我已将 Picasa 的面部数据保存在我的 JPEG 文件中(在 XMP 中),现在我正尝试用 Java 读取该信息。到目前为止,我失败了,我们将不胜感激。
我正在尝试使用元数据提取器库(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。