VD66GY + Rockchip RV1106 ISP – Green color cast and low saturation, need sensor tuning guidance

[satishkatti]

 

Hi ST team,

I am using the ST VD66GY image sensor connected to a Rockchip RV1106 processor with the Rockchip hardware ISP.

I have successfully enabled the camera pipeline and can capture images, but the image quality has a strong greenish color cast and the colors look desaturated, even under a bright indoor room with white LED lighting.

Current setup

• Sensor: ST VD66GY

• Processor: Rockchip RV1106

• ISP: Rockchip RKISP (hardware ISP)

• Capture: RAW from VD66GY → RKISP → Image output

Observed issue

• Strong green tint across the entire image

• Skin tones appear gray/green

• Low color saturation

• Indoor lighting is much brighter than what the captured image suggests

I have attached three sample images captured with the current ISP settings.

Questions

1. Does ST provide an IQ tuning file or reference tuning parameters for VD66GY when used with a third-party ISP such as Rockchip RKISP?

2. Are there recommended AWB calibration, Color Correction Matrix (CCM), or Lens Shading Correction (LSC) values for this sensor?

3. Is the green cast typically caused by missing sensor calibration data, or should it be corrected entirely through ISP tuning?

4. Is there any recommended register configuration for VD66GY that improves color reproduction before ISP processing?

Any guidance or reference tuning data would be greatly appreciated.

Thank you!