Question

我已将Picasa的面部数据保存在JPEG文件中（在XMP中），现在我正在尝试用Java读取该信息。到目前为止，我失败了，非常感谢帮助。

我正在尝试使用metadata-extractor库（尽管任何其他解决方案也可以）。我可以阅读基本信息（如日期，图像大小等），但我在提取附加数据时迷失了方向。这是我到目前为止所得到的：

File file -- this is my JPEG file

Metadata metadata = JpegMetadataReader.readMetadata(file);
XmpDirectory xmpDirectory = metadata.getDirectory(XmpDirectory.class); 
XMPMeta xmpMeta = xmpDirectory.getXMPMeta();
System.out.println(xmpMeta.dumpObject());

结果：

ROOT NODE
    http://www.metadataworkinggroup.com/schemas/regions/ = "mwg-rs:" (0x80000000 : SCHEMA_NODE)
        mwg-rs:Regions  (0x100 : STRUCT)
            mwg-rs:AppliedToDimensions  (0x100 : STRUCT)
                stDim:h = "2793"
                stDim:unit = "pixel"
                stDim:w = "2047"
            mwg-rs:RegionList   (0x200 : ARRAY)
                [1] (0x100 : STRUCT)
                    mwg-rs:Area (0x100 : STRUCT)
                        stArea:h = "0.69531"
                        stArea:unit = "normalized"
                        stArea:w = "0.790425"
                        stArea:x = "0.491451"
                        stArea:y = "0.41783"
                    mwg-rs:Name = "abcde"
                    mwg-rs:Type = "Face"
    http://ns.adobe.com/xap/1.0/ = "xmp:"   (0x80000000 : SCHEMA_NODE)
        xmp:ModifyDate = "2014-04-06T19:43:24+01:00"

我不明白如何到达这些stArea：w，mwg-rs：Type =“Face”等。

Answer 1

像往常一样，在张贴我found a solution之后。我将在下面列出它以便在此处。

try {
    Metadata metadata = ImageMetadataReader.readMetadata(imageFile);
    XmpDirectory xmpDirectory = metadata.getDirectory(XmpDirectory.class);
    XMPMeta xmpMeta = xmpDirectory.getXMPMeta();
    XMPIterator itr = xmpMeta.iterator();
    while (itr.hasNext()) {
        XMPPropertyInfo pi = (XMPPropertyInfo) itr.next();
        if (pi != null && pi.getPath() != null) {
            if ((pi.getPath().endsWith("stArea:w")) || (pi.getPath().endsWith("mwg-rs:Name")) || (pi.getPath().endsWith("stArea:h")))
                System.out.println(pi.getValue().toString());
        }
    }
} catch (final NullPointerException npe) {
  // ignore
}

我不喜欢的是它遍历所有属性而不是只读取所需的属性。任何更好（更快）的解决方案？

如何从Java中读取JPEG中的XMP面数据

1 个答案: