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CaptchaVerification.java
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import java.io.*;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
class CaptchaVerification{
final int limit=5;
final int halfLimit=(int)Math.sqrt((limit*limit)/2);
private BufferedImage takingTheImageInput(){
try{
File file = new File("captcha.jpg");
BufferedImage bufferedImage = new BufferedImage(1000, 1000, BufferedImage.TYPE_INT_ARGB);
bufferedImage = ImageIO.read(file);
return bufferedImage;
}
catch(Exception exception){
System.out.println("Cannot input the image. Exception: "+exception);
System.exit(0);
return null;
}
}
private void threasholdTheImage(BufferedImage bufferedImage){
for(int i=0;i<bufferedImage.getWidth();i++){
for(int j=0;j<bufferedImage.getHeight();j++){
int color = bufferedImage.getRGB(i, j);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
if(red<100 && blue<100 && green<100){
red=0;
blue=0;
green=0;
int rgb = (red << 16 | green << 8 | blue);
bufferedImage.setRGB(i, j, rgb);
}
}
}
}
private void swappingColors(BufferedImage bufferedImage){
for(int i=0;i<bufferedImage.getWidth();i++){
for(int j=0;j<bufferedImage.getHeight();j++){
int color = bufferedImage.getRGB(i, j);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
if(red>180 && blue>180 && green>180){
red=0;
blue=0;
green=0;
}
else{
red=255;
blue=255;
green=255;
}
int rgb = (red << 16 | green << 8 | blue);
bufferedImage.setRGB(i, j, rgb);
}
}
}
private void modifingTheBlackishLine(BufferedImage bufferedImage){
//Height is rows
//Width is column
//Background is 122 122 122
int timesRepeat=1;
while(timesRepeat-->=0){
for(int i=0;i<bufferedImage.getWidth();i++){
for(int j=0;j<bufferedImage.getHeight();j++){
int color = bufferedImage.getRGB(i, j);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
if(red <100 && blue < 100 && green < 100){
if(searchColor(bufferedImage, i, j)){
red=255;
blue=255;
green=255;
}
else{
red=0;
blue=0;
green=0;
}
int rgb = (red << 16 | green << 8 | blue);
bufferedImage.setRGB(i, j, rgb);
}
}
}
}
threasholdTheImage(bufferedImage);
swappingColors(bufferedImage);
writeTheModifiedImage(bufferedImage);
}
private void writeTheModifiedImage(BufferedImage bufferedImage){
File ImageFile = new File("transformed.jpg");
try {
ImageIO.write(bufferedImage, "jpg", ImageFile);
} catch (IOException e) {
System.out.println("Cannot write the image.");
}
}
private boolean searchColor(BufferedImage bufferedImage, int row, int column){
//1 means white
//-1 means black
int top=topSearch(bufferedImage, row, column);
int bottom=bottomSearch(bufferedImage, row, column);
int start=startSearch(bufferedImage, row, column);
int end=endSearch(bufferedImage, row, column);
int leftTop=leftTopSearch(bufferedImage, row, column);
int rightTop=rightTopSearch(bufferedImage, row, column);
int leftBottom=leftBottomSearch(bufferedImage, row, column);
int rightBottom=rightBottomSearch(bufferedImage, row, column);
if(top+bottom+start+end+leftTop+rightTop+leftBottom+rightBottom > 3)
return true;
//true means a letter and hence white color
//black means not a letter and hence black color
return false;
}
private int topSearch(BufferedImage bufferedImage, int row, int column){
int copy=row;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row>0 && red==0 && blue==0 && green==0){
row--;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in TOPSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && copy-row<=limit)
return 1;
return 0;
}
private int bottomSearch(BufferedImage bufferedImage, int row, int column){
int copy=row;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row<bufferedImage.getWidth()-1 && red==0 && blue==0 && green==0){
row++;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in BOTTOMSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && row-copy<=limit)
return 1;
return 0;
}
private int startSearch(BufferedImage bufferedImage, int row, int column){
int copy=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(column>0 && red==0 && blue==0 && green==0){
column--;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in STARTSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && copy-column<=limit)
return 1;
return 0;
}
private int endSearch(BufferedImage bufferedImage, int row, int column){
int copy=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(column<bufferedImage.getHeight()-1 && red==0 && blue==0 && green==0){
column++;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in ENDSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && column-copy<=limit)
return 1;
return 0;
}
private int leftTopSearch(BufferedImage bufferedImage, int row, int column){
int copyRow=row;
int copyColumn=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row>0 && column>0 && red==0 && blue==0 && green==0){
row--;
column--;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in LEFTTOPSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && copyRow-row<=halfLimit && copyColumn-column<=halfLimit)
return 1;
return 0;
}
private int rightTopSearch(BufferedImage bufferedImage, int row, int column){
int copyRow=row;
int copyColumn=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row<bufferedImage.getWidth()-1 && column>0 && red==0 && blue==0 && green==0){
row++;
column--;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in RIGHTTOPSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && row-copyRow<=halfLimit && copyColumn-column<=halfLimit)
return 1;
return 0;
}
private int leftBottomSearch(BufferedImage bufferedImage, int row, int column){
int copyRow=row;
int copyColumn=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row>0 && column<bufferedImage.getHeight()-1 && red==0 && blue==0 && green==0){
row--;
column++;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in LEFTBOTTOMSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && copyRow-row<=halfLimit && column-copyColumn<=halfLimit)
return 1;
return 0;
}
private int rightBottomSearch(BufferedImage bufferedImage, int row, int column){
int copyRow=row;
int copyColumn=column;
int color=bufferedImage.getRGB(row, column);
int blue = color & 0xff;
int green = (color & 0xff00) >> 8;
int red = (color & 0xff0000) >> 16;
try{
while(row<bufferedImage.getWidth()-1 && column<bufferedImage.getHeight()-1 && red==0 && blue==0 && green==0){
row++;
column++;
color=bufferedImage.getRGB(row, column);
blue = color & 0xff;
green = (color & 0xff00) >> 8;
red = (color & 0xff0000) >> 16;
}
}
catch(Exception e){System.out.println("Coordinate in RIGHTBOTTOMSEARCH: "+row+" "+column);}
if(red>240 && green>240 && blue>240 && row-copyRow<=halfLimit && column-copyColumn<=halfLimit)
return 1;
return 0;
}
public static void startMakingABetterImage(){
CaptchaVerification captchaVerification = new CaptchaVerification();
BufferedImage bufferedImage=captchaVerification.takingTheImageInput();
captchaVerification.modifingTheBlackishLine(bufferedImage);
}
}