PROCESSOR-SDK-TDAX: Image flipping

Gangatharan Kumarasamy

In TDA4 context, we need to flip the received image (from MIPI CSI-RX 0) either vertical or horizontal for the application. It is a 8bpp 3.2Mbits picture 30fps.

Could you pls. share information here on how to do it using the Hardware accelerators ?

We use TIOVX framework for capturing.

Also, we need to calculate the CRC (CRC16) over the image buffer to verify the integrity of the image received from the Imager. Does CRC calculation can be delegated to any of the on-board accelerators to avoid CPU dependency ?

kindly share your inputs. Thanks !

over 1 year ago

0 Brijesh Jadav over 1 year ago

TI__Guru**** 430475 points

Hi,

Hardware accelerator cannot flip the images. The only place you can flip the image is in the DSS.

For CRC, you can probably use mCRC module, but please note that it generates 64bit CRC signature.

Regards,

Brijesh

0 Gangatharan Kumarasamy over 1 year ago in reply to Brijesh Jadav

Prodigy 30 points

Hi,

In our case, we need to feed to TDA4 based SW application. Hope output of DSS goes into a Display port with no access to Software applications. Is this understanding correct.

mCRC was known but constraint was that we need CRC16.

Thanks

0 Brijesh Jadav over 1 year ago in reply to Gangatharan Kumarasamy

TI__Guru**** 430475 points

Hi,

Yes, DSS reads from memory, flips the images and then sends it out to the Display Port.

mCRC supports different input data size, but i think signature is fixed to 64bit.

Regards,

Brijesh

0 Gangatharan Kumarasamy over 1 year ago in reply to Brijesh Jadav

Prodigy 30 points

Hi again, we could see a description in the DSS that it can mirror the image (our expectation is flip along Y axis), and write back pipeline to DDR. Can it deal with RAW 8bit image and whether application can use it back in the processing OVX pipeline ?

0 Brijesh Jadav over 1 year ago in reply to Gangatharan Kumarasamy

TI__Guru**** 430475 points

Hi Gangatharan,

No, DSS directly does not support RAW8 input format. It supports different YUV and RGB format. But lets say, if you treat input as luma data and provide additional chroma bufffer filled with 0x80, you can get back this image and can do flipping. I think this method is supported (not flipping) in DSS OpenVX node.

Regards,

Brijesh

Processors

Processors forum

PROCESSOR-SDK-TDAX: Image flipping