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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. 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. Circle Hough Transform - Wikipedia

    en.wikipedia.org/wiki/Circle_Hough_Transform

    Consider 4 points on a circle in the original image (left). The circle Hough transform is shown in the right. Note that the radius is assumed to be known. For each (x,y) of the four points (white points) in the original image, it can define a circle in the Hough parameter space centered at (x, y) with radius r.

  7. Remove or temporarily hide ads in AOL Mail - AOL Help

    help.aol.com/articles/ad-free-aol-mail

    Ad blockers insert code to block ads, which can negatively impact email performance and break functionality (such as accidentally hiding messages). If we detect you're using ad blocking software, we may prompt you with some options, but you can unblock AOL Mail at any time to avoid issues.

  8. Can Weight Loss Drugs Make You Boring? Doctors Explain ...

    www.aol.com/weight-loss-drugs-boring-doctors...

    Here's what doctors thing is behind personality changes caused by Ozempic and other GLP-1s and what you can do about it.

  9. 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 ...