我已经将Picasa的面部数据保存在JPEG文件中(在XMP中),现在我试图用Java读取该信息.到目前为止,我失败了,将不胜感激.

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(例如日期,图像尺寸等),但是我在提取其他数据时迷失了方向.这是到目前为止我得到的：

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.

解决方法:

像往常一样,在发布后立即有found a solution.我将在下面列出以将其放在此处.

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

}

我在这里不喜欢的是,它遍历所有属性,而不仅仅是读取必需的属性.有更好(更快)的解决方案吗？

标签：picasa,xmp,metadata-extractor,java

来源： https://codeday.me/bug/20191121/2054131.html