TDA3: LDC: affine transform.

Naresh Patel

Prodigy 230 points

Part Number: TDA3

SIMCOP/LDC

input frame 1920x1088

output frame 800x1280

Meshtable: 120x68

Case 1:

I have working code for input frame 1920x1088 to output frame 1280x800 with the use of Simcop. In simcop configuration, we are not using affine transform for this undistortion image. This is working fine.

Case 2:

Now we have to rotate the output image 800x1280 and whereas input image is the same 1920x1088. I am wondering how can I implement this. Do I need to use affine transform feature to rotate the image?

Can you please guide me how can I solve my problem

Best regards,

Naresh

over 7 years ago

0 Mayank Mangla over 7 years ago

TI__Mastermind 24525 points

It can be done using LDC. You will need to create a lookup table for backmapping.

0 Naresh Patel over 7 years ago in reply to Mayank Mangla

Prodigy 230 points

How to create a lookup table.

0 Gang Hua over 7 years ago

TI__Guru 62890 points

Hi Naresh,

If you prepared the mesh LUT in case 1 for any kind of distortion correction or image warping, it is easier for you to create a new mesh LUT that includes the 90-degree rotation (you don't need to change anything in your code).

For programming the affine transform, you may refer to section "7.4.5 ISS SIMCOP LDC Module" in http://www.ti.com/lit/ug/spruie7c/spruie7c.pdf

Best,
Gang

0 Naresh Patel over 7 years ago in reply to Gang Hua

Prodigy 230 points

Hi Gang,

Thank you for the message.
You mean to say that only mesh table needs to be changed. Rotation should be applied to mesh table. No need to change in SIMCOP configuration??????

is it you want to mean.

Best regards,
Naresh

0 Gang Hua over 7 years ago in reply to Naresh Patel

TI__Guru 62890 points

Yes, if you already need to use the mesh LUT for some nonlinear warping, then use it to include the rotaion as well (keep affine transform off).
If you only need to resize and rotate the input image, then affine transform works well for you (keep mesh LUT off).