topic Re: IMX8M Plus camera noise reduction in i.MX Processors

IMX8M Plus camera noise reduction

A_Hiroki — Wed, 21 Feb 2024 06:32:01 GMT

Hi Community!

The i.MX8M Plus reference manual states that the camera's ISP has a filter function to reduce noise.

・Denoising pre-filter
・Filter (Noise reduction)
・Enhanced Chroma Noise Reduction (CNR)

I have a few questions.

Which register should I operate to turn on these filters?
What exactly are these filters? Are there any formulas for calculating the filters?

Thank you in advance for your help

Best Regards,
Hiroki

Re: IMX8M Plus camera noise reduction

khang_letruong — Wed, 21 Feb 2024 11:25:59 GMT

Hi @A_Hiroki,

You can try the VVEXT tool from the isp-imx framework (found in /opt/imx8-isp/bin/ on a running board) and investigate the source code of relevant elements in the pipelines (sensor, isp, dwe, ...) here : https://github.com/nxp-imx/isp-vvcam

Regards,
Khang

Re: IMX8M Plus camera noise reduction

A_Hiroki — Wed, 21 Feb 2024 23:48:36 GMT

Hi, @khang_letruong

Thanks.
On the other hand, is it possible to know somewhere what the noise reduction algorithm is?
I would like to use it to analyze images.

Regards,
Hiroki

Re: IMX8M Plus camera noise reduction

khang_letruong — Thu, 22 Feb 2024 02:39:17 GMT

Hi @A_Hiroki,

I am afraid that the algos relevant to the ISP on iMX8MP are not open to public. You might need to ask the NXP FAE in your region.

Regards,
Khang