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  2. Line detection - Wikipedia

    en.wikipedia.org/wiki/Line_detection

    The code was used to detect only the vertical lines in an image using Matlab and the result is below. The original image is the one on the top and the result is below it. As can be seen on the picture on the right, only the vertical lines were detected Original Image line detection

  3. Lambda2 method - Wikipedia

    en.wikipedia.org/wiki/Lambda2_method

    The Lambda2 method, or Lambda2 vortex criterion, is a vortex core line detection algorithm that can adequately identify vortices from a three-dimensional fluid velocity field. [1] The Lambda2 method is Galilean invariant , which means it produces the same results when a uniform velocity field is added to the existing velocity field or when the ...

  4. Hough transform - Wikipedia

    en.wikipedia.org/wiki/Hough_transform

    scikit-image Hough-transform for line, circle and ellipse, implemented in Python. Hough transform based on wavelet filtering, to detect a circle of a particular radius. (Matlab code.) Hough transform for lines using MATLAB Archived 2014-04-13 at the Wayback Machine; Hough transform for circles in MATLAB; KHT – C++ source code.

  5. Hadamard code - Wikipedia

    en.wikipedia.org/wiki/Hadamard_code

    Hadamard codes are obtained from an n-by-n Hadamard matrix H. In particular, the 2n codewords of the code are the rows of H and the rows of −H. To obtain a code over the alphabet {0,1}, the mapping −1 ↦ 1, 1 ↦ 0, or, equivalently, x ↦ (1 − x)/2, is applied to the matrix elements.

  6. Chessboard detection - Wikipedia

    en.wikipedia.org/wiki/Chessboard_detection

    Download QR code; Print/export ... one expects that line detection algorithms should successfully detect these lines in practice. ... The following MATLAB code ...

  7. Randomized Hough transform - Wikipedia

    en.wikipedia.org/wiki/Randomized_Hough_Transform

    Hough transforms are techniques for object detection, a critical step in many implementations of computer vision, or data mining from images. Specifically, the Randomized Hough transform is a probabilistic variant to the classical Hough transform, and is commonly used to detect curves (straight line, circle, ellipse, etc.) [1] The basic idea of Hough transform (HT) is to implement a voting ...

  8. Robinson compass mask - Wikipedia

    en.wikipedia.org/wiki/Robinson_Compass_Mask

    In image processing, a Robinson compass mask is a type of compass mask used for edge detection. It has eight major compass orientations, [ 1 ] each will extract the edges in respect to its direction. A combined use of compass masks of different directions could detect the edges from different angles.

  9. Category:Line codes - Wikipedia

    en.wikipedia.org/wiki/Category:Line_codes

    Download QR code; Print/export Download as PDF; Printable version; ... Pages in category "Line codes" The following 46 pages are in this category, out of 46 total.