VFX Atlas
M 016 / 18301 Edge & Featuresalgorithm output

Contour Extraction

edge & feature detection

Typeface · Spline Sans Mono

Real-world algorithm demonstration, applied to a NASA portrait.
Real-world algorithm demonstration, applied to a NASA portrait.Image: NASA / Eileen Collins · scikit-image (public domain)View source ↗

Prompt

Apply Contour Extraction, reducing the photograph to continuous pale boundary lines on a black field. Trace closed silhouettes, internal holes, and nested region borders with clean, uniformly thin strokes and slightly polygonal turns. Remove surface shading, color, and incidental texture. Keep the original subject and composition.

Paste it into LetzAI with your own image to apply the effect ↗

Identify

Light contour lines follow continuous boundary lines.

Principle

Binary mask1 and contour tracking2 provide polygonal image boundaries.

Try it out

Search for outer and inner contours.

Classification

Calculated image processing result.

Further examples · 7 images

The-figure-depicts-iris-image-after-edge-detection-making-disk-shaped-edges-apparent
02 The-figure-depicts-iris-image-after-edge-detection-making-disk-shaped-edges-apparentThe image shows extracted edges of a human eye with blue circles fitted to the iris and pupil. It illustrates the transition from raw edge detection to geometric boundary localization.Yaser Daanial Khan, Sher Afzal Khan, Farooq Ahmad, Saeed Islam · CC BY 4.0 · Wikimedia Commons
Lena stasjon Rosin
03 Lena stasjon RosinA building is depicted using dark contour lines on a white background. This high-density edge extraction follows the structural boundaries of the windows, roof, and siding.Krazykat9000 · CC BY-SA 3.0 · Wikimedia Commons
Contour Extraction, applied to “2014 Bardo, most gotycki, 10”
04 Contour Extraction, applied to “2014 Bardo, most gotycki, 10”A bridge and foliage are outlined by cyan polygonal vectors. The lines track the edges of light-colored regions against a dark background.Jacek Halicki (photo); processed for the Atlas · CC BY-SA 3.0 pl · Wikimedia Commons
Contour Extraction, applied to “Busskur i Riisskov natfoto version 2”
05 Contour Extraction, applied to “Busskur i Riisskov natfoto version 2”Bright elements within a dark bus shelter are identified by glowing blue outlines. These closed paths delineate the shapes of interior details.Villy Fink Isaksen (photo); processed for the Atlas · CC BY-SA 4.0 · Wikimedia Commons
Contour Extraction, applied to “Crocuses at BBG (43248)”
06 Contour Extraction, applied to “Crocuses at BBG (43248)”Individual crocus petals are surrounded by jagged cyan lines following their contrast boundaries. These vectors represent the extracted polygonal boundaries of the flowers.Rhododendrites (photo); processed for the Atlas · CC BY-SA 4.0 · Wikimedia Commons
Contour Extraction, applied to “360° Hohe Kugel Panorama”
07 Contour Extraction, applied to “360° Hohe Kugel Panorama”A mountain panorama features large cyan polygonal paths following the horizon and ridge lines. Smaller closed contours track distinct terrain features below.böhringer friedrich (photo); processed for the Atlas · CC BY-SA 2.5 · Wikimedia Commons