如何在Matlab中将元数据附加到图像？ [英] How do I append metadata to an image in Matlab?

问题描述

在Matlab中编写一些图像处理程序时，我发现我不知道如何将元数据写入新处理和保存的图像中。为了简单起见，我的流程如下：

In writing some image processing routines in Matlab, I found that I don't know how to write metadata in to a newly processed and saved image. To keep it simple, my flow is as follows:

image = imread('Base_Pic.jpg');  
image_info = imfinfo('Base_Pic.jpg');
%Process image...
%Update metadata...
imwrite(image,'Updated_Image.jpg','JPEG','Quality',100);

我基本上希望新处理的图像具有与原始图像相同的所有元数据属性，当然很少有字段更新。

I basically want the newly processed image to have all the same metadata attributes as the original image, with a few fields updated of course.

如何将 image_info 结构附加到新保存的 JPEG ？

How can I append the image_info structure to the newly saved JPEG?

推荐答案

你有一个（非常）有限的能力在 imwrite中执行此操作：对于JPEG，它只接受 BitDepth ，评论，模式和质量。并且模式和质量不会从 iminfo 返回。
在 imwrite 中你可以这样做：

You have a (very) limited ability to do this in imwrite : for JPEG it only accepts BitDepth, Comment, Mode and Quality. And Mode and Quality don't get returned from iminfo. In imwrite you can do:

iminfo = imfinfo('Base_Pic.jpg')
imwrite(...,'BitDepth',iminfo.BitDepth, 'Comment',iminfo.Comment);

除此之外，到目前为止还没有办法用Image Processing Toolbox / Matlab做到这一点我所知。如果您有TIFF或医学图像，有许多工具箱可以做到这一点，但我还没有找到任何jpeg，即使在文件交换...

Other than that, there isn't a way to do this with Image Processing Toolbox/Matlab as far as I know. If you have TIFF or medical images there are a number of toolboxes that do it, but I haven't ever found any for jpeg, even on the File Exchange...

如果您的系统上有 exiftool ，则可以使用

If you have exiftool on your system, you can use

[status info]=system('exiftool -s Base_Pic.jpg');

info 现在包含标签名称列表和标记值，例如：

info now contains a list of tag names and tag values, e.g.:

ExifToolVersion                 : 8.75
FileName                        : Base_Pic.jpg
Directory                       : Pictures
FileSize                        : 2.0 MB
FileModifyDate                  : 2011:10:27 08:41:55+10:00
FilePermissions                 : rw-rw-r--
FileType                        : JPEG
MIMEType                        : image/jpeg
JFIFVersion                     : 1.01
ExifByteOrder                   : Big-endian (Motorola, MM)
Make                            : Apple
Model                           : iPhone 4
...

如果你拆分冒号：你可以使用 exiftool - [TAG] = [VALUE] 将它们写回来，例如 exiftool -Make = Apple -Model =iPhone 4... 。

And if you split on colon : you can write them back using exiftool -[TAG]=[VALUE], e.g. exiftool -Make=Apple -Model="iPhone 4" ....

或者你可以复制它们所有在一次犯规中：

Or you can copy them "all" in one foul hit:

system('exiftool -overwrite_original -tagsFromFile Base_Pic.jpg Updated_Image.jpg')

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