Messages

1

Feature Requests / Re: Rolling shutter integration

« on: July 15, 2016, 05:07:06 PM »

Hi Alex,
Any comments on this?

I heard pix4d has the correction for rolling shutter correction.

thanks.

2

General / Re: dji phantom 4 fcc330 lens correction profile+parameters for photoscan

« on: June 15, 2016, 08:12:58 PM »

Thank you for your reply! It is very useful!

I appreciate your time!

3

General / Re: dji phantom 4 fcc330 lens correction profile+parameters for photoscan

« on: June 14, 2016, 08:36:53 PM »

Hello olivine,

You can find the description of the distortion model in PhotoScan Manual:
http://www.agisoft.com/pdf/photoscan-pro_1_2_en.pdf

Thank you Alexey.

I have read the manual. Two questions for you:
1/the .lcp file is:
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 5.6-c128 79.159124, 2016/03/18-14:01:55        ">
 <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 (www.adobe.com)"
       stCamera:Make="DJI"
       stCamera:Model="FC330"
       stCamera:CameraRawProfile="False"
       stCamera:CameraPrettyName="FC330"
       stCamera:LensPrettyName="PHANTOM 4 FC330"
       stCamera:ProfileName="Adobe (PHANTOM 4 FC330)"
       stCamera:SensorFormatFactor="5.7"
       stCamera:ImageWidth="4000"
       stCamera:ImageLength="3000"
       stCamera:FocusDistance="1.322811"
       stCamera:ApertureValue="2.970854">
      <stCamera:PerspectiveModel
       stCamera:Version="2"
       stCamera:FocalLengthX="0.581668"
       stCamera:FocalLengthY="0.581668"
       stCamera:ImageXCenter="0.49812"
       stCamera:ImageYCenter="0.477037"
       stCamera:ResidualMeanError="0.000203"
       stCamera:ResidualStandardDeviation="0.000151"
       stCamera:RadialDistortParam1="-0.004567"
       stCamera:RadialDistortParam2="-0.006062"
       stCamera:RadialDistortParam3="0.003042"/>
      </rdf:Description>
     </rdf:li>
     <rdf:li>
      <rdf:Description
       stCamera:Author="Adobe (www.adobe.com)"
       stCamera:Make="DJI"
       stCamera:Model="FC330"
       stCamera:CameraRawProfile="False"
       stCamera:CameraPrettyName="FC330"
       stCamera:LensPrettyName="PHANTOM 4 FC330"
       stCamera:ProfileName="Adobe (PHANTOM 4 FC330)"
       stCamera:SensorFormatFactor="5.7"
       stCamera:ImageWidth="4000"
       stCamera:ImageLength="3000"
       stCamera:FocusDistance="3"
       stCamera:ApertureValue="2.970854">
      <stCamera:PerspectiveModel>
       <rdf:Description
        stCamera:Version="2"
        stCamera:FocalLengthX="0.581668"
        stCamera:FocalLengthY="0.581668"
        stCamera:ImageXCenter="0.49812"
        stCamera:ImageYCenter="0.477037"
        stCamera:RadialDistortParam1="-0.004567"
        stCamera:RadialDistortParam2="-0.006062"
        stCamera:RadialDistortParam3="0.003042">
       <stCamera:VignetteModel
        stCamera:FocalLengthX="0.581668"
        stCamera:FocalLengthY="0.581668"
        stCamera:VignetteModelParam1="-0.056096"
        stCamera:VignetteModelParam2="0.036316"
        stCamera:VignetteModelParam3="-0.019203"/>
       </rdf:Description>
      </stCamera:PerspectiveModel>
      </rdf:Description>
     </rdf:li>
    </rdf:Seq>
   </photoshop:CameraProfiles>
  </rdf:Description>
 </rdf:RDF>
</x:xmpmeta>

I can only find fx, fy, k1, k2, k3 directly.

What are cx, cy, skew, k4, p1, p2, p3, p4?

2/Assume we have all the parameters, is the DEM generated by Dji Phantom 4 camera reliable for topographic research?

A separate question is:
If there is no GPS info in the images, will Photoscan still be able to align the photoes? Take longer time?
 

4

General / Re: dji phantom 4 fcc330 lens correction profile+parameters for photoscan

« on: June 14, 2016, 07:51:35 PM »

 Alexey, could you plz comment on that?

Thanks

5

General / dji phantom 4 fcc330 lens correction profile+parameters for photoscan

« on: June 12, 2016, 08:27:02 PM »

Hi
The Adobe Lightroom has new update in June. I have uploaded the lens correction profile files of dji phantom 4 fcc330.

How should I fill the Calibration parameters list in photoscan for all the images taken by phantom 4? What are the values for the following parameters:

fx, fy

cx, cy

skew

k1, k2, k3, k4

p1, p2, p3, p4

I am new to this field, and I feel there are parameters missing from the .lcp files.

Thank you in advance!

6

General / Re: dji phantom 4 lens distortion correction+customized shooting time interval

« on: June 06, 2016, 07:52:06 PM »

Thanks drykovanov!

7

General / dji phantom 4 lens distortion correction+customized shooting time interval

« on: June 06, 2016, 09:38:35 AM »

Hi guys,
I bought a dji phantom 4 in order to generate high resolution DEM.

I took some images yesterday, and can not align them well. Only 7 of 30 images are aligned. All of them were labeled NC, which means not calibrated (from the manual).

I tried to get an Adobe Lightroom, but there is no lens distortion correction for phantom 4.

My questions are:
1)Is it necessary to make lens distortion correction before importing the images to photoscan?

2)How much will the final result be affected without these correction? If the errors of DEM due to this issue are within several centimeters, I don't think it is a big issue.

An separate question is (Maybe I should ask in Dji's forum, but I would like to try here as well):
The minimum time interval for jpg is 5 seconds, while 10 seconds for raw file. However, we need 80% forward overlap, this time interval is not small enough. Is there a way to solve this problem?

Thanks in advance!