Comments on: Bilinear interpolation article referenced in another language

By: Will Dwinnell

Will Dwinnell — Thu, 26 Mar 2009 12:14:44 +0000

It sounds like it's time to build that language classifier! Hmm... input: letter frequency, digram frequency output: language Any takers? Will Dwinnells last blog post..Status Update: Mar-2009

By: Vincent Tan

Vincent Tan — Sun, 22 Mar 2009 03:28:08 +0000

Hi vottini, I’m glad you found the explanation useful. Thanks for linking it.

By: vottini

vottini — Sat, 21 Mar 2009 16:36:21 +0000

Hello Vincent!

It was indeed used in a good light! I’m a student very interested on image manipulation and I was confused about the rotation of pixels, the use of sines and cosines and the float coordinates that would naturally arise from those operations. Your article explained it in a very neat way to me and I linked it to dectoplate’s entry, as I had thought on several dark ways to do that but the answer was quite simple.

As I didn’t have done this yet, thank you very much for the explanation! =)

By: Vincent Tan

Vincent Tan — Sat, 21 Mar 2009 15:08:35 +0000

Thanks for translating that, Peter. The funny thing is, I could roughly follow the code itself, but I’m totally lost on the comments… *smile* Ahhh, now it makes sense.

By: Peter P. Lupo

Peter P. Lupo — Sat, 21 Mar 2009 14:44:30 +0000

Here is the translation:
# Y to X scale change coeficient:
cm <- (m’-1)/(m-1) # vertically
cn <- (n’-1)/(n-1) # horizontally

from i to 0 step m-1
from j to 0 step n-1
# pair (i,j) mapping from Y to (i’,j’) in X
i’ <- round(i*cm) # scale and rounding (from i to i’)
j’ <- round(j*cn) # scale and rounding (from j to j’)
Y(i,j) <- X(i’,j’)
end
end
The post at Velho’s was based on this article:
http://www.cambridgeincolour.com/tutorials/image-interpolation.htm

By: Vincent Tan

Vincent Tan — Sat, 21 Mar 2009 14:23:14 +0000

Thanks O Velho!

By: O Velho

O Velho — Sat, 21 Mar 2009 13:34:57 +0000

Updating:

http://www.ovelho.com/content/bilinear-interpolation-language

You are very welcome!

Cheers

O Velhos last blog post..Re: Missão STS-119 ao vivo

By: O Velho

O Velho — Sat, 21 Mar 2009 13:15:11 +0000

Hi Vincent!

I’m the owner of the OVelho.com and I can get you in touch with the author of the post, if you want. Just drop me a message. By the way, the language is Portuguese.

Cheers.

O Velho (means “old man”)

By: Vincent Tan

Vincent Tan — Sat, 21 Mar 2009 05:52:03 +0000

Hey thanks! I gave up trying to figure out the source language after 20 minutes…

By: Anonymous

Anonymous — Fri, 20 Mar 2009 23:04:46 +0000

It’s Portuguese, which I don’t speak, but a Google Translated version is here: http://translate.google.co.uk/translate?u=http%3A%2F%2Fwww.ovelho.com%2Fcontent%2Fredimensionamento-simples-de-imagem-e-outras-transforma%25C3%25A7%25C3%25B5es&sl=pt&tl=en&hl=en&ie=UTF-8

(The title is “Simple image resizing and other processing”)