pencil-drawing:
We can see that the threshold map distributes perturbations more optimally than purely random noise, resulting in a clearer and more detailed final image. The algorithm itself is extremely simple and trivially parallelisable, requiring only a few operations per pixel.
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"A heavy hailstorm" was falling and "there was lightning" when the plane went down," a woman whose car was struck by the aircraft wreckage told the AFP news agency.
Tony Jolliffe/BBC News