Can't access data using " .DateTime " string

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Laiba
Laiba 2024-11-10，8:13
评论： Star Strider 2024-11-10，21:20
hey, I'm taking image processsing ccourse from coursera by MATHWORKS. but there is a problem in accessing date and time of a picture in matlab using following given method in this course. please help in this query so that i can continue my course.
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Stephen23
Stephen23 2024-11-10，9:21
What fields does METADATA contain? How did you create METADATA?
Laiba
Laiba 2024-11-10，10:36
metadata is created as shown below..... following are the fields that metadata contains.

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Star Strider
Star Strider 2024-11-10，13:15
Ran in:
Perhaps this —
imshow(imread('peppers.png'))
metadata = imfinfo('peppers.png')
metadata = struct with fields:
Filename: '/MATLAB/toolbox/matlab/matlab_images/png/peppers.png' FileModDate: '13-Jul-2023 20:26:13' FileSize: 287677 Format: 'png' FormatVersion: [] Width: 512 Height: 384 BitDepth: 24 ColorType: 'truecolor' FormatSignature: [137 80 78 71 13 10 26 10] Colormap: [] Histogram: [] InterlaceType: 'none' Transparency: 'none' SimpleTransparencyData: [] BackgroundColor: [] RenderingIntent: [] Chromaticities: [] Gamma: [] XResolution: [] YResolution: [] ResolutionUnit: [] XOffset: [] YOffset: [] OffsetUnit: [] SignificantBits: [] ImageModTime: '16 Jul 2002 16:46:41 +0000' Title: [] Author: [] Description: 'Zesty peppers' Copyright: 'Copyright The MathWorks, Inc.' CreationTime: [] Software: [] Disclaimer: [] Warning: [] Source: [] Comment: [] OtherText: [] AutoOrientedWidth: 512 AutoOrientedHeight: 384
DateTime = datetime(metadata.FileModDate)
DateTime = datetime
13-Jul-2023 20:26:13
.
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Walter Roberson
Walter Roberson 2024-11-10，20:33
编辑：Walter Roberson 2024-11-10，21:02
According to the documentation for imfinfo()
  • DNG, JPEG, and TIFF only — If filename contains Exif tags, then info might include DigitalCamera or GPSInfo (global positioning system information) fields.
So this applies only to .dng, .jpg, .jpeg, .tif, and .tiff files, and only if the file includes EXIF tags, and even then only if the EXIF tags happen to include DigitalCamera or GPSInfo . If any of these three conditions are not satisfied, the DigitalCamera field will simply not be present. It will not "be present but empty" in such cases: it will literally not be present in such cases.
I was not able to find any case that potentially included a DateTime field.

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