Supplementary Material Page for Our CGF Paper

Electrostatic Halftoning


Results


In this section, we present some results created with our algorithm. For larger versions of the continuous results, click the corresponding images. More results can be found in our paper.


Grey-valued Example
First, we halftoned the Trui test image from the SIPI database. We have chosen this image as it contains both sharp edges as well as smooth transitions and large homogeneous regions. Thus, one can also clearly observe the artifacts in the energetically optimal continuous result (bottom left), which are successfully removed by our jittered variant (bottom right).


Input image

Dithering result
Continuous result Jittered continuous result


Colour-valued Example
In this example, we considered an image in the CMY colour space, and treated the three channels independently.


Input image

Dithering result
Continuous result Jittered continuous result


Different Printer Resolutions
To demonstrate the adaptiveness of our algorithm to different device resolutions, we rendered the test image Leonardo da Vinci: The skull bisected and sectioned with varying dot sizes. We see that even for large dots, the structures in the image are still well visible.


Original image

Radius = 0.5px

Radius = 1.0px

Radius = 1.5px

Radius = 2.0px

Evolution of the algorithm after
different numbers of iterations.

Particle Evolution
As described in the paper, our algorithm smoothes out errors very quickly. Even though we initialised the image with random noise of the desired average grey value, the generated results already look appealing after very few iterations. We demonstrate this behaviour in a small animation that is visible to the right. The numbers below the image refer to the iteration. Please click on the thumbnail image to see a full screen video of this animation.



More experimental results and a detailed mathematical evaluation with respect to different error measures can be found in our paper.

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