Why is the camera image distorted?

[homoly07]

Hi, guys.

i have the camera settings as followed and..

the snapshot saved and the image shown is somehow distored.

( can see the head and the arms are stretched) 

Is there any solutions to get rid of the distortion?

it seems like resolution issue but have no idea how to solve this issue. 

correct me if i'm wrong! 

Thanks all.

**python script for camera setting**

cameraName = "Perspective Aim Camera"

camera = vrCameraService.createCamera(cameraName,vrCameraTypes.ProjectionPerspective)

setTransformNodeTranslation(camera, 1125.54,-0.28,1137.66, True)

camera1 = vrNodeService.findNode('Perspective Aim Camera')

print(camera1)

setTransformNodeRotation(camera1, 55, 0, -90)

 

camera.setFov(108)

camera.setSensorSize(QVector2D(4.858,3.956))

camera.activate()

createSnapshot('D:/snap/test04', 1600,1300,1,False,0.0,0.0,0.0,False,1,0,0)

[michele_dellacianaK7KER · Accepted solution]

I think it's a problem related to a very short focal length.

Try to print camera.getFocalLength().

It is a perspective type deformation!

[Christian_Garimberti · Accepted solution]

Hi @homoly07,

108° FOV is a lens of about 8.7mm...

so a very short focal length, and like @michele_dellacianaK7KER says, is a normal perspective deformation.

If you need to manage this distortion you can try to use distortion maps.

Here you can find some info.

https://forums.autodesk.com/t5/vred-forum/distortion-map-with-spherical-camera/m-p/6029185#M1436

https://help.autodesk.com/view/VREDPRODUCTS/2024/ENU/?guid=VRED_Cameras_Advanced_CameraEd

Maybe this can help

Best

Chris

[homoly07]

 Thanks for the reply! 

i will try the distortion map.. but what kind of distortion map should i use?

is there any website i can infer?

Thanks again 🙂

[michael_nikelsky]

The distortion map won´t help you, it only shifts pixels to different positions. Its purpose is to correct small inaccuracies when matching a real camera image.

As Chris already said, your issue is completely caused by the wide angle FOV of 108 degree and it is similar to what you would get with a real lens with this FOV, 

[michael_nikelsky]

One more thing: VRED by default uses a vertical FOV. Some other applications and probably also some camera manufactures specify a horizontal FOV. Unless you have a square resolution this can cause quite a difference.