Real-world algorithm demonstration, applied to a NASA portrait.Image: NASA / Eileen Collins · scikit-image (public domain)View source ↗
Prompt
Apply Roberts Cross, producing a dark monochrome edge map with extremely fine, pixel-sharp traces of local contrast. Emphasize diagonal transitions, tiny angular details, and lightly speckled texture noise. Keep boundaries narrow and somewhat fragmented, without broad halos or smoothing. Keep the original subject and composition.
02050817-N-3488C-028-RobertsCrossA fighter jet is shown processed with the Roberts Cross edge detection algorithm. The result displays thin, high-contrast outlines against a black background, emphasizing sharp intensity changes.R6MaY89 · Public domain · Wikimedia Commons03Roberts cross stärkeArchitecture is shown with inverted Roberts Cross processing. The thin dark lines on a white field highlight the algorithm's sensitivity to fine diagonal contrast details.user Pale blue dot, real name, Ali Imran, de:Benutzer:Drill · CC BY-SA 3.0 · Wikimedia Commons04Fruits edgeAn image of fruit processed with the Roberts Cross edge detector. The result shows very fine, white intensity outlines on a black background, capturing the high-frequency diagonal contrast edges characteristic of the 2x2 operator.Sean121067 · CC0 · Wikimedia Commons05Valve RobertsA processed grayscale image showing thin, light outlines on a black background. The output demonstrates the Roberts Cross edge detection operator, highlighting contrast boundaries in a mechanical subject using 2x2 diagonal differences.Simpsons contributor · CC BY-SA 3.0 · Wikimedia Commons06AI illustration: A brutalist building is shown with fine, pixelated outlinesA brutalist building is shown with fine, pixelated outlines. The edges appear noisy and thin, typical of the discrete 2x2 gradient calculation which captures high-frequency diagonal details without the smoothing found in Canny filters.Illustration generated for the Atlas (AI)07AI illustration: A monochrome portrait displays extremely fine, thin edge detectionA monochrome portrait displays extremely fine, thin edge detection. The discrete, grainy lines on the face and beard demonstrate the noisy, localized contrast measurement of the 2x2 Roberts operator.Illustration generated for the Atlas (AI)
