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Droste Effect Tool

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Droste Effect Tool

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13 May 2009 (Updated )

Apply the Droste Effect to an image using a GUI or function call.

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Description

Apply the Droste Effect to an image using a GUI or function call.

The Droste Effect is when an image recursively includes itself. The basic method is to insert a scaled copy of the image, but more interesting results can be achieved via conformal mapping.

The GUI can load an image, set a rectangular region for the effect, apply the Droste Effect, adjust parameters of the effect, and save the final image back to disk. The GUI uses droste_effect.m, which is a stand alone function for applying the Droste Effect.

img_out = droste_effect(img, reg) will apply the Droste Effect to matrix img within the region specified by reg. The img matrix can be 2-D or 3-D, corresponding to a grayscale or RGB image. The reg vector specifies [left, top, width, height] in pixels.

img_out = droste_effect(img, reg, 'p1', v1, 'p2', v2, ...) specifies optional parameters (pn) and values (vn) associated with the Droste Effect. The table below describes these parameters.

Parameters
    zoom: Scale. Default = 1.0x.
    hshift: Horizontal shift, normalized [0...1]. Default = 0.
    vshift: Vertical shift, normalized [0...1]. Default = 0.
    rotate: Rotate. Default = 0 degrees.
    nspiral: Number of spirals. Default = 1.
    ncopies: Number of copies of image per spiral rotation. Default = 1.
    maxrecur: Max recursion allowed to compute output. Default = 10.
    width: Width of output in pixels. Default = same resolution as input.
    aafactor: Anti-aliasing factor. Default = 1, higher = smoother. (0 = disable)

Example:
    load penny
    reg = [45 45 40 40];
    img_out = droste_effect(P, reg, 'width', 400);
    figure
    imshow(round(img_out),copper(256))

Running out of memory? Reduce the size of the input image before using this GUI for function.

Required Products Image Processing Toolbox
MATLAB release MATLAB 7.6 (R2008a)
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Comments and Ratings (1)
16 May 2009 Alan Brooks

Very interesting and fun.

Updates
13 May 2009

Show GUI screenshot in the published m-file.

13 May 2009

Fix spelling typo

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