Sobel-based hq mode – Altera Video and Image Processing Suite User Manual
Page 164
The motion-adaptive algorithm requires the buffering of two frames of data before it can produce any
output. The Deinterlacer always consumes the three first fields it receives at start up and after a change
of resolution without producing any output.
Note: The weave and motion-adaptive algorithms cannot handle fields of different sizes (for example,
244 lines for F0 and 243 lines for F1). Both implementations discard input fields and do not
produce an output frame until they receive a sufficient number of consecutive fields with matching
sizes.
Sobel-Based HQ Mode
The Broadcast Deinterlacer and Deinterlacer II IP cores use a new Sobel edge detection-based algorithm,
which improves image quality.
The improvement is most noticeable when upscaling Secure Digital (SD) video to High Definition (HD)
video. Other Deinterlacer II improvements include the reduction of motion shadow and high quality
output from the first frame.
Figure 12-3: Deinterlacer II High Quality Mode Zoneplate
The figure shows the difference between the Deinterlacer II HQ mode zoneplate version 12.0 and later
versions of the IP core.
Version 12.0
Version 12.1 and later
UG-VIPSUITE
2015.05.04
Sobel-Based HQ Mode
12-5
Deinterlacing IP Cores
Altera Corporation