Computer art based on quadtrees.

Related tags

Image Processing Quads
Overview

Quads

Computer art based on quadtrees.

The program targets an input image. The input image is split into four quadrants. Each quadrant is assigned an averaged color based on the colors in the input image. The quadrant with the largest error is split into its four children quadrants to refine the image. This process is repeated N times.

Web Demo

A web-based version can be seen here:

http://www.michaelfogleman.com/static/quads/

Animation

The first animation shows the natural iterative process of the algorithm.

Animation

The second animation shows a top-down, breadth-first traversal of the final quadtree.

Animation

Samples

Flower

Flower

Apple

Apple

Butterfly

Lenna

Landscape

Zebra

Fractal

Mario

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Comments
  • compatibility with python 3.4

    compatibility with python 3.4

    Added some casts to int since the result of divisions in Python 3 is automatically cast to float whereas in Python 2 they are still integers (maybe math.floor could be used but it could result in different behaviour).

    Heapq breaks in Python 3 if you push a duplicate on it i.e. push(heap, (0, 0.0, )), push(heap, (0, 0.0, )) breaks it since there is no implementation of lt in Quad. I added a counter (0, 0.0, counter, ) which ensures uniqueness of the tuple and preserves insertion order.

    opened by ghost 2
  • TypeError: integer argument expected, got float

    TypeError: integer argument expected, got float

    First of all thanks for this! I'm doing some visual experiments with this but I get the following when python main.py example.png:

    1 49.6791813927697 2 44.536910327764055 3 39.91618908262801 4 39.04791319794365 5 35.82065887614508 6 32.903885446601905 7 32.326656149530756 8 31.714629322062837 10 31.140527906852704 14 30.613942522457467 18 29.42850703649822 20 28.452708100795892 26 27.83647822542313 33 26.858610254863855 43 25.775960929898222 55 25.270909080544094 67 24.678935588991983 83 24.16320784114418 84 23.433750446224078 111 22.89905634295383 161 22.390065776883368 211 21.88953562147702 283 21.379515331465882 322 20.87853839260973 429 20.37431830735203 487 19.664391058523808 589 19.159472748595544 723 18.657686967639428 834 17.949467911576072 Traceback (most recent call last): File "main.py", line 157, in <module> main() File "main.py", line 143, in main model.render('output.png') File "main.py", line 124, in render draw.rectangle(box, quad.color) File "usr/miniconda3/lib/python3.6/site-packages/PIL/ImageDraw.py", line 245, in rectangle ink, fill = self._getink(outline, fill) File "usr/miniconda3/lib/python3.6/site-packages/PIL/ImageDraw.py", line 119, in _getink fill = self.draw.draw_ink(fill, self.mode) TypeError: integer argument expected, got float

    Do you know how to fix it? I'm on python 3.6.7. Many thanks.

    opened by huraji 1
  • Updated for Python 3

    Updated for Python 3

    Small updates so this runs in Python 3. Mainly updating print statements (including an import to retain backwards compatibility) and fixing float conversions to ints for the box drawing. Only lightly tested!

    opened by robertlayton 2
Owner
Michael Fogleman
Software Engineer at Formlabs
Michael Fogleman
GitHub http://www.michaelfogleman.com/static/quads/
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