Keywords: sensor, distortion

Summary

This demo shows how to use the lens distortion model in the DIRSIG5 BasicPlatform sensor plugin. This feature allows you enhance the pinhole camera approximation employed by this sensor plugin with a common parametric lens distortion model (similar to the Brown-Conrady model) that allows the user to introduce common distortions including barrel, pin cushion, etc.

Important
 This feature is an advanced feature that is currently only available by hand-editing the .platform file to add the lens distortion coefficient.

Details

The details of the 5-parameter lens distortion model are provided in this section of the BasicPlatform sensor plugin manual.

Important Files

The demo.platform allows you to optionally define the parameters for the lens distortion model for each instrument in the platform. These corefficients for the 5-parameter model are supplied via the <distortion> element in the instruments <properties> element. The coefficients used in this demo are shown below:

        <instrument type="generic" name="New Instrument">
          <properties>
            <focallength>35</focallength>
            <distortion>
              <k1>5</k1>
              <k2>2.5</k2>
              <k3>-100</k3>
              <p1>0.1</p1>
              <p2>0.05</p2>
            </distortion>
          </properties>
          <focalplane enabled="true" name="New Focal Plane">
            ...
          </focalplane>

Setup

To run the simulation, perform the following steps:

  1. Run the DIRSIG5 demo.jsim file

  2. Load the resulting demo.img radiance file in the image viewer.

Results

images/demo.png
Figure 1. The resulting image featuring pronounced "pincushion" distortion.