Detects multiple disks (coins) in an image using Hough Transform

HOUGHCIRCLES detects multiple disks (coins) in an image using Hough Transform.
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Actualizado 7 ene 2009

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HOUGHCIRCLES detects multiple disks (coins) in an image using Hough Transform. The image contains separating, touching, or overlapping disks whose centers may be in or out of the image.

Syntax
houghcircles(im, minR, maxR);
houghcircles(im, minR, maxR, thresh);
houghcircles(im, minR, maxR, thresh, delta);
circles = houghcircles(im, minR, maxR);
circles = houghcircles(im, minR, maxR, thresh);
circles = houghcircles(im, minR, maxR, thresh, delta);

Inputs:
- im: input image
- minR: minimal radius in pixels
- maxR: maximal radius in pixels
- thresh (optional): the minimal ratio of the number of detected edge pixels to 0.9 times the calculated circle perimeter (0<thresh<=1, default: 0.33)
- delta (optional): the maximal difference between two circles for them to be considered as the same one (default: 12); e.g., c1=(x1 y1 r1), c2=(x2 y2 r2), delta = |x1-x2|+|y1-y2|+|r1-r2|

Output
- circles: n-by-4 array of n circles; each circle is represented by (x y r t), where (x y), r, and t are the center coordinate, radius, and ratio of the detected portion to the circle perimeter, respectively. If the output argument is not specified, the original image will be displayed with the detected circles superimposed on it.

Citar como

Randy Tang (2024). Detects multiple disks (coins) in an image using Hough Transform (https://www.mathworks.com/matlabcentral/fileexchange/22543-detects-multiple-disks-coins-in-an-image-using-hough-transform), MATLAB Central File Exchange. Recuperado .

Compatibilidad con la versión de MATLAB
Se creó con R2007b
Compatible con cualquier versión
Compatibilidad con las plataformas
Windows macOS Linux
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Inspiración para: TACTICS Toolbox

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Versión Publicado Notas de la versión
1.5.0.0

Minor modifications according to Sven's suggestions. Thanks a lot, Sven.

1.3.0.0

Major modifications of the program.

1.2.0.0

Description of the format of function invocation is corrected.

1.1.0.0

Description about the format of function invocation is corrected.

1.0.0.0