Bicubic Interpolation - Computerphile

Scaling images is usually smoother using bicubic interpolation. Dr Mike Pound explains why.



This video was filmed and edited by Sean Riley.

[whuzzzup]

We need a video on the "CSI: Crime Scene Investigation" interpolation.

[vladqoq]

OMG, i just love the way how Dr Mike Pound sounds.
Computerphile, please, make more videos with Dr.Mike Pound.
HE IS AWESOME.

[javierbg]

Dr Mike Pound is probably the best communicator in the channel. Always happy to see a new video featuring him!

[TheArcher]

I really dig this guy. He's got humour and a clear way of explaining stuff. more please! :)

[TimeHarmonic]

I really like the videos with Dr Mike Pound. They are the best

[budkin]

I could watch Dr. Mike explain literally anything and find it engaging.

[yandodov]

I like your videos with Mike. Make some more videos with Mike, please. Thanks!

[KnownNever]

Nothing like a cup of Dr. Mike to start the morning off right... great vid as always!

[lawrencedoliveiro]

7:17 If you operate in high-dynamic range formats like EXR, which has floating-point pixel components, you have room to both overshoot and undershoot. Then you can renormalize the image using a filmic response curve or something without clipping.

[ScienceSeance]

What a great teacher. Pint deserved for this dude.

[lawrencedoliveiro]

Yes, worth talking about Lanczos. Also worth talking about the general principle of image/signal reconstruction using the sinc function, because all resampling techniques are basically shortcuts to avoid the high computational expense of sinc.

[WIImotionmasher]

I'd like to say, that relatively new effect in these videos, where the piece of paper is distorted to look like a top down view, is cool.

[logicalfundy]

"auto" most likely changes the resizing algorithm being used when sizing up vs sizing down, or when resizing is minimal (1.1 times) vs when it is a large change (5 times or so).

[eck]

I'm impressed of how much this man knows. Every time i'm googling some complex stuff explanation, i see his tutorials in the results. :D

[TheMasonX]

I use Hermite interpolation (x * x * (3 - 2x)) in my games all the time. It eases in and out evenly near 0 and 1 cheaply, and makes blending look so much better in most circumstances

[NorbertHarrer]

Ahh, I love it when Spiderman does computer science :-D

[lawrencedoliveiro]

2:15 Originally, a “spline” was an actual rod made of some flexible material, that a draughtsperson would use to draw curves on paper with a pencil. Then the term was carried over to mathematical operations for doing the same sort of thing.

[Nautilus]

I didn't think I'd be happy to come across a bicubic interpolation video today, but here we are.

[britishcuisineasmr]

What is also interesting with respect to this technique is that CNN-based superresolution models perfrom *significantly* better if the training input has been downscaled using bicubic interpolation rather than cruder methods.

[SomethingUnreal]

Eventually, this series of interpolation videos will come a full circle back to convolutional neural networks when it reaches the Waifu2x upscaling software.