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Edge Detection: Gradient operators Demo

This online edge detection app extracts contours from images or videos. It’s a free tool that works directly in a web browser. No need to download, install or register.

ONLINE PHOTO APP
Gradient operators Demo

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About This Tool

With this tool you can extract image contours from photo or illustration. You can apply some of the most popular edge detectors such as:

Configure the App

This online app has the following UI controls to help configure the edge detection filter:

  • Blur– controls the strength of a low-pass filter. The higher the value, the stronger the effect of the filter.
  • Filter – here you can switch and compare different gradient operators like Prewitt, Sobel, Schaar
  • Mode – use this drop-down to select the edge detection configuration
    • Neon or RGB – displays the contours of the image in color (three RGB components)
    • Grayscale– Extracts the image gradients in all directions (horizontal and vertical). The outline color is monochrome.
    • Thin contours – this option produce thin edges using gradient non-maximum suppression(NMS).
    • Horizontal – extracts horizontal image gradient.
    • Vertical – extracts vertical image gradient.

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