AM62A7: Can ISP support parameters readout through any interface?

xingxing gu

Part Number: AM62A7

Tool/software:

Our customer want to read isp parameters like brightness, sharpness and etc. Can the sdk support that and if any reference code?

3 months ago

0 Gang Hua 3 months ago

TI__Guru 59820 points

Hi Xingxing,

xingxing gu said:
Our customer want to read isp parameters like brightness, sharpness and etc.

I don't think there is a single parameter in VISS for brightness or sharpness.
The sharpness tuning is mapped and programmed to VISS-EE registers.

0 Dilna K 3 months ago

TI__Intellectual 1380 points

Hi Xingxing,

You can read brightness via 'v4l2-ctl' commands.

'v4l2-ctl -d /dev/videoX --get-ctrl=brightness'

0 xingxing gu 2 months ago in reply to Dilna K

Prodigy 80 points

Our customer will according this value to determine if need turn on the LED light. Do you think it is doable?

0 Bas Vermeulen 2 months ago in reply to Dilna K

Intellectual 870 points

Hi Dilna K ,

The ticsi2rx driver that is used by /dev/videoX does not have any controls, so it's not possible to read the brightness control from that device.

Regards,

Bas Vermeulen

0 Gang Hua 2 months ago in reply to xingxing gu

TI__Guru 59820 points

xingxing gu said:
Our customer will according this value to determine if need turn on the LED light. Do you think it is doable?

ISP does not have a readable parameter for brightness.
It might be possible for you to read the sensor exposure time and gain to infer the scene brightness if you have set up Auto Exposure.

0 Jianzhong Xu 2 months ago in reply to Gang Hua

TI__Guru 59405 points

Hi Xingxing,

I agree with Gang that the best way for you is to read the exposure and analog gain provided by the 2A algorithm for the sensor: https://github.com/TexasInstruments/edgeai-gst-plugins/blob/main/ext/tiovx/gsttiovxisp.c#L2338

For example, when the exposure and analog gain are very close or equal to the maximum values specified by the sensor, it most likely means that the scene is dark and you can probably turn on the LED light.

Dilna K the "brightness" parameter may not be available for every sensor. In addition, you should use /dev/v4l-subdev to check sensor parameters. Please refer to this FAQ: How can I change the sensor parameters using v4l2-ctl?

Regards,

Jianzhong

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AM62A7: Can ISP support parameters readout through any interface?