dcm4che3实现 printSCU时 图像发生偏移

在实现pirntSCU时，需要将dicom图像转为灰度图像，使用以下代码进行转换时，预览的图像发生了偏移，使用类库dcm4che3,如何解决偏移问题，代码如下：

 public static byte[] convertToGreyImage(File imgFile) throws IOException {
        DicomInputStream dicomInputStream = new DicomInputStream(imgFile);
//        Attributes attrs = dicomInputStream.readDataset();
        ImageInputStream imageInputStream = ImageIO.createImageInputStream(dicomInputStream);

        // 获取DICOM图像读取器
        Iterator<ImageReader> imageReaders = ImageIO.getImageReadersByFormatName("DICOM");
        ImageReader imageReader = imageReaders.next();

        // DICOM图像读取参数
        DicomImageReadParam dicomReadParam = (DicomImageReadParam) imageReader.getDefaultReadParam();
        dicomReadParam.setWindowCenter(40); // DICOM窗位
        dicomReadParam.setWindowWidth(400); // DICOM窗宽

        //自动计算窗位窗宽
        dicomReadParam.setAutoWindowing(true);
//        dicomReadParam.setPresentationState(attrs);
        dicomReadParam.setDestinationType(ImageTypeSpecifier.createGrayscale(8, DataBuffer.TYPE_BYTE,false));


        // 设置图像读取器的输入流
        imageReader.setInput(imageInputStream, false);


        // 读取DICOM图像
        BufferedImage dicomImage = imageReader.read(0, dicomReadParam);

        //获取图像偏移信息
        int offsetX = dicomImage.getMinX();
        int offsetY = dicomImage.getMinY();


        // 将DICOM图像转换为灰度图像
        BufferedImage greyImage = new BufferedImage(dicomImage.getWidth(), dicomImage.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D graphics = greyImage.createGraphics();
        graphics.drawImage(dicomImage, -offsetX, -offsetY, null);
        graphics.dispose();

        // 获取TIFF ImageWriter
        ImageWriter writer = ImageIO.getImageWritersByFormatName("TIF").next();

        // 设置压缩参数（可选）
        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_DEFAULT);


//         将灰度图像转换为字节数组
        // 将图像写入 ByteArrayOutputStream
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
        writer.setOutput(ios);
        writer.write(null, new javax.imageio.IIOImage(greyImage, null, null), param);
        ios.close();
//        ImageIO.write(greyImage, "TIFF", outputStream);
        byte[] greyBytes = outputStream.toByteArray();


        // 关闭流
        dicomInputStream.close();
        imageInputStream.close();
        outputStream.close();

        return greyBytes;
    }

最终预览的效果如下：

【以下回答由 GPT 生成】

这个问题的原因是图像发生了偏移。发生偏移的原因是在绘制灰度图像时，没有正确处理图像的偏移信息。解决这个问题的方法是，在绘制灰度图像之前，先获取图像的偏移信息，并在绘制时进行相应的处理。

下面是修改后的代码，解决了图像偏移的问题：

public static byte[] convertToGreyImage(File imgFile) throws IOException {
    DicomInputStream dicomInputStream = new DicomInputStream(imgFile);
    ImageInputStream imageInputStream = ImageIO.createImageInputStream(dicomInputStream);

    // 获取DICOM图像读取器
    Iterator<ImageReader> imageReaders = ImageIO.getImageReadersByFormatName("DICOM");
    ImageReader imageReader = imageReaders.next();

    // DICOM图像读取参数
    DicomImageReadParam dicomReadParam = (DicomImageReadParam) imageReader.getDefaultReadParam();
    dicomReadParam.setWindowCenter(40); // DICOM窗位
    dicomReadParam.setWindowWidth(400); // DICOM窗宽
    dicomReadParam.setAutoWindowing(true); // 自动计算窗位窗宽

    // 设置图像读取器的输入流
    imageReader.setInput(imageInputStream, false);

    // 读取DICOM图像
    BufferedImage dicomImage = imageReader.read(0, dicomReadParam);

    // 获取图像偏移信息
    int offsetX = dicomImage.getMinX();
    int offsetY = dicomImage.getMinY();

    // 将DICOM图像转换为灰度图像
    BufferedImage greyImage = new BufferedImage(dicomImage.getWidth(), dicomImage.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
    Graphics2D graphics = greyImage.createGraphics();
    graphics.drawImage(dicomImage, -offsetX, -offsetY, null);
    graphics.dispose();

    // 获取灰度图像的字节数组
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(greyImage, "JPEG", baos);
    baos.flush();
    byte[] greyImageBytes = baos.toByteArray();
    baos.close();

    return greyImageBytes;
}

这个修改后的代码解决了图像偏移的问题。在绘制灰度图像时，根据图像的偏移信息，将图像进行正确的偏移以保证图像位置的准确性。