我需要读取一个非常大的图像文件(56000 px X 49000 px)。我需要以小的矩形块读取它,所以我试图遵循这个例子:Read region from very large image file in Java
但是,我收到此错误:java.lang.IllegalArgumentException: width*height > Integer.MAX_VALUE!
我的代码片段如下(或多或少完全来自上面的链接):
ImageInputStream stream = null;
try {
stream = ImageIO.createImageInputStream(new File(this.inFile)); // File or input stream
} catch (Exception ex) {
Logger.getLogger(CreateTrainingSetFromImage.class.getName()).log(Level.SEVERE, null, ex);
}
Iterator<ImageReader> readers = ImageIO.getImageReaders(stream);
ImageReader r = readers.next();
System.out.println("Using reader: " + r);
r.setInput(stream);
try {
System.out.println("Height = " + r.getHeight(0));
System.out.println("Width = " + r.getWidth(0));
} catch (IOException ex) {
Logger.getLogger(CreateTrainingSetFromImage.class.getName()).log(Level.SEVERE, null, ex);
}
ImageReadParam param = r.getDefaultReadParam();
Rectangle sourceRegion = new Rectangle(0, 0, 200, 200);
param.setSourceRegion(sourceRegion); // Set region
BufferedImage image = null;
try {
image = r.read(0, param); // Will read only the region specified
System.out.println("Read file " + this.inFile);
System.out.println("Width = " + image.getWidth());
System.out.println("Height = " + image.getHeight());
} catch (Exception ex) {
Logger.getLogger(CreateTrainingSetFromImage.class.getName()).log(Level.SEVERE, null, ex);
}
我的理解是,为参数指定 Rectangle sourceRegion 会使 ImageReader 只读取图像的一小块,所以我不明白是什么导致了错误。任何帮助将非常感激。如果有帮助,我正在使用 TwelveMonkeys ImageIO 插件。
这是输出:
Using reader: com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader@5437dd04
Height = 49429
Width = 56281
Apr 23, 2017 11:57:17 AM createtrainingsetfromimage.CreateTrainingSetFromImage test
SEVERE: null
java.lang.IllegalArgumentException: width*height > Integer.MAX_VALUE!
at javax.imageio.ImageReader.getDestination(ImageReader.java:2840)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1066)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1034)
at com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:382)
at createtrainingsetfromimage.CreateTrainingSetFromImage.test(CreateTrainingSetFromImage.java:102)
at createtrainingsetfromimage.CreateTrainingSetFromImage.createTrainingSet(CreateTrainingSetFromImage.java:168)
at createtrainingsetfromimage.CreateTrainingSetFromImage.main(CreateTrainingSetFromImage.java:46)