}
}
}
}
///// Re-define the left and right margine /////
//[l r] = getMargine(Vb, l, r);
Margine = getMargine(Vb, leftMergine, rightMergine);
leftMergine = Margine[0];
rightMergine = Margine[1];
}
// free memory
BlkIndex.~vector();
BlkLen.~vector();
BlockInfo.~vector();
Vb.~vector();
//////////////////////////////////////
// Finding the Projections and Profiles from pixel projections
// Horizontal (Hb) Projection
// Threshold Value = 20
//[I Hb] = getProjection(I, 20, 'H');
Hb = getProjection(thVal, 'H');
// finding the up and down margine
//[u d] = getMargine(Hb, u, d);
///// Finding the left and right margine /////
upMergine = 0;
downMergine = R-1;
Margine = getMargine(Hb, upMergine, downMergine);
upMergine = Margine[0];
downMergine = Margine[1];
///// ************************************ /////
// calculating number of horizontal gap place, their length
// [c HGap_index HGap_zlen] = gapSearch(Hb, u, d);
GapInfo = gapSearch(Hb, upMergine, downMergine);
Gap_index = GapInfo[0];
Gap_zlen = GapInfo[1];
///// ************************************ /////
countGap = Gap_zlen.size();
float Avg_Lht;
float Std_Lht;
vector<vector<int>> LineInfo;
vector<int> LineIndex;
vector<int> LineHt;
if(countGap > 0){
/// Statistical Information
// finding the average horizontal gap height and standard deviation
Avg_Vgap_Wd = System::Math::Ceiling(getMean(Gap_zlen)); // Avg Horizontal gap Height
Std_Vgap_Wd = System::Math::Ceiling(getStdDev(Gap_zlen)); // Standard deviation Horizontal gap Height
// finding the Horizontal line height
LineInfo = blockSearch(GapInfo, upMergine, downMergine);
LineIndex = LineInfo[0];
LineHt = LineInfo[1];
Avg_Lht = System::Math::Ceiling(getMean(LineHt)); // Avg Line Height
Std_Lht = System::Math::Ceiling(getStdDev(LineHt)); // Standard deviation of Line Height
// Eliminating the noisy lines
len = LineHt.size();
int LnHtTh = 10; // Line Height Threshold
for(int i = 0; i<len; i++){
if((LineHt[i]<=LnHtTh) && (LineHt[i]<=System::Math::Abs(Avg_Lht-Std_Lht))){
// Hb(L_index(i): L_index(i) + Lht(i)) = 0;
// I(L_index(i): L_index(i) + Lht(i),:) = 1;
int lineStIndx = LineIndex[i];
int lineEndIndx = LineIndex[i]+LineHt[i];
for(int li=lineStIndx; li<=lineEndIndx; li++){
Hb[li] = 0;
for(int jj=0; jj<C; jj++){
imgArray[li][jj] = true;
}
}
}
}
// Re-defined the up and down margine
//[u d] = getMargine(Hb, u, d);
Margine = getMargine(Hb, upMergine, downMergine);
upMergine = Margine[0];
downMergine = Margine[1];
}
// free memory
LineHt.~vector();
LineIndex.~vector();
LineInfo.~vector();
Hb.~vector();
GapInfo.~vector();
Gap_index.~vector();
Gap_zlen.~vector();
Margine.~vector();
// boundary(1) = u;
// boundary(2) = d;
// boundary(3) = l;
// boundary(4) = r;
vector<int> boundary(4);
boundary[0] = upMergine;
boundary[1] = downMergine;
boundary[2] = leftMergine;
boundary[3] = rightMergine;
return boundary;
}
vector<vector<int>> LayoutAnalysis::gapSearch(vector<int> Vb, int lm, int rm){
vector<vector<int>> gapInfo;
/// Initializing
int numZ = 0;
int gapThreshold = 3;
bool conT = false;
vector<int> GapIndx;
vector<int> GapZlen;
for(int i = lm; i<=rm; i++){
if(Vb[i]>0 && !conT){
continue;
}else if(Vb[i]==0 && conT){
numZ = numZ + 1;
}else if(Vb[i]==0 && !conT){
GapIndx.push_back(i);
conT = true;
numZ = numZ + 1;
}else{
if(numZ > gapThreshold){
GapZlen.push_back(numZ);
}else{
GapIndx.pop_back();
}
numZ = 0;
conT = false;
}
}
gapInfo.push_back(GapIndx);
gapInfo.push_back(GapZlen);
return gapInfo;
}
vector<vector<int>> LayoutAnalysis::blockSearch(vector<vector<int>> GapInfo, int lm, int rm){
vector<vector<int>> blockInfo;
vector<int> GapIndex = GapInfo[0];
vector<int> GapZlen = GapInfo[1];
int countGap = GapZlen.size();
// finding the Horizontal line / Vertical blocks Length
vector<int> BlkIndex;
vector<int> BlkLen;
BlkIndex.push_back(lm); // BlkIndex : Line/Block 's starting Index, Ending Index : BlkIndex(i) + BlkLen(i) - 1
BlkLen.push_back(GapIndex[0] - lm); // BlkLen : Line/Block 's Length
for(int i = 1; i<=countGap-1; i++){
BlkIndex.push_back(GapIndex[i-1] + GapZlen[i-1]);
BlkLen.push_back(GapIndex[i] - BlkIndex[i]);
}
// for getting the Length of the last line/block
if((rm - (GapIndex[countGap-1] + GapZlen[countGap-1])) > 0){
BlkIndex.push_back(GapIndex[countGap-1] + GapZlen[countGap-1]);
BlkLen.push_back(rm - BlkIndex[countGap]);
}
blockInfo.push_back(BlkIndex);
blockInfo.push_back(BlkLen);
BlkIndex.~vector();
BlkLen.~vector();
return blockInfo;
}
vector<int> LayoutAnalysis::getProjection(int thVal, char projType){
vector<int> PRJ;
int sum;
if(projType == 'V'){
// Vertical Projection
PRJ.resize(C);
// Get the projection
for(int j = 0; j<C; j++){
sum = 0;
for (int i = 0; i<R; i++){
if(!imgArray[i][j])
sum++;
}
PRJ[j] = sum;
}
// Smoothing the Vertical Projection
for (int j = 2; j<C-2; j++){
sum = 0;
for(int jj = j-2; jj<=j+2; jj++){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[j] = 0;
// I(i,:) = 1;
for (int i = 0; i<R; i++){
imgArray[i][j] = true;
}
}
}
// for the first two rows
sum = 0;
for(int jj = 0; jj<5; jj++){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[0] = 0;
PRJ[1] = 0;
for (int i = 0; i<R; i++){
imgArray[i][0] = true;
imgArray[i][1] = true;
}
}
// for the last two rows
sum = 0;
for(int jj = C-1; jj>=C-5; jj--){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[C-1] = 0;
PRJ[C-2] = 0;
for (int i = 0; i<R; i++){
imgArray[i][C-1] = true;
imgArray[i][C-2] = true;
}
}
}else{
// Horizontal Projection
PRJ.resize(R);
// Get the projection
for(int i = 0; i<R; i++){
sum = 0;
for (int j = 0; j<C; j++){
if(!imgArray[i][j])
sum++;
}
PRJ[i] = sum;
}
// Smoothing the Horizontal Projection
for (int i = 2; i<R-2; i++){
sum = 0;
for(int ii = i-2; ii<=i+2; ii++){
sum += PRJ[ii];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[i] = 0;
// I(i,:) = 1;
for (int j = 0; j<C; j++){
imgArray[i][j] = true;
}
}
}
// for the first two rows
sum = 0;
for(int ii = 0; ii<5; ii++){
sum += PRJ[ii];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[0] = 0;
PRJ[1] = 0;
for (int j = 0; j<C; j++){
imgArray[0][j] = true;
imgArray[1][j] = true;
}
}
// for the last two rows
sum = 0;
for(int ii = R-1; ii>=R-5; ii--){
sum += PRJ[ii];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[R-1] = 0;
PRJ[R-2] = 0;
for (int j = 0; j<C; j++){
imgArray[R-1][j] = true;
imgArray[R-2][j] = true;
}
}
}
return PRJ;
}
vector<int> LayoutAnalysis::getShortProjection(int st, int ed, char projType){
vector<int> PRJ;
int sum;
int thVal = 5;
if(projType == 'V'){
// Vertical Projection
PRJ.resize(C);
// Get the projection
for(int j = 0; j<C; j++){
sum = 0;
for (int i = st; i<=ed; i++){
if(!imgArray[i][j])
sum++;
}
PRJ[j] = sum;
}
// Smoothing the Vertical Projection
for (int j = 2; j<C-2; j++){
sum = 0;
for(int jj = j-2; jj<=j+2; jj++){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[j] = 0;
}
}
// for the first two rows
sum = 0;
for(int jj = 0; jj<5; jj++){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[0] = 0;
PRJ[1] = 0;
}
// for the last two rows
sum = 0;
for(int jj = C-1; jj>=C-5; jj--){
sum += PRJ[jj];
}
if(System::Math::Floor(sum/thVal) == 0){
PRJ[C-1] = 0;
PRJ[C-2] = 0;
}
}else{
// Horizontal Projection
PRJ.resize(R);
// Get the projection
for(int i = 0; i<R; i++){
sum = 0;
for (int j = st; j<=ed; j++){
if(!imgArray[i][j])
sum++;
}
PRJ[i] = sum;
}