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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. Frei-Chen operator - Wikipedia

    en.wikipedia.org/wiki/Frei-Chen_operator

    The image is convoled with each of the kernel. Thus, 9 results are obtained. Vectors ,... are used for edge subspace identification. Hence numerator in the formula will be = (). Similarly, for line subspace identification, the numerator will be = (). . Using formula, we compute , if it is above a certain threshold , we say that an edge is detected in the image sub-area. . Example comparisons ...

  4. 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.

  5. 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 ...

  6. Generalised Hough transform - Wikipedia

    en.wikipedia.org/wiki/Generalised_Hough_transform

    The Hough transform was initially developed to detect analytically defined shapes (e.g., line, circle, ellipse etc.). In these cases, we have knowledge of the shape and aim to find out its location and orientation in the image. This modification enables the Hough transform to be used to detect an arbitrary object described with its model.

  7. Download, install, or uninstall AOL Desktop Gold - AOL Help

    help.aol.com/articles/aol-desktop-downloading...

    1. Search your inbox for the subject line 'Get Started with AOL Desktop Gold'. 2. Open the email. 3. Click Download AOL Desktop Gold or Update Now. 4. Navigate to your Downloads folder and click Save. 5. Follow the installation steps listed below.

  8. 'We can work with him': Abortion opponents tentatively ... - AOL

    www.aol.com/him-abortion-opponents-tentatively...

    “I was able to kill Roe v. Wade,” Trump wrote in a Truth Social post last May. He has repeatedly touted his judicial appointments that put a majority conservative Supreme Court bench in place. ...

  9. Corner detection - Wikipedia

    en.wikipedia.org/wiki/Corner_detection

    Corner detection is an approach used within computer vision systems to extract certain kinds of features and infer the contents of an image. Corner detection is frequently used in motion detection, image registration, video tracking, image mosaicing, panorama stitching, 3D reconstruction and object recognition.