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Assistant District Attorney Victoria Notaro said video showed Coulibaly throwing a snowball that struck Officer Nicholas Johnson in the face, but prosecutors did not find evidence showing that the officer’s injuries were caused “directly by this defendant’s conduct.”
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Another way to approach dithering is to analyse the input image in order to make informed decisions about how best to perturb pixel values prior to quantisation. Error-diffusion dithering does this by sequentially taking the quantisation error for the current pixel (the difference between the input value and the quantised value) and distributing it to surrounding pixels in variable proportions according to a diffusion kernel . The result is that input pixel values are perturbed just enough to compensate for the error introduced by previous pixels.