Confusing Stuff

Related Links...

Interlace

Progressive Scan
Progressive...

Great Definition of Interlacing (thanks for the link Justin)

Comments

[Rupert]

This is incredibly clear and fluent. I've tried to explain all this to people quite a few times... and mostly failed, or fumbled, or tied myself in knots. Good work!

[Jem Schofield]

Thanks Rupert.

Your site is cool.

-Jem

[Filipe Varela]

A good example of progressive scan on the DSLRs would be the rolling shutter (aka jello effect), correct?

-F

[Jem Schofield]

Not completely Filipe. I would separate progressive from rolling shutter even though there are parallels to how the image is generated. Rolling shutter is not what creates progressive content even though it is used in current CMOS based cameras.

-Jem

[Filipe Varela]

That's what I meant by the rolling shutter being a good example of progressive scanning — it illustrates how the sensor captures the image, hence the so-called "jello effect".
Or, to put it another way, in interlaced capture the jello effect wouldn't be so noticeable (if at all), due to how the image is captured.

Am I wrong?

-F

[Jem Schofield]

Hey Filipe,

I see where you're coming from but I don't think it's a great analogy and it can potentially confuse an already confusing subject even more. To equate progressive with rolling shutter can get very dicey.

But, I do get what you're saying.

-Jem

[Filipe Varela]

Just wanted to clear that up, thanks Jem!

-F

[doublejnyc]

Here's another very tight, simple description of interlace and why it was created in the first place.

https://docs.google.com/document/edit?id=1_Ef22GuAnrPQKGzz_-4jp0FWlXY0UXXSRGnKIagG3BQ&hl=en&pli=1#

This is a re-printed blog post from http://www.dvcreators.net/interlacing/ but I made this google doc because for some reason the pictures weren't showing up.