How to compute the sensor sizes in mm from exif data of an image

Hello,

Here are the metadata of my image obtained with imfinfo and imfinfo.DigitalCamera:

imf = 

              Filename: [1x132 char]
           FileModDate: '02-Oct-2014 16:32:28'
              FileSize: 7115736
                Format: 'jpg'
         FormatVersion: ''
                 Width: 4608
                Height: 3456
              BitDepth: 24
             ColorType: 'truecolor'
       FormatSignature: ''
       NumberOfSamples: 3
          CodingMethod: 'Huffman'
         CodingProcess: 'Sequential'
               Comment: {}
      ImageDescription: '                               '
                  Make: 'NIKON'
                 Model: 'COOLPIX AW100  '
           Orientation: 1
           XResolution: 300
           YResolution: 300
        ResolutionUnit: 'Inch'
              Software: 'COOLPIX AW100V1.0              '
              DateTime: '2014:10:02 16:32:29'
      YCbCrPositioning: 'Co-sited'
         DigitalCamera: [1x1 struct]
               GPSInfo: [1x1 struct]
         ExifThumbnail: [1x1 struct]

imf.DigitalCamera

ans = 

                 ExposureTime: 0.0400
                      FNumber: 3.9000
              ExposureProgram: 'Normal program'
              ISOSpeedRatings: 400
                  ExifVersion: [48 50 51 48]
             DateTimeOriginal: '2014:10:02 16:32:29'
            DateTimeDigitized: '2014:10:02 16:32:29'
      ComponentsConfiguration: 'YCbCr'
       CompressedBitsPerPixel: 4
            ExposureBiasValue: 0
             MaxApertureValue: 3.9000
                 MeteringMode: 'Pattern'
                  LightSource: 'unknown'
                        Flash: [1x148 char]
                  FocalLength: 5
                    MakerNote: [1x10536 double]
                  UserComment: [1x128 double]
              FlashpixVersion: [48 49 48 48]
                   ColorSpace: 'sRGB'
             CPixelXDimension: 4608
             CPixelYDimension: 3456
          InteroperabilityIFD: [1x1 struct]
                   FileSource: 'DSC'
                    SceneType: 'A directly photographed image'
               CustomRendered: 'Normal process'
                 ExposureMode: 'Auto exposure'
                 WhiteBalance: 'Auto white balance'
             DigitalZoomRatio: 0
        FocalLengthIn35mmFilm: 28
             SceneCaptureType: 'Landscape'
                  GainControl: 'High gain up'
                     Contrast: 'Normal'
                   Saturation: 'Normal'
                    Sharpness: 'Normal'
         SubjectDistanceRange: 'Close view'
                  UnknownTags: [1x1 struct]

I guess from this information, I should be able to compute the width and height of the sensor but I cannot manage to figure out how. Note that I cannot manually enter the CDD width or any other information. Would you have any idea?

Cheers!

[Mike Leonard]

The only way I see of calculating the sensor size is using the actual "Focal Length" and "FocalLengthIn35mmFilm" ratio using the size of a standard 35 mm frame area. This would only be approximate but close. I don't know the formula, but it should not be hard to figure out. I did not see the "Actual Focal Length" listed in your Exif data. It is 2022 as I attempt to answer a 7 year old question. Hope it helps!

Better late than never?

Mike L.