18.1. About the Deinterlacer IP
The bob algorithm duplicates each line of a video such that the IP produces two lines of data for each one line of incoming data. The deinterlacing algorithm can be setup for:
- Deinterlacing F0 fields while dropping F1 fields
- Deinterlacing F1 fields while dropping F0 fields
- Deinterlacing both F0 and F1 fields
For the bob deinterlacer, with a regular input sequence of alternating field types, the frame rate on the output matches the input field rate when deinterlacing both F0 and F1 fields. Otherwise the IP halves the field rate.
The weave algorithm creates an output frame by filling all the missing lines in the current field with lines from the previous field. With a regular input sequence of alternating field types, the IP halves the field rate.
The IP is available as full or lite variants. For more information on full and lite, refer to the Intel FPGA Streaming Video Protocol Specification. For full variants, the deinterlacer IP decodes input resolutions and field type by reading image information packets. Lite variants use the register interface to determine input resolutions and whether the video is progressive or interlaced. Lite variants then decode the axi4s_vid_in_tuser signal to determine the incoming field's interlaced type. If you require weave or motion adaptive deinterlacing, use protocol converters and the video and image processing suite deinterlacer II IP.