TDA2PXEVM: Where is the LDC table for OV2775 module with fisheye lens

HJ Kim

Part Number: TDA2PXEVM

Hi,

The camera capture (capture source: OV2775 TIDA1130 Sensor on Fusion Platform) is working well in TDA2Px EVM with Fusion Application Board with OV2775.

I'd like to add LDC feature. But I can't find a sample LDC table of OV2775 module. Should I make it by myself?

Thanks

over 7 years ago

0 Mayank Mangla over 7 years ago

TI__Mastermind 24525 points

LDC has not been tuned for OV2775. You may use DCC Tuning Tool to generate the LUT for the lens you are using.

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

Expert 1460 points

A reference table (iss_tables_ldc_lut_1920x1080.h) for fisheye lens should be ok. It will not be problem if it is not tuned.
Can you please share one?

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

TI__Guru 59600 points

Hi Kim,

The LUT depends on other LDC parameters.
You may refer to this link for more details: e2e.ti.com/.../662696
Once you get the binary file generated, you can convert it from binary format back into a header file in text format.

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

Expert 1460 points

Hi Gang Hua,

Thanks a lot for your reply.
I already checked out it, but it requires me some resources to implement one.

Another question,
I modified the HLOS usecase "iss_capture_isp_display" as below to enable LDC of SIMCOP.

pUcObj->IssM2mSimcopPrm.channelParams[0u].operatingMode =
ISSM2MSIMCOP_LINK_OPMODE_LDC; // org: ISSM2MSIMCOP_LINK_OPMODE_VTNF;

But I think it didn't work, because there was no difference after modifying iss_tables_ldc_lut_1920x1080.h.
Are there other points to enable LDC?

Thanks

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

TI__Guru 59600 points

Hi Kim,

I am not familiar with the usecases, but this is we I heard from the s/w team regarding how “iss_tables_ldc_lut_1920x1080.h” is used.
Please see if it helps you figuring out which LUT is actually used.

>> In the file vision_sdk/apps/src/rtos/iss/src/common/iss_utils.c, that specific table is being used on line 249 as the address for the LDC LUT when the IssUtils_InitSimcopConfig is being called.
>> This is being called in most ISS usecases.
>> In the vision_sdk/apps/src/rtos/usecases/iss_mult_capture_isp_deward_3dsv_rearview_tda3xx/chains_issMultCaptIspDeWarpRearView3dSv_Display.c file, we are including different LDC tables based on whether it is using rearview or the topdown view.

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

Expert 1460 points

Hi Gang Hua,

Thank you for your reply.

"iss_tables_ldc_lut_1920x1080.h" is used and it's included as below at common/iss_utils.c. The same file is uded, I checked by changing its file name and there's a compiler err.

UInt8 gChainsCommonIssLdcTable_1920x1080[] =
{
#include "iss_tables/iss_tables_ldc_lut_1920x1080.h"
};

Is it possible to enable LTC in current hlos usecase of vision SDK?

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

Expert 1460 points

I will followup LDC issue at another ticket e2e.ti.com/.../715856

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

TI__Guru**** 477995 points

Hi Kim,

Yes, it is possible, you need to change simcop mode in the simcop link.
If you are starting a new thread, please close this thread.

Rgds,
Brijesh

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TDA2PXEVM: Where is the LDC table for OV2775 module with fisheye lens