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Droste Effect Tool

version 1.2 (1.59 MB) by

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

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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.

Comments and Ratings (1)

Alan Brooks

Very interesting and fun.

Updates

1.2

Fix spelling typo

1.1

Show GUI screenshot in the published m-file.

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MATLAB 7.6 (R2008a)

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