43.6.14.1 Video Scaler Description

The scaling operation is based on a vertical and horizontal resampling algorithm. The sampling rate of the original image is increased when the video is upscaled, and decreased when the video is downscaled. The horizontal and vertical low pass filters are both designed to minimize the aliasing effect.

Figure 43-26. Video Resampler Architecture

The horizontal and vertical resamplers include a 16-phase 4-tap filter equivalent to a 64-tap FIR illustrated in the figures below.

Figure 43-27. Horizontal Resampler Filter Architecture
Figure 43-28. Vertical Resampler Filter Architecture