Lens Correction Parameters

[bigwisu]

Hi I'm trying to correct images taken by a DJI Phantom 2 Vision+, I'm used to correct gopro 3+ images using

convert SOURCE.JPG -distort barrel '0.01359 -0.06034 -0.10618' FLAT.JPG

Params above taken from http://www.imagemagick.org/Usage/lens/

Photoshop can correct Images using the profile below.. How do I translate the params in the below script to ImageMagick lens correction?

TIA

-------------------------------

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.5-c002 1.148022, 2012/07/15-18:06:45 ">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
xmlns:stCamera="http://ns.adobe.com/photoshop/1.0/camera-profile">
<photoshop:CameraProfiles>
<rdf:Seq>
<rdf:li>
<rdf:Description
stCamera:Author="Adobe Systems, Inc."
stCamera:Make="DJI"
stCamera:Model="PHANTOM VISION FC200"
stCamera:CameraRawProfile="False"
stCamera:CameraPrettyName="PHANTOM VISION FC200"
stCamera:LensPrettyName="PHANTOM VISION FC200"
stCamera:ProfileName="Adobe (PHANTOM VISION FC200)"
stCamera:SensorFormatFactor="5.6"
stCamera:ImageWidth="4384"
stCamera:ImageLength="3288"
stCamera:FocalLength="5"
stCamera:FocusDistance="1.570823"
stCamera:ApertureValue="2.970854">
<stCamera:PerspectiveModel>
<rdf:Description
stCamera:Version="2"
stCamera:FocalLengthX="0.601474"
stCamera:FocalLengthY="0.601474"
stCamera:ImageXCenter="0.504757"
stCamera:ImageYCenter="0.517984"
stCamera:ResidualMeanError="0.009902"
stCamera:ResidualStandardDeviation="0.018443"
stCamera:RadialDistortParam1="-0.354597"
stCamera:RadialDistortParam2="0.119435"
stCamera:RadialDistortParam3="-0.018339">
<stCamera:ChromaticRedGreenModel
stCamera:FocalLengthX="0.60149"
stCamera:FocalLengthY="0.60149"
stCamera:ImageXCenter="0.504768"
stCamera:ImageYCenter="0.517995"
stCamera:ResidualMeanError="0.009897"
stCamera:ResidualStandardDeviation="0.018448"
stCamera:ScaleFactor="1.000181"
stCamera:RadialDistortParam1="0.00029"
stCamera:RadialDistortParam2="-0.000741"
stCamera:RadialDistortParam3="0.000598"/>
<stCamera:ChromaticGreenModel
stCamera:FocalLengthX="0.60149"
stCamera:FocalLengthY="0.60149"
stCamera:ImageXCenter="0.504768"
stCamera:ImageYCenter="0.517995"
stCamera:ResidualMeanError="0.00989"
stCamera:ResidualStandardDeviation="0.018426"
stCamera:RadialDistortParam1="-0.354821"
stCamera:RadialDistortParam2="0.119587"
stCamera:RadialDistortParam3="-0.018376"/>
<stCamera:ChromaticBlueGreenModel
stCamera:FocalLengthX="0.60149"
stCamera:FocalLengthY="0.60149"
stCamera:ImageXCenter="0.504768"
stCamera:ImageYCenter="0.517995"
stCamera:ResidualMeanError="0.009903"
stCamera:ResidualStandardDeviation="0.018462"
stCamera:ScaleFactor="1.00064"
stCamera:RadialDistortParam1="0.00143"
stCamera:RadialDistortParam2="-0.00279"
stCamera:RadialDistortParam3="0.001636"/>
</rdf:Description>
</stCamera:PerspectiveModel>
</rdf:Description>
</rdf:li>
</rdf:Seq>
</photoshop:CameraProfiles>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>

-------------------------------

[snibgo]

For a GoPro Hero 3 (not 3+, but that may be the same), I find arctan() gives the best conversion to rectilinear. See my debarrel page.

For the DJI Phantom, you would need to experiment.

Code: Select all

stCamera:RadialDistortParam1="-0.354597"
stCamera:RadialDistortParam2="0.119435"
stCamera:RadialDistortParam3="-0.018339"

You could try these as the three parameters. Photoshop seems to give corrections for the colour channels, but I don't know how you would use the data.

[lukerjbgv]

Is there anywhere you can find information about the actual lenses of the gopro3+ and the dji phantom 2 vision plus? By comparing the lens properties you can probably determine the right parameters to use.