DSLR Video and Aliasing Artifacts

If you are shooting video with one of the hot new DSLRs, you are probably aware of the aliasing issues found in some of your footage. If not yet, you will at some point. Just keep shooting, it will show up. Fine detail aliasing has always been an issue for any camera system, but it’s particularly prevalent in DSLRs as they lack an Optical Low Pass Filter (OLPF) that is specifically tuned for video. In the case of the 5D & 7D, engineers at Canon have also chosen to sample a limited number of lines from the image sensor to downsample to 1080p. This is quick solution, but not the highest quality way of doing things; it creates aliasing image artifacts, and reportedly limits the resolution of the cameras at around 720p. It’s almost as if these tools were primarily designed as still cameras! How strange. At any rate, I’ve learned to warn my clients before interview shoots not to wear shirts with fine detail patterns, as they will moiré faster than you can say “how the hell do you pronounce that word?”

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