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ADV7280 image quality is quite poor

We are using the ADV7280 to convert a PAL source to a BT.656 output with I2P deinterlacer enabled.

This is working well, but the image qualitiy is quite poor. There are a lot of stripes (luma) in the Video after the convertion, see the picture (stripes from down left to upper right)

Does anybody know how to optimize this?

Thanks

Michael