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  2. Contourlet - Wikipedia

    en.wikipedia.org/wiki/Contourlet

    Contourlet transform double filter bank. The contourlet transform uses a double filter bank structure to get the smooth contours of images. In this double filter bank, the Laplacian pyramid (LP) is first used to capture the point discontinuities, and then a directional filter bank (DFB) is used to form those point discontinuities into linear structures.

  3. Integrative level - Wikipedia

    en.wikipedia.org/wiki/Integrative_level

    The levels concept is an intellectual framework for structuring reality. It arranges all entities, structures, and processes in the universe, or in a certain field of study, into a hierarchy, typically based on how complex their organization is. When arranged this way, each entity is three things at the same time: It is made up of parts from ...

  4. Marching squares - Wikipedia

    en.wikipedia.org/wiki/Marching_squares

    Typical applications include the contour lines on topographic maps or the generation of isobars for weather maps. Marching squares takes a similar approach to the 3D marching cubes algorithm: Process each cell in the grid independently. Calculate a cell index using comparisons of the contour level(s) with the data values at the cell corners.

  5. Hovmöller diagram - Wikipedia

    en.wikipedia.org/wiki/Hovmöller_diagram

    This Hovmöller diagram records a running mean value of outgoing longwave radiation, OLR, which produces contour-values (here shown from +3 to –3) of the Madden–Julian oscillation, MJO. Here, time increases from top to bottom, i.e., vertically, along the ordinate, or y-axis; while the oscillation contours are oriented from left to right ...

  6. Active contour model - Wikipedia

    en.wikipedia.org/wiki/Active_contour_model

    Geometric active contour, or geodesic active contour (GAC) [8] or conformal active contours [9] employs ideas from Euclidean curve shortening evolution. Contours split and merge depending on the detection of objects in the image. These models are largely inspired by level sets, and have been extensively employed in medical image computing.

  7. Otsu's method - Wikipedia

    en.wikipedia.org/wiki/Otsu's_method

    An example image thresholded using Otsu's algorithm Original image. In computer vision and image processing, Otsu's method, named after Nobuyuki Otsu (大津展之, Ōtsu Nobuyuki), is used to perform automatic image thresholding. [1]

  8. Robinson compass mask - Wikipedia

    en.wikipedia.org/wiki/Robinson_Compass_Mask

    An edge, or contour is an tiny area with neighboring distinct pixel values. The convolution of each mask with the image would create a high value output where there is a rapid change of pixel value, thus an edge point is found. All the detected edge points would line up as edges.

  9. Coot (software) - Wikipedia

    en.wikipedia.org/wiki/Coot_(software)

    The contour level controlled using the mouse wheel for easy manipulation - this provides a simple way for the user to get an idea of the 3D electron density profile without the visual clutter of multiple contour levels.