TDA4VH-Q1: Set Auto Exposure dynamic parameters at runtime

Evyatar Tamir

Part Number: TDA4VH-Q1

Using the J784S4 SDK with Vision Apps and TIOVX, I am looking at ways to conveniently configure the AE values for each sensor type, e.g. by reading a configuration file in the file system (without recompiling the sensor driver code).

When creating a TIOVX AEWB node, AE values are sent by the MCU FW to the AEWB kernel using control command IMAGE_SENSOR_CTRLCMD_GETEXPPRG , as struct IssAeDynamicParams.

I am wondering if there is another way to pass these values, either at node initialization or as an update after creating the AEWB node. From this answer it seems that in the past there was such a command (ALGORITHM_AEWB_LINK_CMD_SET_AE_DYNAMIC_PARAMS), but I have not found a modern equivalent. Is this functionality still available?

When using the TI 2A Wrapper these values are passed as parameter sensor_config_get *sensor_in_data, but as I understand it the 2A Wrapper is only relevant when capturing from Linux using V4L2, and is not applicable for J784S4 ADAS SDK capturing from the MCU FW, using a TIOVX node.

3 months ago

0 Jared McArthur 3 months ago

TI__Mastermind 23720 points

Hi Evyatar Tamir,

The AE params can be set during runtime using the IMAGE_SENSOR_CTRLCMD_SETEXPGAIN command.

Best,
Jared

0 Evyatar Tamir 3 months ago in reply to Jared McArthur

Prodigy 40 points

Thank you for replying.

I'm not sure this command relates to the same values. I was referring to the values in struct IssAeDynamicParams which are used to initialize the AE algorithm.
They are received by the AEWB node from the MCU FW's sensor driver.

As I understand it, the values sent by the AEWB node to the sensor driver at every iteration (in function sendExpGainToSensor), using control command IMAGE_SENSOR_CTRLCMD_SETEXPGAIN, are the AE results (to be applied to the sensor), in struct IssSensor_ExposureParams.

I was wondering if there is a mechanism to update the AE algorithm parameter values at runtime, like the old ALGORITHM_AEWB_LINK_CMD_SET_AE_DYNAMIC_PARAMS (from the pre-OpenVX “Links-and-Chains” framework). I haven't seen an equivalent in the current SDK's implementation, but thought it best to ask.

+1 Jared McArthur 3 months ago in reply to Evyatar Tamir

TI__Mastermind 23720 points

Hi Evyatar Tamir,

You are correct, there are no ways of setting those parameters at runtime.

Best,
Jared

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TDA4VH-Q1: Set Auto Exposure dynamic parameters at runtime