camera-lens

Options: auto | perspective | brown | fisheye | spherical

Set a camera projection type. Manually setting a value can help improve geometric undistortion. By default the application tries to determine a lens type from the images metadata. . Default: auto

Parameter Type:
String
Parameter Domain:
auto : Automatic selection of best camera projection model.
brown : Robust rectilinear projection model. Preferred by auto.
fisheye : Wide-angle / non-rectilinear projection model.
perspective : Legacy rectilinear projection model.
spherical : 360° camera projection model.
Parameter Default:
auto

Resource

Impact

CPU

●○○ | Low

GPU

○○○ | None

HDD

●○○ | Low

RAM

●○○ | Low

Time

●○○ | Low


What Are Camera Lens Models?

Camera Lens Models are projection/distortion models that OpenSFM uses to correct for the optics of the camera platforms that record our images. These corrections are essential for proper camera/scene modeling, and therefore, proper reconstruction of the data.

When are manual selections appropriate?

Manually choosing a Camera Lens Model is currently only recommended in the case of Spherical Cameras (GoPro Fusion, GoPro Max, Insta360, Kodak PixPro, etc.) as these are currently not detected automatically by OpenSFM.

Why would one use a particular Camera Lens Model?

In rare cases, OpenSFM may not be able to detect (or retrieve from its Camera database) the correct Camera Lens Model for your particular sensor, in which case you should select the closest appropriate model. When in doubt, try specifying brown first.

Example Images

The following examples are all data taken with a standard Rectilinear Lens. Manual selection of the various Camera Lens Models is demonstrated to show some differences in how this will affect reconstruction.

auto : Rectilinear Data

Rectilinear data rendered by ``auto`` Camera Lens Model

This Point Cloud shows a proper reconstruction via the auto (brown) Camera Lens Model, which is appropriate for this sensor.

brown : Rectilinear Data

Rectilinear data rendered by ``brown`` Camera Lens Model

As in the prior example, this Point Cloud is reconstructed via the brown Camera Lens Model.

fisheye : Rectilinear Data

Rectilinear data rendered by ``fisheye`` Camera Lens Model

In this Point Cloud reconstruction, severe bowling and other artifacts have been introduced via the use of the wrong Camera Lens Model.

perspective : Rectilinear Data

Rectilinear data rendered by ``perspective`` Camera Lens Model

This Point Cloud rendered well, very similar to the auto and brown examples. One may see artifacts in the perspective Camera Lens Model in very large collections, or over very flat/homogenus terrain (agricultural fields). In such cases, forcing brown may help.

spherical : Rectilinear Data

Rectilinear data rendered by ``spherical`` Camera Lens Model

This Point Cloud failed to reconstruct properly due to the manual selection of the fisheye Camera Lens Model. Similar failures to reconstruct can often indicate the wrong manual selection, or in edge cases, wrong auto selection of the Camera Lens Model, and you are advised to try another Model that is more appropriate.

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