旅程一瞥

照片可以存储在既包含像素内容又含有元信息的文件中. 使用 Import, 就可以得到这样的元数据从而通过编程一探有关照片的背景.

导入并分析在里斯本参观期间拍摄的照片集.

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files = Map[img \[Function] ExampleData[img, "FilePath"], ExampleData[{"TestImageSet", "Lisbon2016"}]];

查看照片的日期直方图.

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dates = Map[file \[Function] Import[file, "DateTime"], files];

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DateHistogram[dates, Quantity[1, "Hours"]]

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查看缩略图拼贴画.

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thumbnails = ExampleData[{"TestImageSet", "Lisbon2016"}, "ThumbnailList"];

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ImageCollage[thumbnails, Method -> "Columns", ImagePadding -> 2]

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在时间轴上展示照片.

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TimelinePlot[MapThread[Labeled, {dates, thumbnails}], PlotLayout -> "Vertical", ImageSize -> Medium]

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收集一个数据集的所有信息.

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gps = Map[file \[Function] Import[file, "GeoPosition"], files];

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ds = Dataset[ MapThread[ AssociationThread[{"Thumbnail", "DateTime", "GeoPosition"} -> {##}] &, {thumbnails, dates, gps}]]

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显示照片的拍摄地点.

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GeoGraphics[ MapThread[ GeoMarker, {Normal[ds[All, "GeoPosition"]], Normal[ds[All, "Thumbnail"]]}], ImageSize -> Medium]

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