| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Telephone System Quotes for Cat Soft LLC; Owen Jones on Twitter; Telephone System Quotes for Cat Soft LLC; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; NSA Hacked; Call Center Services for Cat Soft LLC; Very Good LRB Article on Brexit; Nussbaum on Anger; Credit Card Processing for Cat Soft LLC; Discover new movies on demand in our online cinema; Tasting; Credit Card Processing for Cat Soft LLC; Apple + Kiwi Jam; Hit Me; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; Call Center Services for Cat Soft LLC; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; Payroll Service Quotes for Cat Soft LLC; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result; Your diamond is a beaten up mess; Maths Books; Good Bike Route from Providencia / Las Condes to Panul\; Iain Pears (Author of Complex Plots); Plum Jam; Excellent; More Recently; For a moment I forgot StackOverflow sucked; A Few Weeks On...; Chilean Book Recommendations; How To Write Shared Libraries; Jenny Erpenbeck (Author); Dijkstra, Coins, Tables; Python libraries error on OpenSuse; Deserving Trump; And Smugness; McCloskey Economics Trilogy; cmocka - Mocks for C; Concept Creep (Americans); Futhark - OpenCL Language; Moved / Gone; Fan and USB issues; Burgers in Santiago; The Origin of Icosahedral Symmetry in Viruses; autoenum on PyPI; Jars Explains; Tomato Chutney v3; REST; US Elections and Gender: 24 Point Swing; PPPoE on OpenSuse Leap 42.1; SuperMicro X10SDV-TLN4F/F with Opensuse Leap 42.1; Big Data AI Could Be Very Bad Indeed....; Cornering; Postcapitalism (Paul Mason); Black Science Fiction; Git is not a CDN; Mining of Massive Data Sets; Rachel Kaadzi Ghansah; How great republics meet their end; Raspberry, Strawberry and Banana Jam; Interesting Dead Areas of Math; Later Taste; For Sale; Death By Bean; It's Good!; Tomato Chutney v2; Time ATAC MX 2 Pedals - First Impressions; Online Chilean Crafts; Intellectual Variety; Taste + Texture; Time Invariance and Gauge Symmetry; Jodorowsky

© 2006-2015 Andrew Cooke (site) / post authors (content).

Functional Images Summary

From: "andrew cooke" <andrew@...>

Date: Fri, 20 Jan 2006 08:32:16 -0300 (CLST)

---------------------------- Original Message ----------------------------
Subject: Functional Images [Was: [plt-scheme] newbie - plotting points]
From:    "andrew cooke" <andrew@...
Date:    Fri, January 20, 2006 08:17
To:      "scheme" <plt-scheme@...
--------------------------------------------------------------------------

If you're interested in a more functional paradigm for images you might
look at Pan - http://conal.net/pan/

The idea is to represent images as functions.

Pan uses C code in places for speed - it's implemented as a language
embedded in Hakell that's somehow compiled via C (I can't remember the
details any more but there are papers at http://conal.net/pan/papers.htm)

I wrote a pure Haskell version because I wasn't that concerned about speed
and was frustrated with the limitations of the embeddded language.  It's
called Pancito and is available here -
http://www.acooke.org/jara/pancito/index.html  Someone once put some
effort into speeding it up (using unboxed types, mutable arrays), but they
never gave me the code, unfortunately.

You can get an idea of the code from the literate source, which is also
the manual - http://www.acooke.org/jara/pancito/Pancito2.pdf

Some images of mine are here (not all use Pancito) -
http://www.acooke.org/pancito/intnleng/index.html

The style of image you get with this approach is very different to DBN.
DBN places much more emphasis on lines / boxes (things with hard edges);
with functional images it's very difficult to get a line, much easier to
vary things smoothly across the surface of the image.

For example this image - http://www.acooke.org/pancito/intnleng/paper.html
- is defined using a function that shades a surface either side of a "fold
line"; the function is also a function of position/angle (of the fold).
So the final image is defined by currying that function with random fold
points and then composing those curried functions to get a final transform
for the whole surface.  Computing that image at 6000x6000 took several
days on a 2MHz desktop a few years ago.

The lines in an image like this -
http://www.acooke.org/pancito/intnleng/migraine.html - come from the
underlying plane that is transformed.  So that image is the result of
applying many functions to a plane that originally contained a single
(hard-edged) circle.

Since I'm already in an orgy of self links, here are the details of what I
ended up doing in scheme thanks to the help from people here (not pretty!
- just exploring numeric values)
http://www.acooke.org/cgi/photo.py?start=fib-fractal
http://www.acooke.org/cgi/photo.py?start=fib-curves

Andrew

Comment on this post