代码1
/*
Java code for making the image grayscale, then binarizing it.
*/
import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.lang.Object;
import java.lang.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.util.ArrayList;
import java.util.List;
public class lineremoval {
private static BufferedImage binarizedImage;
public static void main(String[] args) throws IOException {
File orignal_name = new File("photot.png");
binarizedImage = ImageIO.read(orignal_name);
ExtractBeltsBasedonCoveredHeight();
BufferedImage bmp = new BufferedImage(binarizedImage.getWidth(), binarizedImage.getHeight(),binarizedImage.getType());
for(int i=0; i<binarizedImage.getWidth(); i++) {
for(int j=0; j<binarizedImage.getHeight(); j++) {
int red;
red = new Color(binarizedImage.getRGB(i,j)).getRed();
int alpha = new Color(binarizedImage.getRGB(i,j)).getAlpha();
int newPixel;
newPixel = colorToRGB(alpha, red,red,red);
bmp.setRGB(i, j, newPixel);
}
}
writeImage(bmp,0);
}
public static int FindBottomOfLine(BufferedImage bitmap, int topOfLine)
{
int x=0;
boolean no_black_pixel;
no_black_pixel = false;
int to_match;
while (no_black_pixel == false)
{
topOfLine++;
int white=new Color(bitmap.getRGB(0,0)).getRed();
no_black_pixel = true;
for (x = 0; x < bitmap.getWidth() && topOfLine < bitmap.getHeight(); x++)
{
to_match = new Color(bitmap.getRGB(x,topOfLine)).getRed();
if (to_match!=white)
no_black_pixel = false;
}
}
return topOfLine - 1;
}
public static int ExtractBeltsBasedonCoveredHeight()
{
int y = 0;
int x = 0;
boolean line_present = true;
ArrayList<Integer> line_top = new ArrayList<Integer>(1000);
ArrayList<Integer> line_bottom = new ArrayList<Integer>(1000);
while (line_present)
{
x = 0;
y = FindNextLine(binarizedImage, y, x);
if (y == -1)
break;
if (y >= binarizedImage.getHeight())
{
line_present = false;
}
if (line_present)
{
line_top.add(y);
y = FindBottomOfLine(binarizedImage, y) + 1;
line_bottom.add(y);
}
}
return 1;
}
private static void writeImage(BufferedImage bmp,int number) throws IOException {
String strI = Integer.toString(number);
File file = new File("output"+strI+".png");
try {
ImageIO.write(bmp, "png", file);
}catch(IOException e) {
System.out.println("Not worked");
}
finally {
System.out.println("Works fine");
}
}
private static int colorToRGB(int alpha, int red, int green, int blue) {
int newPixel = 0;
newPixel += alpha;
newPixel = newPixel << 8;
newPixel += red; newPixel = newPixel << 8;
newPixel += green; newPixel = newPixel << 8;
newPixel += blue;
return newPixel;
}
public static int FindNextLine(BufferedImage bitmap, int y,int x)
{
if (y >= bitmap.getHeight())
return -1;
int white=new Color(bitmap.getRGB(0,0)).getRed();
int to_match = new Color(bitmap.getRGB(x,y)).getRed();
while (to_match==white)
{
x++;
if (x == bitmap.getWidth())
{
x = 0;
y++;
}
if (y >= bitmap.getHeight())
{
break;
}
to_match = new Color(bitmap.getRGB(x,y)).getRed();
}
return y < bitmap.getHeight() ? y : -1;
}
}
代码2
import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.lang.Object;
import java.lang.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.util.ArrayList;
import java.util.List;
public class lineremoval {
private static BufferedImage binarizedImage;
public static void main(String[] args) throws IOException {
File orignal_name = new File("photot.png");
binarizedImage = ImageIO.read(orignal_name);
ExtractBeltsBasedonCoveredHeight();
}
public static int FindBottomOfLine(BufferedImage bitmap, int topOfLine)
{
int x=0;
boolean no_black_pixel;
no_black_pixel = false;
int to_match;
while (no_black_pixel == false)
{
topOfLine++;
int white=new Color(bitmap.getRGB(0,0)).getRed();
no_black_pixel = true;
for (x = 0; x < bitmap.getWidth() && topOfLine < bitmap.getHeight(); x++)
{
to_match = new Color(bitmap.getRGB(x,topOfLine)).getRed();
if (to_match!=white)
no_black_pixel = false;
}
}
return topOfLine - 1;
}
public static int ExtractBeltsBasedonCoveredHeight()
{
int y = 0;
int x = 0;
boolean line_present = true;
ArrayList<Integer> line_top = new ArrayList<Integer>(1000);
ArrayList<Integer> line_bottom = new ArrayList<Integer>(1000);
while (line_present)
{
x = 0;
y = FindNextLine(binarizedImage, y, x);
if (y == -1)
break;
if (y >= binarizedImage.getHeight())
{
line_present = false;
}
if (line_present)
{
line_top.add(y);
y = FindBottomOfLine(binarizedImage, y) + 1;
line_bottom.add(y);
}
}
BufferedImage bmp = new BufferedImage(binarizedImage.getWidth(), binarizedImage.getHeight(),binarizedImage.getType());
for(int i=0; i<binarizedImage.getWidth(); i++) {
for(int j=0; j<binarizedImage.getHeight(); j++) {
int red;
red = new Color(binarizedImage.getRGB(i,j)).getRed();
int alpha = new Color(binarizedImage.getRGB(i,j)).getAlpha();
int newPixel;
newPixel = colorToRGB(alpha, red,red,red);
bmp.setRGB(i, j, newPixel);
}
}
writeImage(bmp,0);
return 1;
}
private static void writeImage(BufferedImage bmp,int number) throws IOException {
String strI = Integer.toString(number);
File file = new File("output"+strI+".png");
try {
ImageIO.write(bmp, "png", file);
}catch(IOException e) {
System.out.println("Not worked");
}
finally {
System.out.println("Works fine");
}
}
private static int colorToRGB(int alpha, int red, int green, int blue) {
int newPixel = 0;
newPixel += alpha;
newPixel = newPixel << 8;
newPixel += red; newPixel = newPixel << 8;
newPixel += green; newPixel = newPixel << 8;
newPixel += blue;
return newPixel;
}
public static int FindNextLine(BufferedImage bitmap, int y,int x)
{
if (y >= bitmap.getHeight())
return -1;
int white=new Color(bitmap.getRGB(0,0)).getRed();
int to_match = new Color(bitmap.getRGB(x,y)).getRed();
while (to_match==white)
{
x++;
if (x == bitmap.getWidth())
{
x = 0;
y++;
}
if (y >= bitmap.getHeight())
{
break;
}
to_match = new Color(bitmap.getRGB(x,y)).getRed();
}
return y < bitmap.getHeight() ? y : -1;
}
}
我想从位图获取x图像包含x行段落的图像。 每个Image应包含段落中的一行。为此，我使用函数（“ExtractBeltsBasedonCoveredHeight”）来获取两个列表。在这些列表中，ith元素表示段落中第i行的起始行no和end row no（在列表list_top和list_bottom中）。
获取这些值后，我无法从ExtractBeltsBasedonCoveredHeight函数创建图像。
我的code1创建了Images但是code2给出了错误两个代码是相同的唯一的区别在于code2我从函数“ExtractBeltsBasedonCoveredHeight”调用了writeImage，在code1中我从main函数调用了writeImage
错误消息
lineremoval.java:86: error: unreported exception IOException; must be caught or declared to be thrown
writeImage(bmp,0);
^
1 error
答案 0 :(得分：1)
该消息（像往常一样）告诉您究竟出了什么问题以及如何解决它。您正在调用可能会调用IOException的代码，当您执行此操作时，必须抛出异常或在try / catch块中捕获它。最好的办法是查看例外教程，了解如何做到这两点。