TDA4VM: VPAC-AWB config

Hi Cesar,

We have tested the AWB for IMX390 on SK-AM62A and it worked well.
Which EVM are you working on?

You may check this app note below for any AWB related topics.

www.ti.com/.../sprad86

cesar.xu said:

2.Research the source code, found that the calculation result(ae_awb_result) is not set to sensor;

As "ae_awb_result" is a pointer to an openvx object, you don't see it is used directly.
"self->viss_obj.ae_awb_result_arr[ ]" is used for passing the information.

    ae_awb_result_ref =
        (vx_user_data_object) vxGetObjectArrayItem (self->
        viss_obj.ae_awb_result_arr[0], i);
    h3a_stats_ref =
        (vx_user_data_object) vxGetObjectArrayItem (self->
        viss_obj.h3a_stats_arr[0], i);

    vxMapUserDataObject (h3a_stats_ref, 0,
        sizeof (tivx_h3a_data_t), &h3a_buf_map_id, (void **) &h3a_data,
        VX_READ_ONLY, VX_MEMORY_TYPE_HOST, 0);
    vxMapUserDataObject (ae_awb_result_ref, 0,
        sizeof (tivx_ae_awb_params_t), &aewb_buf_map_id,
        (void **) &ae_awb_result, VX_WRITE_ONLY, VX_MEMORY_TYPE_HOST, 0);

Hi Gang Hua,

The sensor model we use now is OX03C10,RAW-12bit-1920x1080, which is temporarily displayed with Imx390 parameters through gst command. Now I want to change the AWB-related register of IMX390 to the AWB-related register of OX03C10.

Where is the gst tiovx source code for AWB configuration.

thanks & regards,

cesar

Hi Cesar,

If AWB does not work well, it is typically a calibration issue.

Did you follow the app note above for the calibration process?

cesar.xu said:

The sensor model we use now is OX03C10,RAW-12bit-1920x1080,

Could you please share your AWB calibration xml file and the raw/yuv images at the failure scene?

Hi Gang Hua,

I did not say that AWB does not work, I said that the temporary use of imx390 dcc 2a.bin can run normally; But now you want to modify the AWB of OX03C10, where should you add it in the source code;

Can you understand my needs; Want to know the source code location of gst tiovx for AWB configuration.

thanks & regards,

Cesar

Hi Cesar,

cesar.xu said:

But now you want to modify the AWB of OX03C10, where should you add it in the source code;

In this case, you may follow the app note for AWB calibration https://www.ti.com/lit/pdf/sprad86

7.6 Auto White Balance (AWB)

Hi Gang Hua,

This is the description of DCC_TOOL about AWB tuning generated bin file, but finally read to the user and set in the sensor; Now the question is where in the gts tiovx code to set AWB, I need to add a new sensor configuration;

thanks & regards,

Cesar

Hi Gang Hua,

Now there is a sensor whose model is OX03C10 and parameter is 1920x1280p@60p. The AE parameter needs to be added. How to add the following mapping relationship.

thanks & regards,

Cesar

Hi Cesar,

cesar.xu said:

How to add the following mapping relationship.

That depends on your sensor driver.
The mapping is a conversion from your AE gain range to your sensor driver gain input values.

You may take a look at the following FAQs.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1262114/faq-setting-up-auto-exposure-ae-for-your-image-sensor-with-tda4-am6xa-isp-vpac

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1331426/faq-am62a7-how-to-modify-and-rebuild-ti-s-2a-algorithm-for-am6xa-processor-sdk-linux

Hi Gang Hua,

Ask a question.

gst runs on linux, but the source code for calling this function( TI_2A_wrapper_process ) is on the rtos,

the path: rtos/imaging/ti_2a_wrapper/src/ti_2a_wrapper.c

How does gst call this rtos library

Regards,

Cesar

Hi Gang Hua,

"ti_2a_wrapper.c" is for the Linux copy of the 2A code compiled on Linux side.

Where is the compiled library and how does gst relate to it.

Regards,

Cesar

cesar.xu said:

Where is the compiled library and how does gst relate to it.

I am not familiar with these edgeai s/w details.
You may have to check the makefiles for gstreamer.

For AM62A, there is a frimware builder for compiling things that are not exposed at the gstreamer level.

https://www.ti.com/tool/PROCESSOR-SDK-AM62A?keyMatch=am62a%20firmware%20builder&tisearch=universal_search

Hi Gang Hua,

"You may have to check the makefiles for gstreamer."

Please reschedule relevant experts.

Thank you for your support.

Regards,

Cesar

Hi Cesar,

cesar.xu said:

Please reschedule relevant experts.

Please start a new thread with a proper title for gstreamer/makefile questions.
That will be assigned to a gstreamer expert.

If you have any further questions about AWB calibration/configuration, we can keep this thread open.

Hi Gang Hua,

gst cmd：

Attempt to modify the AE threshold

print AE_TI_process calculation results

But how can the exposure time exceed the set maximum (200)

Regards,

Cesar

Hi Cesar,

That should not happen if AE is set up properly.

You may refer to the following links for setting up AE.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1262114/faq-setting-up-auto-exposure-ae-for-your-image-sensor-with-tda4-am6xa-isp-vpac

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1303303/faq-am62a7-how-to-set-the-minimum-maximum-exposure-time-and-analog-gain-for-2a-algorithm

You may check and print out AE internal states in this function.

https://git.ti.com/cgit/processor-sdk/imaging/tree/algos/ae/src/TI_aaa_ae.c?h=main#n137

BTW, these 2 lines are not good for IMX390 as stated in the FAQ links above.