TDA2PXEVM: LDC lut header file in vision sdk is working?

HJ Kim

Part Number: TDA2PXEVM

Hi,

I'm evaluating LDC feature of iss simcop. There is noisy image as below and no LDC effect when LDC is enabled.

The LDC lut header file in vision_sdk\apps\src\rtos\iss\src\sensor\iss_tables\iss_tables_ldc_lut_1920x1080.h in vision sdk is used. Camera is OV2775 TIDA1130 Sensor on Fusion Platform (Only on TDA2px)

Is there my mistake or a problem in sample lut header file?

Thanks.

My only changes at vision sdk 3.3 were

■ vision_sdk\apps\src\hlos\adas\src\usecases\iss_capture_isp_display\chains_issIspSimcop_Display.c
    pAppCtrlIssPrms->issSensorInfo.simcopOpMode =
        ISSM2MSIMCOP_LINK_OPMODE_LDC; // ISSM2MSIMCOP_LINK_OPMODE_MAXNUM;
.....
    pUcObj->IssM2mSimcopPrm.channelParams[0u].operatingMode =
        ISSM2MSIMCOP_LINK_OPMODE_LDC; // ISSM2MSIMCOP_LINK_OPMODE_VTNF;

■ vision_sdk\apps\src\rtos\iss\src\common\app_util_iss.c
#if 0
    IssUtils_InitSimcopConfig(&pIssObj->simcopCfg, TRUE, TRUE);
#else
if (pIssObj->appSensorInfo.simcopOpMode == ISSM2MSIMCOP_LINK_OPMODE_LDC)
     IssUtils_InitSimcopConfig(&pIssObj->simcopCfg, FALSE, TRUE);
else
     IssUtils_InitSimcopConfig(&pIssObj->simcopCfg, TRUE, TRUE);
#endif

■ bypasLdc = FALSE, LDC lut is default

■ bypasLdc = FALSE, LDC lut is filled with '0x00'

■ bypasLdc = TRUE

over 7 years ago

0 Brijesh Jadav over 7 years ago

TI__Guru**** 477005 points

Hi Kim,

the default LDC LUT might not be good for your lens. You need to regenerate this Lut based on your lens parameter.

Rgds,
Brijesh

0 HJ Kim over 7 years ago in reply to Brijesh Jadav

Expert 1460 points

Hi Brijesh,

The default lut can not be good, but I assume there should not be such a noisy image.

The default lut file can make color noisy image?

Thanks.

0 Sujith over 7 years ago in reply to HJ Kim

TI__Genius 12455 points

Hi Kim,

Can you please check if issue is present with LDC disabled? or you could reset the LDC LUT (i.e. set the contents of LDC LUTs to 0) and check

Regards, Sujith

0 HJ Kim over 7 years ago in reply to Sujith

Expert 1460 points

Hi Sujith,

Please refer to the attached image in upper question box.
When LDC mode is disabled, it's ok.

Thanks

0 Brijesh Jadav over 7 years ago in reply to HJ Kim

TI__Guru**** 477005 points

Hi Kim,

Yes, the Lut can introduce the artifacts as it is back mapping table. If the back mapping is as per the lens properties, it can back map to incorrect pixels and can introduce artifacts in the output.

Rgds,

Brijesh

0 HJ Kim over 7 years ago in reply to Brijesh Jadav

Expert 1460 points

For LDC usecase in hlos,
I think all required codes are not implemented in current vision sdk v3.3 or 3.4.
I will share the result after doing it.

Thanks.

0 HJ Kim over 7 years ago in reply to HJ Kim

Expert 1460 points

I opened another ticket for this issue. Additional data was updated.
e2e.ti.com/.../717462

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TDA2PXEVM: LDC lut header file in vision sdk is working?