Understanding distortion model calibration

[Vishwarath1990]

Hi,

I am following off of a distortion model calibration as shown in this video

https://www.youtube.com/watch?v=RxmUgSKT0pg

However when I replicate the steps I am not getting valid images on my front panel. The corrected image is all blurry. What is the reason and is there a way to rectify this?

Another question : Is it necessary that during calibration the grid covers the entire field of view?

cal2 is my calibrated image

rawimage4 is my snapped image

[KingPGeorge]

Hi Vishwarath,

Try the following tutorial:

https://www.youtube.com/watch?v=eWqq65ZZ0NQ

My understanding is that yes, the grid has to cover the entire field of view.

Thanks,

Peter George

Applications Engineer

National Instruments

[Hatef.fouladi]

first your image size should be same with your calibration image size
second your dots should be cover all port of camera view to solve all possible distortion in camera lens site

[Vishwarath1990]

Hi George,

My FOV is quite large. Do I zoom the image and crop it so that only the grid remains in view? In the video you suggested did the camera already focus on the grid leaving everything aside

[Vishwarath1990]

Hi Hatef,

What is the camera is grabbing some more regions than only the grid?

[Vishwarath1990]

Can anyone answer pls

[AmitShachaf]

I think that if you crop the image it should be OK.

You have the make sure that the second image you calibrating is exactly the same size in the same location.

[Vishwarath1990]

So I have the following workspace which I need to calibrate. I placed the grids adjoining one another. How should I go about doing this?