I implemented the lens distortion correction using the values found in the database lensfun. http://lensfun.sourceforge.net/
To CanonPowerShotS110 modified resolution 4048x3048 the indices K I have are {0.02413, -0.13243,0.04812};
When compared to the data with the database “Pix4Dmapper \ resources \ cameraDB \ icmdb.xml” values are different
<Camera name = “CanonPowerShotS110_5.2_4048x3048”>
<ImageWidth> 4048 </ ImageWidth>
<ImageHeight> 3048 </ ImageHeight>
<PixelSize> 1.5415 </ pixelSize>
<PrincipalPointXmm> 3:12 </ principalPointXmm>
<PrincipalPointYmm> 2.34925 </ principalPointYmm>
<LensType> perspective </ lensType>
<FocalLengthmm> 4.4 </ focalLengthmm>
<Distortion> 5 </ distortion>
<RadialK1> -0266 </ radialK1>
<RadialK2> 0079 </ radialK2>
<RadialK3> -0013 </ radialK3>
<TangentialT1> 0 </ tangentialT1>
<TangentialT2> 0 </ tangentialT2>
<PixelValue pixelType = “uint16” min = “- 1” max = “- 1” />
<CameraModelSource> internalDB </ cameraModelSource>
<BandConfig>
<Band name = “Red” centralWaveLength = “625” width = “0” weight = “0.0722” />
<Band name = “Green” centralWaveLength = “580” width = “0” weight = “0.2126” />
<Band name = “NIR” centralWaveLength = “880” width = “0” weight = “0.7152” />
</ BandConfig>
<BandConfig>
<Band name = “red edge” centralWaveLength = “715” width = “0” weight = “0.2126” />
<Band name = “Green” centralWaveLength = “480” width = “0” weight = “0.7152” />
<Band name = “Blue” centralWaveLength = “455” width = “0” weight = “0.0722” />
</ BandConfig>
<BandConfig>
<Band name = “Red” centralWaveLength = “660” width = “0” weight = “0.2126” />
<Band name = “Green” centralWaveLength = “550” width = “0” weight = “0.7152” />
<Band name = “Blue” centralWaveLength = “470” width = “0” weight = “0.0722” />
</ BandConfig>
</ Camera>
The Pix4D uses the values of icmdb to base or use any other data from Exif to perform the calculations?