image distortion

Discussion related to "under the hood" OpenMV topics.
oramafanis
Posts: 13
Joined: Sat Jul 04, 2020 3:34 am

image distortion

Postby oramafanis » Fri Aug 07, 2020 3:31 am

Hi there,

i have a strange problem with the images from an openmv h7 with global shutter module attached.
no matter what lens i will use always the distortion in the image is bigger from the left side that the right.

Is this a hardware fault?

I have tested all the lens ir telephoto and the lens that come with the global shutter module.
the camera is perfectly leveled to the surface of the inspection.

please hve a look on the image below i have took with the standart global shutter module:

Image

it looks like the sensor isnt allign well on the board?
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kwagyeman
Posts: 4458
Joined: Sun May 24, 2015 2:10 pm

Re: image distortion

Postby kwagyeman » Fri Aug 07, 2020 1:32 pm

We don't make any promises on how perfect the alignment of the sensor is.

But, what's the error exactly? Can you point out the issue in the image below?
Nyamekye,
mirkwood
Posts: 13
Joined: Tue Mar 10, 2020 4:08 am

Re: image distortion

Postby mirkwood » Sat Aug 08, 2020 1:40 am

If your lens is not directly over the top of the sensor it will do this.

I don't think you can physically change the alignment but you can use image.lens_corr with the x_off and y_off set to correct it (this is assuming it's just a x/y lens displacement).

Although the difference is so huge in your image I wonder if the lens and sensor are at an angle to each other? Is it cross threaded?
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kwagyeman
Posts: 4458
Joined: Sun May 24, 2015 2:10 pm

Re: image distortion

Postby kwagyeman » Sat Aug 08, 2020 11:19 am

Hi, just move the lens housing. It's probably not aligned via that. So, unscrew the two black acres on the back and adjust those to get it straightened.
Nyamekye,
oramafanis
Posts: 13
Joined: Sat Jul 04, 2020 3:34 am

Re: image distortion

Postby oramafanis » Sat Aug 08, 2020 2:59 pm

Ok then I will give it a try

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