Dear ADI expert,
Customer has saw video jitter at output of ADV728XA-M when using I2P function.
And I also saw other post mentioning : https://analogdevices.telligenthosting.net/video/f/q-a/7704/adv7280-cvbs-ntsc-i2p-how-suppress-the-image-jitter
But since It's ADV7280 which is older part, so whether is this jitter artefact also expected for ADV7280A version? (any design change to improve this issue?)
Thank you very much!
If you are using the interlaced to progressive (I2P) block in the ADV7280. The I2P block of the ADV728x works by storing a few lines of video. e.g. lines 1, 3, 5 on an odd field. It will then interpolate between these lines to generate the missing lines e.g. it will interpolate for lines 2 and 4.The I2P does contain a smoothing filter to minimize artifacts but some artifacts can still occur.
Solutions :1) Use a deinterlacer in your back end processor rather than using the I2P block of the ADV7280. The backend processor will have to store an odd frame of video in a buffer, then store an even frame of video and then switch these two frames together to generate a progressive field. This will minimize interlaced to progressive errors but will add a delay to your system.Be sure to introduce a line counter or similar software control to ensure that you do not get buffer overflows.
Thanks for your reply so it seems this is still related to I2P block and this artefact is still expected in ADV7280A version.
I will help to reply to customer, thank you.