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  2. Edge detection - Wikipedia

    en.wikipedia.org/wiki/Edge_detection

    e. Edge detection includes a variety of mathematical methods that aim at identifying edges, defined as curves in a digital image at which the image brightness changes sharply or, more formally, has discontinuities. The same problem of finding discontinuities in one-dimensional signals is known as step detection and the problem of finding signal ...

  3. Figure–ground (perception) - Wikipedia

    en.wikipedia.org/wiki/Figure–ground_(perception)

    Figure–ground (perception) Figure–ground organization is a type of perceptual grouping that is a vital necessity for recognizing objects through vision. In Gestalt psychology it is known as identifying a figure from the back ground. For example, black words on a printed paper are seen as the "figure", and the white sheet as the "background ...

  4. Picture frame - Wikipedia

    en.wikipedia.org/wiki/Picture_frame

    A photo cube is a special type of picture frame, often used to show members of a family, a vacation, or a timeline of someone's life. Other styles are clip frames (not really a frame at all), box frames and shadow boxes.

  5. Canny edge detector - Wikipedia

    en.wikipedia.org/wiki/Canny_edge_detector

    Feature detection. The Canny edge detector is an edge detection operator that uses a multi-stage algorithm to detect a wide range of edges in images. It was developed by John F. Canny in 1986. Canny also produced a computational theory of edge detection explaining why the technique works.

  6. Overscan - Wikipedia

    en.wikipedia.org/wiki/Overscan

    Overscan. Overscan is a behaviour in certain television sets in which part of the input picture is cut off by the visible bounds of the screen. It exists because cathode-ray tube (CRT) television sets from the 1930s to the early 2000s were highly variable in how the video image was positioned within the borders of the screen.

  7. Comparison gallery of image scaling algorithms - Wikipedia

    en.wikipedia.org/wiki/Comparison_gallery_of...

    For magnifying computer graphics with low resolution and few colors (usually from 2 to 256 colors), better results will be achieved by pixel art scaling algorithms such as hqx or xbr. These produce sharp edges and maintain high level of detail. Unfortunately due to the standardized size of 218x80 pixels, the "Wiki" image cannot use HQ4x or ...

  8. Vignetting - Wikipedia

    en.wikipedia.org/wiki/Vignetting

    In photography and optics, vignetting ( / vɪnˈjɛtɪŋ /; vin-YET-ing) is a reduction of an image's brightness or saturation toward the periphery compared to the image center. The word vignette, from the same root as vine, originally referred to a decorative border in a book. Later, the word came to be used for a photographic portrait that is ...

  9. Edge effects - Wikipedia

    en.wikipedia.org/wiki/Edge_effects

    The width of the patch also influences diversity: an edge patch must be more pronounced than just a stark border in order to develop gradients of edge effects. Animals traveling between communities can create travel lanes along borders, which in turn increases light reaching plants along the lanes and promotes primary production. As more light ...

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