Question

您正在开发一个程序，它将打开一个图像，然后从中提取元数据如何使用python提取元数据？

由于

Answer 1

使用Pillow，它是仍处于活动开发状态的PIL的分支，并支持python3。在这里，我使用dict生成器将exif数据映射到dict

from PIL import Image, ExifTags
img = Image.open("/path/to/file.jpg")
exif = { ExifTags.TAGS[k]: v for k, v in img._getexif().items() if k in ExifTags.TAGS }

Answer 2

有两种方法可以从文件中获取数据。

1。使用Exif工具：

对于Windows和Mac：可在以下位置获得 ExifTool 对于linux：您可以使用apt实用程序在Ubuntu上安装ExifTool sudo apt install libimage-exiftool-perl

现在，您可以通过在终端中的任何地方键入exiftool来运行ExifTool。建议使用此方法来获取元数据，因为它提供了比其他任何方式更多的标签。它是一个命令行工具，要在Python中使用它，用户必须创建一个子进程并将该工具和图像文件路径作为参数传递。请参考以下代码片段以使用exif工具获取元数据。（

infoDict = {} #Creating the dict to get the metadata tags
exifToolPath = 'D:/ExifTool/exifTool.exe' #for Windows user have to specify the Exif tool exe path for metadata extraction. 
#For mac and linux user it is just 
 """exifToolPath = exiftool"""
imgPath = 'D:/Images/12.jpg'

''' use Exif tool to get the metadata '''
process = subprocess.Popen([exifToolPath,imgPath],stdout=subprocess.PIPE, stderr=subprocess.STDOUT,universal_newlines=True) 
''' get the tags in dict '''
for tag in process.stdout:
    line = tag.strip().split(':')
    infoDict[line[0].strip()] = line[-1].strip()

for k,v in infoDict.items():
    print(k,':', v)

下图的元数据结果：

完整标签列表在这里：

""" ExifTool Version Number : 11.63
File Name : imgMeta.jpg
Directory : /Projects/ImageMetaData/Images
File Size : 32 kB
File Modification Date/Time : 30
File Access Date/Time : 30
File Creation Date/Time : 30
File Permissions : rw-rw-rw-
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Exif Byte Order : Little-endian (Intel, II)
Make : Canon
Camera Model Name : Canon PowerShot S40
Orientation : Horizontal (normal)
X Resolution : 180
Y Resolution : 180
Resolution Unit : inches
Modify Date : 44
Y Cb Cr Positioning : Centered
Exposure Time : 1/500
F Number : 4.9
Exif Version : 0220
Date/Time Original : 44
Create Date : 44
Components Configuration : Y, Cb, Cr, -
Compressed Bits Per Pixel : 5
Shutter Speed Value : 1/501
Aperture Value : 5.0
Max Aperture Value : 2.8
Flash : Auto, Did not fire
Focal Length : 103.7 mm)
Macro Mode : Normal
Self Timer : Off
Quality : Superfine
Canon Flash Mode : Auto
Continuous Drive : Single
Focus Mode : Single
Record Mode : JPEG
Canon Image Size : Large
Easy Mode : Manual
Digital Zoom : None
Contrast : Normal
Saturation : Normal
Sharpness : 0
Camera ISO : 100
Metering Mode : Center-weighted average
Focus Range : Auto
AF Point : Center
Canon Exposure Mode : Program AE
Lens Type : n/a
Max Focal Length : 21.3125 mm
Min Focal Length : 7.09375 mm
Focal Units : 32/mm
Max Aperture : 5
Min Aperture : 8
Flash Activity : 0
Flash Bits : (none)
Focus Continuous : Single
AE Setting : Normal AE
Display Aperture : 4.9
Zoom Source Width : 2272
Zoom Target Width : 2272
Spot Metering Mode : AF Point
Focal Type : Zoom
Focal Plane X Size : 7.26 mm
Focal Plane Y Size : 5.46 mm
Auto ISO : 100
Base ISO : 100
Measured EV : 13.63
Target Aperture : 5
Target Exposure Time : 1/501
Exposure Compensation : 0
White Balance : Auto
Slow Shutter : Off
Shot Number In Continuous Burst : 0
Optical Zoom Code : 6
Flash Guide Number : 0
AF Points In Focus : Center
Flash Exposure Compensation : 0
Auto Exposure Bracketing : Off
AEB Bracket Value : 0
Control Mode : Camera Local Control
Focus Distance Upper : 7.82 m
Focus Distance Lower : 0 m
Bulb Duration : 0
Camera Type : Compact
Canon Image Type : PowerShot S40 JPEG
Canon Firmware Version : Firmware Version 1.10
File Number : 117-1771
Owner Name : Andreas Huggel
Canon Model ID : PowerShot S40
User Comment : 
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 2272
Exif Image Height : 1704
Interoperability Index : R98 - DCF basic file (sRGB)
Interoperability Version : 0100
Related Image Width : 2272
Related Image Height : 1704
Focal Plane X Resolution : 8114.285714
Focal Plane Y Resolution : 8114.285714
Focal Plane Resolution Unit : inches
Sensing Method : One-chip color area
File Source : Digital Camera
Custom Rendered : Normal
Exposure Mode : Auto
Digital Zoom Ratio : 1
Scene Capture Type : Standard
Compression : JPEG (old-style)
Thumbnail Offset : 2066
Thumbnail Length : 5448
Image Width : 480
Image Height : 360
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : 0 (2 2)
Drive Mode : Single-frame Shooting
ISO : 100
Lens : 34.5 - 103.7 mm)
Shooting Mode : Program AE
Aperture : 4.9
Image Size : 480x360
Lens ID : Unknown 7-21mm
Megapixels : 0.173
Scale Factor To 35 mm Equivalent : 4.9
Shutter Speed : 1/500
Thumbnail Image : (Binary data 5448 bytes, use -b option to extract)
Circle Of Confusion : 0.006 mm
Depth Of Field : 2.17 m (3.11 - 5.28 m)
Field Of View : 19.7 deg
Hyperfocal Distance : 15.02 m
Light Value : 13.6 """

2。使用PIL包：

请参考以上任何一种方法。但是该方法的缺点是它仅适用于图像，而不能提供所有图像的元数据信息。

3。使用hachoir软件包： 与exif工具类似，它也是一个命令行工具，除了它是一个python包
用户可以使用pip install hachoir安装它。它可以提供大多数文件格式的元数据，但提供的信息少于Exif工具。

imgPath = 'D:/Images/12.jpg'
exeProcess = "hachoir-metadata"
process = subprocess.Popen([exeProcess,imgPath],
                                           stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                                           universal_newlines=True)

for tag in process.stdout:
        line = tag.strip().split(':')
        infoDict[line[0].strip()] = line[-1].strip()

for k,v in infoDict.items():
    print(k,':', v)

"""for same image : only 31 tags are identified by hachoir Method however Exif method is giving 131 tags """

hachoir提取的完整标签列表如下：

""" Metadata : 
Image width : 480 pixels
Image height : 360 pixels
Image orientation : Horizontal (normal)
Bits/pixel : 24
Pixel format : YCbCr
Image DPI width : 72 DPI
Image DPI height : 72 DPI
Creation date : 44
Camera aperture : 2.97
Camera focal : 4.9
Camera exposure : 1/500
Camera model : Canon PowerShot S40
Camera manufacturer : Canon
Compression : JPEG (Baseline)
Thumbnail size : 5448 bytes
EXIF version : 0220
Date-time original : 44
Date-time digitized : 44
Compressed bits per pixel : 5
Shutter speed : 8.97
Aperture : 4.66
Exposure bias : 0
Focal length : 21.3
Flashpix version : 0100
Focal plane width : 8.11e+03
Focal plane height : 8.11e+03
Comment : 75%
Format version : JFIF 1.01
MIME type : image/jpeg
Endianness : Big endian
"""

Answer 3

您可以使用以下python代码。

#!/bin/python
import os
import sys
from PIL import Image
from PIL.ExifTags import TAGS

image = sys.argv[1]

for (tag,value) in Image.open(image)._getexif().iteritems():
        print '%s = %s' % (TAGS.get(tag), value)

以下是示例输出。

Answer 4

import os,sys
from PIL import Image
from PIL.ExifTags import TAGS

for (tag,value) in Image.open(sys.argv[1])._getexif().iteritems():
        print ('%s = %s' % (TAGS.get(tag), value))

打印（'％s =％s'％（TAGS.get（标签），值））

如何使用python从图像中提取元数据？

4 个答案: