java - 将 DICOM 转换为 JPEG 时出错

Question

我正在编写将 DICOM Iamge (.dcm) 转换为 JPEG 格式的代码 - 这是我使用的代码，它给了我一个:javax.imageio.spi.ImageReaderSpi:Provider com.sun.media.imageioimpl.plugins.pcx.PCXImageReaderSpi 未找到错误...

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;

import org.dcm4che.imageio.plugins.DcmImageReadParam;
import org.dcm4che.util.BufferedOutputStream;
import org.dcm4che2.imageio.plugins.dcm.DicomImageReadParam;
public class DicomToJpeg
{
    public static void main(String[] args)
    {
        //our DICOM file
        File my`enter code here`DicomFile = new File("IM-0001-0001.dcm");

    //declaring our JPEG image
    BufferedImage myJpegImage = null;

    //iterator containing all registered ImageReades that claim to decome the name format
    Iterator<ImageReader> iter= ImageIO.getImageReadersByFormatName("DICOM");

    //geting our ImageReader object
    ImageReader reader = (ImageReader) iter.next();

    //getting the parameters to read the DICOM image 
    DicomImageReadParam param = (DicomImageReadParam)reader.getDefaultReadParam();

    try
    {
        ImageInputStream iis = ImageIO.createImageInputStream(myDicomFile);
        reader.setInput(iis,false);
        myJpegImage = reader.read(0,param);
        iis.close();

        if(myJpegImage==null)
        {
            System.out.println("\nError: Couldn't read teh dicom image!");
            return;
        }

        File myJpegFile = new File("OutputJpegImage.jpg");
        OutputStream output = new BufferedOutputStream( new FileOutputStream(myJpegFile));
        ImageIO.write(myJpegImage, "jpeg", output);
        output.close();
    }
    catch (IOException e) 
    {
           System.out.println("\nError: couldn't read dicom image!"+ e.getMessage());
           return;
    }
}

}

这是我收到的错误？知道我错过了什么

Exception in thread "main" java.util.ServiceConfigurationError: javax.imageio.spi.ImageReaderSpi:   Provider com.sun.media.imageioimpl.plugins.pcx.PCXImageReaderSpi not found
    at java.util.ServiceLoader.fail(Unknown Source)
    at java.util.ServiceLoader.access$300(Unknown Source)
    at java.util.ServiceLoader$LazyIterator.next(Unknown Source)
    at java.util.ServiceLoader$1.next(Unknown Source)
    at javax.imageio.spi.IIORegistry.registerApplicationClasspathSpis(Unknown Source)
    at javax.imageio.spi.IIORegistry.<init>(Unknown Source)
    at javax.imageio.spi.IIORegistry.getDefaultInstance(Unknown Source)
    at javax.imageio.ImageIO.<clinit>(Unknown Source)
    at dcm4chee.DicomToJpeg.main(DicomToJpeg.java:29)

Answer 1

在类路径的某个地方，有一个条目(JAR 中的文件或资源)，名为:

/META-INF/services/javax.imageio.spi.ImageReaderSpi

...包含(至少)行:

com.sun.media.imageioimpl.plugins.pcx.PCXImageReaderSpi

每当初始化 ImageIO 或调用 ImageIO.scanForPlugins() 时，IIORegistry/ServiceLoader 都会扫描类路径查找与上述名称匹配的资源。对于此文件/资源​​中的每一行，它将尝试使用给定名称(通常是服务提供者)实例化该类。如果找不到该类，或者无法实例化该类(访问保护、缺少构造函数等)，它将失败并出现 ServiceConfigurationError。

例如参见 this link了解更多信息。

要修复此问题，您需要删除包含该资源的文件或 JAR(或从 JAR 中对其进行编辑)，或者删除包含不良服务提供者的行。或者，将服务提供者添加到您的类路径中(我认为它通常位于名为 jai_imageio.jar 的 JAR 中)。但我认为您不需要 PCX(ZSoft Paintbrush 格式)支持来解码 DICOM。