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  2. Line detection - Wikipedia

    en.wikipedia.org/wiki/Line_detection

    The Hough transform [3] can be used to detect lines and the output is a parametric description of the lines in an image, for example ρ = r cos(θ) + c sin(θ). [1] If there is a line in a row and column based image space, it can be defined ρ, the distance from the origin to the line along a perpendicular to the line, and θ, the angle of the perpendicular projection from the origin to the ...

  3. Generalised Hough transform - Wikipedia

    en.wikipedia.org/wiki/Generalised_Hough_transform

    (2) Draw a line from the reference point to the boundary (3) Compute ɸ (4) Store the reference point (x c, y c) as a function of ɸ in R(ɸ) table. Detection: (0) Convert the sample shape image into an edge image using any edge detecting algorithm like Canny edge detector. (1) Initialize the Accumulator table: A[x cmin. . . x cmax][y cmin ...

  4. Chessboard detection - Wikipedia

    en.wikipedia.org/wiki/Chessboard_detection

    The grid structure of a chessboard naturally defines two sets of parallel lines in an image of it. Therefore, one expects that line detection algorithms should successfully detect these lines in practice. Indeed, the following figure demonstrates Hough transform-based line detection applied to a perspective-transformed chessboard image. Clearly ...

  5. Hough transform - Wikipedia

    en.wikipedia.org/wiki/Hough_transform

    Use of the Hough transform on noisy images is a very delicate matter and generally, a denoising stage must be used before. In the case where the image is corrupted by speckle, as is the case in radar images, the Radon transform is sometimes preferred to detect lines, because it attenuates the noise through summation.

  6. Comparison of raster-to-vector conversion software - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_raster-to...

    Free GPL-2.0-or-later: Windows, macOS, Linux ImageTracer: András Jankovics 2015 2020 (version 1.2.6) Free Public domain Cross-platform (platforms that can run JavaScript or Java) Potrace: Peter Selinger 2001 2019 (version 1.16) Free GPL-2.0-or-later: Cross-platform, Windows and POSIX: Scan2CAD: Avia Systems 1997 2022 (version 10.4.13)

  7. Outline of object recognition - Wikipedia

    en.wikipedia.org/wiki/Outline_of_object_recognition

    Object recognition – technology in the field of computer vision for finding and identifying objects in an image or video sequence. Humans recognize a multitude of objects in images with little effort, despite the fact that the image of the objects may vary somewhat in different view points, in many different sizes and scales or even when they are translated or rotated.

  8. Canny edge detector - Wikipedia

    en.wikipedia.org/wiki/Canny_edge_detector

    An edge in an image may point in a variety of directions, so the Canny algorithm uses four filters to detect horizontal, vertical and diagonal edges in the blurred image. The edge detection operator (such as Roberts, Prewitt, or Sobel) returns a value for the first derivative in the horizontal direction (G x) and the vertical direction (G y ...

  9. ImageJ - Wikipedia

    en.wikipedia.org/wiki/ImageJ

    Fiji (software), an image processing package based on ImageJ; KNIME - an open-source data mining environment supporting image analysis developed in close collaboration with the next generation of ImageJ; List of free and open-source software packages; Microscope image processing

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