How can I extract image metadata like exposure, width, height, or bitdepth using MATLAB?
Until recently I was using exifread, but this function no longer exists in the newest MATLAB version.
The other function is imfinfo, but it cannot read the 'EXPOSURE DATA' image.
How can I read the 'exposure' image?
exifread() deprecated 9 years ago. It has been replaced by imfinfo
info = imfinfo(filename) will return all information you want.
From the Matlab reference
Additional fields returned by some file formats:
JPEG and TIFF only — If filename contains Exchangeable Image File Format (EXIF) tags, then info might also contain 'DigitalCamera' or 'GPSInfo' (global positioning system information) fields.
info.Width, info.Height, info.BitDepth. The exposuretime as well as all other camera parameters are stored in the 1x1 struct info.DigitalCamera
Here's an example from
>> info = imfinfo('img_1771.jpg') info = Filename: 'C:\Users\fhempel\Desktop\tmp\img_1771.jpg' FileModDate: '07-Aug-2014 12:09:45' FileSize: 32764 Format: 'jpg' FormatVersion: '' Width: 480 Height: 360 BitDepth: 24 ColorType: 'truecolor' FormatSignature: '' NumberOfSamples: 3 CodingMethod: 'Huffman' CodingProcess: 'Sequential' Comment: {} Make: 'Canon' Model: 'Canon PowerShot S40' Orientation: 1 XResolution: 180 YResolution: 180 ResolutionUnit: 'Inch' DateTime: '2003:12:14 12:01:44' YCbCrPositioning: 'Centered' DigitalCamera: [1x1 struct] ExifThumbnail: [1x1 struct] >> info.DigitalCamera ans = ExposureTime: 0.0020 FNumber: 4.9000 ExifVersion: [48 50 50 48] DateTimeOriginal: '2003:12:14 12:01:44' DateTimeDigitized: '2003:12:14 12:01:44' ComponentsConfiguration: 'YCbCr' CompressedBitsPerPixel: 5 ShutterSpeedValue: 8.9688 ApertureValue: 4.6563 ExposureBiasValue: 0 MaxApertureValue: 2.9709 MeteringMode: 'CenterWeightedAverage' Flash: 'Flash did not fire, no strobe return detection function, auto flash mode, f...' FocalLength: 21.3125 MakerNote: [1x450 double] UserComment: [1x264 double] FlashpixVersion: [48 49 48 48] ColorSpace: 'sRGB' CPixelXDimension: 2272 CPixelYDimension: 1704 InteroperabilityIFD: [1x1 struct] FocalPlaneXResolution: 8.1143e+03 FocalPlaneYResolution: 8.1143e+03 FocalPlaneResolutionUnit: 2 SensingMethod: 'One-chip color area sensor' FileSource: 'DSC' CustomRendered: 'Normal process' ExposureMode: 'Auto exposure' WhiteBalance: 'Auto white balance' DigitalZoomRatio: 1 SceneCaptureType: 'Standard' All the information you think you are missing is stored in iminfo, just differently. Most of the parameters you want (including exposure data) are in
info=iminfo(fname); info.DigitalCamera 