TDA4VM: LDC DCC Tuning details

Dinesh bharathi

Part Number: TDA4VM

Hi,

I am currently working on the DCC tuning, in the : (+) [FAQ] TDA4VM: How to create a LDC mesh LUT for fisheye distortion correction on TDA4? - Processors forum - Processors - TI E2E support forums

m- downsampling factor which reduces the number of entries. I could see the changes happening in the mesh.txt
but i couldn't understand the effect of 's' valve on the output, though it does change the valves in the mesh.txt I dont see any change in the tuned output, the scale remains 1920*1280 in the dcc preview image even after setting S-4 in the matlab calculation. Can you help me understand on what exactly does the s valve do?

Regards,
Dinesh

over 2 years ago

0 Dinesh bharathi over 2 years ago

Intellectual 751 points

Oh, There is a scaling difference but the image in DCC tool just gets padded to 1920*1280 for the output. As the output size is mentioned that way.

This is fine but as I set S-3: NaN starts to appear inside the mesh.txt. Is there a way around this?
1563.mesh.txt

0 Gang Hua over 2 years ago in reply to Dinesh bharathi

TI__Guru 52915 points

Could you please share the preview images for input and output?

As from the FAQ: >> "s" decides with size of the output view.
If you use a "s" value that is too large, it may go out of the input image boundary or your provided lens curve range.