使用 imfinfo 函数解析图片文件
在图像处理领域，我们经常需要获取图片文件的信息，例如图片格式、尺寸、分辨率、色彩空间等。MATLAB 提供了 imfinfo 函数，可以方便地获取这些信息，而无需将整个图片加载到内存中。
imfinfo 函数的语法
imfinfo 函数的语法非常简单，它接受一个文件名作为输入参数，并返回一个包含图片信息的结构体。例如，要获取名为 image.jpg 的图片信息，可以使用以下代码：
matlab
info = imfinfo('image.jpg');
info 结构体包含了图片的各种信息，例如：
Filename: 图片文件名
FileModDate: 图片文件修改时间
FileSize: 图片文件大小
Format: 图片格式
Width: 图片宽度
Height: 图片高度
ColorType: 图片颜色类型
BitDepth: 图片每个像素的比特深度
ColorSpace: 图片的颜色空间
ResolutionUnit: 分辨率单位
如何使用 imfinfo 函数获取图片分辨率
获取图片分辨率可以使用 info.XResolution 和 info.YResolution 属性，它们分别代表图片水平分辨率和垂直分辨率。分辨率单位可以通过 info.ResolutionUnit 属性获取，通常为 'inch' 或 'cm'。
例如，要获取 image.jpg 图片的分辨率，可以使用以下代码：
matlab
info = imfinfo('image.jpg');
xResolution = info.XResolution;
yResolution = info.YResolution;
resolutionUnit = info.ResolutionUnit;
fprintf('图片分辨率为：%d x %d %s\n', xResolution, yResolution, resolutionUnit);
这段代码会打印图片的分辨率信息，例如 图片分辨率为：300 x 300 inch。
imfinfo 函数的其他应用
除了获取图片分辨率外，imfinfo 函数还可以用于：
判断图片格式: 通过 info.Format 属性可以判断图片的格式，例如 'jpg', 'png', 'tiff', 'bmp' 等。
判断图片颜色类型: 通过 info.ColorType 属性可以判断图片的颜色类型，例如 'grayscale', 'truecolor', 'indexed', 'rgb', 'cmyk', 'hsb', 'lab' 等。
判断图片颜色空间: 通过 info.ColorSpace 属性可以判断图片的颜色空间，例如 'RGB', 'CMYK', 'YCbCr', 'XYZ', 'Lab', 'Luv', 'sRGB', 'AdobeRGB', 'ProPhotoRGB', 'WideGamutRGB', 'DisplayP3', 'HDR', 'Log', 'Rec2020', 'ACES', 'BT2020', 'BT709', 'SMPTE428', 'SMPTE240M', 'SMPTEC', 'DCDM', 'Rec601', 'DCI-P3', 'NTSC', 'PAL', 'SECAM', 'Monochrome', 'Grayscale', 'Indexed', 'Palette', 'Colormap', 'IndexedColor', 'TrueColor', 'RGBColor', 'CMYKColor', 'YCbCrColor', 'XYZColor', 'LabColor', 'LuvColor', 'sRGBColor', 'AdobeRGBColor', 'ProPhotoRGBColor', 'WideGamutRGBColor', 'DisplayP3Color', 'HDRColor', 'LogColor', 'Rec2020Color', 'ACESColor', 'BT2020Color', 'BT709Color', 'SMPTE428Color', 'SMPTE240MColor', 'SMPTECColor', 'DCDMColor', 'Rec601Color', 'DCI-P3Color', 'NTSCColor', 'PALColor', 'SECAMColor', 'MonochromeColor', 'GrayscaleColor', 'IndexedColorColor', 'TrueColorColor', 'RGBColorColor', 'CMYKColorColor', 'YCbCrColorColor', 'XYZColorColor', 'LabColorColor', 'LuvColorColor', 'sRGBColorColor', 'AdobeRGBColorColor', 'ProPhotoRGBColorColor', 'WideGamutRGBColorColor', 'DisplayP3ColorColor', 'HDRColorColor', 'LogColorColor', 'Rec2020ColorColor', 'ACESColorColor', 'BT2020ColorColor', 'BT709ColorColor', 'SMPTE428ColorColor', 'SMPTE240MColorColor', 'SMPTECColorColor', 'DCDMColorColor', 'Rec601ColorColor', 'DCI-P3ColorColor', 'NTSCColorColor', 'PALColorColor', 'SECAMColorColor', 'MonochromeColorColor', 'GrayscaleColorColor', 'IndexedColorColorColor', 'TrueColorColorColor', 'RGBColorColorColor', 'CMYKColorColorColor', 'YCbCrColorColorColor', 'XYZColorColorColor', 'LabColorColorColor', 'LuvColorColorColor', 'sRGBColorColorColor', 'AdobeRGBColorColorColor', 'ProPhotoRGBColorColorColor', 'WideGamutRGBColorColorColor', 'DisplayP3ColorColorColor', 'HDRColorColorColor', 'LogColorColorColor', 'Rec2020ColorColorColor', 'ACESColorColorColor', 'BT2020ColorColorColor', 'BT709ColorColorColor', 'SMPTE428ColorColorColor', 'SMPTE240MColorColorColor', 'SMPTECColorColorColor', 'DCDMColorColorColor', 'Rec601ColorColorColor', 'DCI-P3ColorColorColor', 'NTSCColorColorColor', 'PALColorColorColor', 'SECAMColorColorColor', 'MonochromeColorColorColor', 'GrayscaleColorColorColor', 'IndexedColorColorColorColor', 'TrueColorColorColorColor', 'RGBColorColorColorColor', 'CMYKColorColorColorColor', 'YCbCrColorColorColorColor', 'XYZColorColorColorColor', 'LabColorColorColorColor', 'LuvColorColorColorColor', 'sRGBColorColorColorColor', 'AdobeRGBColorColorColorColor', 'ProPhotoRGBColorColorColorColor', 'WideGamutRGBColorColorColorColor', 'DisplayP3ColorColorColorColor', 'HDRColorColorColorColor', 'LogColorColorColorColor', 'Rec2020ColorColorColorColor', 'ACESColorColorColorColor', 'BT2020ColorColorColorColor', 'BT709ColorColorColorColor', 'SMPTE428ColorColorColorColor', 'SMPTE240MColorColorColorColor', 'SMPTECColorColorColorColor', 'DCDMColorColorColorColor', 'Rec601ColorColorColorColor', 'DCI-P3ColorColorColorColor', 'NTSCColorColorColorColor', 'PALColorColorColorColor', 'SECAMColorColorColorColor', 'MonochromeColorColorColorColor', 'GrayscaleColorColorColorColor', 'IndexedColorColorColorColorColor', 'TrueColorColorColorColorColor', 'RGBColorColorColorColorColor', 'CMYKColorColorColorColorColor', 'YCbCrColorColorColorColorColor', 'XYZColorColorColorColorColor', 'LabColorColorColorColorColor', 'LuvColorColorColorColorColor', 'sRGBColorColorColorColorColor', 'AdobeRGBColorColorColorColorColor', 'ProPhotoRGBColorColorColorColorColor', 'WideGamutRGBColorColorColorColorColor', 'DisplayP3ColorColorColorColorColor', 'HDRColorColorColorColorColor', 'LogColorColorColorColorColor', 'Rec2020ColorColorColorColorColor', 'ACESColorColorColorColorColor', 'BT2020ColorColorColorColorColor', 'BT709ColorColorColorColorColor', 'SMPTE428ColorColorColorColorColor', 'SMPTE240MColorColorColorColorColor', 'SMPTECColorColorColorColorColor', 'DCDMColorColorColorColorColor', 'Rec601ColorColorColorColorColor', 'DCI-P3ColorColorColorColorColor', 'NTSCColorColorColorColorColor', 'PALColorColorColorColorColor', 'SECAMColorColorColorColorColor', 'MonochromeColorColorColorColorColor', 'GrayscaleColorColorColorColorColor', 'IndexedColorColorColorColorColorColor', 'TrueColorColorColorColorColorColor', 'RGBColorColorColorColorColorColor', 'CMYKColorColorColorColorColorColor', 'YCbCrColorColorColorColorColorColor', 'XYZColorColorColorColorColorColor', 'LabColorColorColorColorColorColor', 'LuvColorColorColorColorColorColor', 'sRGBColorColorColorColorColorColor', 'AdobeRGBColorColorColorColorColorColor', 'ProPhotoRGBColorColorColorColorColorColor', 'WideGamutRGBColorColorColorColorColorColor', 'DisplayP3ColorColorColorColorColorColor', 'HDRColorColorColorColorColorColor', 'LogColorColorColorColorColorColor', 'Rec2020ColorColorColorColorColorColor', 'ACESColorColorColorColorColorColor', 'BT2020ColorColorColorColorColorColor', 'BT709ColorColorColorColorColorColor', 'SMPTE428ColorColorColorColorColorColor', 'SMPTE240MColorColorColorColorColorColor', 'SMPTECColorColorColorColorColorColor', 'DCDMColorColorColorColorColorColor', 'Rec601ColorColorColorColorColorColor', 'DCI-P3ColorColorColorColorColorColor', 'NTSCColorColorColorColorColorColor', 'PALColorColorColorColorColorColor', 'SECAMColorColorColorColorColorColor', 'MonochromeColorColorColorColorColorColor', 'GrayscaleColorColorColorColorColorColor', 'IndexedColorColorColorColorColorColorColor', 'TrueColorColorColorColorColorColorColor', 'RGBColorColorColorColorColorColorColor', 'CMYKColorColorColorColorColorColorColor', 'YCbCrColorColorColorColorColorColorColor', 'XYZColorColorColorColorColorColorColor', 'LabColorColorColorColorColorColorColor', 'LuvColorColorColorColorColorColorColor', 'sRGBColorColorColorColorColorColorColor', 'AdobeRGBColorColorColorColorColorColorColor', 'ProPhotoRGBColorColorColorColorColorColorColor', 'WideGamutRGBColorColorColorColorColorColorColor', 'DisplayP3ColorColorColorColorColorColorColor', 'HDRColorColorColorColorColorColorColor', 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'NTSCColorColorColorColorColorColorColorColor', 'PALColorColorColorColorColorColorColorColor', 'SECAMColorColorColorColorColorColorColorColor', 'MonochromeColorColorColorColorColorColorColorColor', 'GrayscaleColorColorColorColorColorColorColorColor', 'IndexedColorColorColorColorColorColorColorColorColor', 'TrueColorColorColorColorColorColorColorColorColor', 'RGBColorColorColorColorColorColorColorColorColor', 'CMYKColorColorColorColorColorColorColorColorColor', 'YCbCrColorColorColorColorColorColorColorColorColor', 'XYZColorColorColorColorColorColorColorColorColor', 'LabColorColorColorColorColorColorColorColorColor', 'LuvColorColorColorColorColorColorColorColorColor', 'sRGBColorColorColorColorColorColorColorColorColor', 'AdobeRGBColorColorColorColorColorColorColorColorColor', 'ProPhotoRGBColorColorColorColorColorColorColorColorColor', 'WideGamutRGBColorColorColorColorColorColorColorColorColor', 'DisplayP3ColorColorColorColorColorColorColorColorColor', 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'SECAMColorColorColorColorColorColorColorColorColorColorColorColorColor', 'MonochromeColorColorColorColorColorColorColorColorColorColorColorColorColor', 'GrayscaleColorColorColorColorColorColorColorColorColorColorColorColorColor', 'IndexedColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'TrueColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'RGBColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'CMYKColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'YCbCrColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'XYZColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'LabColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'LuvColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'sRGBColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 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'SMPTECColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'DCDMColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'Rec601ColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'DCI-P3ColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'NTSCColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'PALColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'SECAMColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'MonochromeColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'GrayscaleColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'IndexedColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'TrueColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'RGBColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 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'NTSCColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'PALColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'SECAMColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'MonochromeColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'GrayscaleColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'IndexedColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'TrueColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'RGBColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'CMYKColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'YCbCrColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'XYZColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 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'sRGBColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColorColor', 'AdobeRGBColorColorColorColorColorColorColorColorColorColorColorColorColorColor