Image-Processing

Image dithering (2): error diffusion

Jul 8, 2023 · 4 min read · julia image-processing ·

A totally different approach to dithering is error diffusion. Here, the image is scanned pixel by pixel. Each pixel is thresholded t0 1 or 0 depending on whether the pixel value is greater than 0.5 or not, and the error - the difference between the pixel value and its threshold - is diffuse across neighbouring pixels. …

Image dithering (1): half toning

Jul 7, 2023 · 2 min read · julia image-processing ·

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Image dithering, also known as half-toning, is a method for reducing the number of colours in an image, while at the same time trying to retain as much of its “look and feel” as possible. Originally this was required for newspaper printing, where no shades of grey were possible, and only black and white could be …

Poles of inaccessibility

Dec 8, 2019 · 4 min read · image-processing julia ·

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Just recently there was a news item about a solo explorer being the first Australian to reach the Antarctic “Pole of Inaccessibility”. Such a Pole is usually defined as that place on a continent that is furthest from the sea. The South Pole is about 1300km from the nearest open sea, and can be reached by specially …