Those colleagues who have attended my Casablanca Expert webinars or been to one of my Casablanca Expert workshops know that I am a big fan of de-interlace. This process basically takes an interlaced video (the method we have been using for TV & video since it's inception) and converting it to what is essentially a progressive version.
This is important for two reasons, today's popular plasma and LCD flat-screen TVs do not show interlace material very well. And that includes computer monitors -- so videos destined for internet display/sharing should be de-interlaced (most all internet hosting websites recommend you provide them with a de-interlaced version of your video/s).
There is a function in the Casablanca video editor that allows for this and I have posted the tutorials for the process on my website: Short Process for Deinterlacing your Videos for Online Display and here (but for a different purpose) Using Movie-Mode to Improve the Look of HD Projects Headed for Blu-ray .
I have also recommended the use of computer freeware (free-software) called 'Handbrake'. This is particularly useful for folks who are ripping projects off a DVD and then uploading to the internet.
One of our colleagues - a Gold Member at CasablancaExpert.com - Ron Brookman this week turned me onto a article on the Handbrake website that details a new option they provide in their software, it's called 'Decomb'
"Decomb only deinterlaces frames that are visibly interlaced. This saves time, and makes it safe, usually, to leave it on all the time. It won't destroy the detail in progressive sources the way Deinterlace will, and should be faster than Slow or Slower". To read more about this Decomb function in Handbrake visit their website: Handbrake Decomb
And if you would like more information on the topic of Deinterlace - I recommend this page on Wikipedia: Wikipedia: Deinterlace