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xupei
2024-10-08 13:34:10 +08:00
parent 1bdc71998b
commit a7c5723e10
261 changed files with 771 additions and 774 deletions
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src/test/java/com/ai/da/controller/PgmIo.java Normal file
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package com.ai.da.controller;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import java.util.List;
/**
* A utility class for reading and writing PGM images. Methods use integers to represent unsigned bytes.
* <p>
* Does not fully conform to the PGM specification because currently there is no support for:
* <ul>
* <li>More than one image per file</li>
* <li>Images with more than 256 shades of gray</li>
* <li>Comments within the raster</li>
* </ul>
* github https://gist.github.com/armanbilge/3276d80030d1caa2ed7c#file-pgmio-java-L2
*
* @author Arman Bilge
*/
public final class PgmIo {
private static final String MAGIC = "P5";
/**
* Character indicating a comment.
*/
private static final char COMMENT = '#';
/**
* The maximum gray value.
*/
private static final int MAXVAL = 255;
/**
* Reads a grayscale image from a file in PGM format.
*
* @param file the PGM file read from
* @return two-dimensional byte array representation of the image
* @throws IOException
*/
public static int[][] read(final File file) throws IOException {
final BufferedInputStream stream = new BufferedInputStream(new FileInputStream(file));
try {
if (!next(stream).equals(MAGIC))
throw new IOException("File " + file + " is not a binary PGM image.");
final int col = Integer.parseInt(next(stream));
final int row = Integer.parseInt(next(stream));
final int max = Integer.parseInt(next(stream));
if (max < 0 || max > MAXVAL)
throw new IOException("The image's maximum gray value must be in range [0, " + MAXVAL + "].");
final int[][] image = new int[row][col];
for (int i = 0; i < row; ++i) {
for (int j = 0; j < col; ++j) {
final int p = stream.read();
if (p == -1)
throw new IOException("Reached end-of-file prematurely.");
else if (p < 0 || p > max)
throw new IOException("Pixel value " + p + " outside of range [0, " + max + "].");
image[i][j] = p;
}
}
return image;
} finally {
stream.close();
}
}
/**
* Finds the next whitespace-delimited string in a stream, ignoring any comments.
*
* @param stream the stream read from
* @return the next whitespace-delimited string
* @throws IOException
*/
private static String next(final InputStream stream) throws IOException {
final List<Byte> bytes = new ArrayList<Byte>();
while (true) {
final int b = stream.read();
if (b != -1) {
final char c = (char) b;
if (c == COMMENT) {
int d;
do {
d = stream.read();
} while (d != -1 && d != '\n' && d != '\r');
} else if (!Character.isWhitespace(c)) {
bytes.add((byte) b);
} else if (bytes.size() > 0) {
break;
}
} else {
break;
}
}
final byte[] bytesArray = new byte[bytes.size()];
for (int i = 0; i < bytesArray.length; ++i)
bytesArray[i] = bytes.get(i);
return new String(bytesArray);
}
/**
* Writes a grayscale image to a file in PGM format.
*
* @param image a two-dimensional byte array representation of the image
* @param file the file to write to
* @throws IllegalArgumentException
* @throws IOException
*/
public static void write(final int[][] image, final File file) throws IOException {
write(image, file, MAXVAL);
}
public static void write(BufferedImage image, final File file) throws IOException {
int[][] rgbArray = new int[image.getHeight()][image.getWidth()];
for (int j = 0; j < image.getHeight(); j++) {
for (int i = 0; i < image.getWidth(); i++) {
int p = image.getRGB(i, j);
int a = (p >> 24) & 0xff;
int r = (p >> 16) & 0xff;
int g = (p >> 8) & 0xff;
int b = p & 0xff;
int avg = (r + g + b) / 3;
p = (a << 24) | (avg << 16) | (avg << 8) | avg;
//newImg.setRGB(i, j, p);
//image.setRGB(i, j, p);
rgbArray[j][i] = avg;
}
}
write(rgbArray, file);
}
public static void write(File imageFile, final File file) throws IOException {
try {
BufferedImage bf = ImageIO.read(imageFile);
write(bf, file);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Writes a grayscale image to a file in PGM format.
*
* @param image a two-dimensional byte array representation of the image
* @param file the file to write to
* @param maxval the maximum gray value
* @throws IllegalArgumentException
* @throws IOException
*/
public static void write(final int[][] image, final File file, final int maxval) throws IOException {
if (maxval > MAXVAL)
throw new IllegalArgumentException("The maximum gray value cannot exceed " + MAXVAL + ".");
final BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(file));
try {
stream.write(MAGIC.getBytes());
stream.write("\n".getBytes());
stream.write(Integer.toString(image[0].length).getBytes());
stream.write(" ".getBytes());
stream.write(Integer.toString(image.length).getBytes());
stream.write("\n".getBytes());
stream.write(Integer.toString(maxval).getBytes());
stream.write("\n".getBytes());
for (int i = 0; i < image.length; i++) {
for (int j = 0; j < image[0].length; j++) {
final int p = image[i][j];
if (p < 0 || p > maxval)
throw new IOException("Pixel value " + p + " outside of range [0, " + maxval + "].");
stream.write(image[i][j]);
}
}
//you can delete println
System.out.println("PGM create successful, file name :" + file.getName() + "\nwidth:" + image[0].length + ",height:" + image.length);
} finally {
stream.close();
}
}
}