Where is the noise reduction control in STM32MP257 ISP?

yaomianfa · ‎2026-03-07

Platform:

SoC: STM32MP257
Sensor: GC05A2 (5MP)
Interface: CSI-2

Issue:
I'm working on camera integration with GC05A2 on STM32MP257. The raw image quality is acceptable, but after enabling AWB and CCM in the ISP pipeline, the output image shows severe noise (both luminance and color noise), especially in low-light conditions (<300 Lux) or shadow areas.

Questions:

Where is the noise reduction? Does STM32MP257 ISP have built-in hardware noise reduction (2D/3D NR)? If yes, how do I enable and control it through V4L2 or the driver?

PatrickF · ‎2026-03-09

Hi,

according to RM0547, I did not see any noise reduction inside the ISP.

ISP HW is stated to be a lite one, mostly intended to image analysis (e.g. AI image processing).

"Mid quality conversion for display and software analysis purposes (high quality conversion can be done in software upon trigger, for still-image only)"

Regards.

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yaomianfa · ‎2026-03-09

To the STM32 support team,

I am inquiring about the STM32MP257's built-in Image Signal Processor (ISP). If its native noise reduction capabilities are insufficient, are there any official, pre-optimized noise reduction algorithms provided by STMicroelectronics that can be deployed on this platform?

Specifically, I am looking for algorithms that can leverage hardware acceleration, either through the GPU or the NPU, to ensure efficient processing.

Thank you for your assistance.