MAN page from RedHat Other XITE-3.3-3.i386.rpm
HOUGHCIRCLE
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
houghCircle - Hough transform to detect circles
SYNTAX
houghCircle [<option>...] <inimage> <minradius> <maxradius>
DESCRIPTION
Performs a Hough transform to detect circles. The first bandof the input image
inimageis transformed to a threedimensional Hough space, a multi band image. The size of eachoutput band will be identical to the size of the input band,and the number of bands will be
maxradius-
minradius+1.
The input image should be something like a thresholded edgeimage. All pixels larger than 0 are transformed to Houghspace.
After creating the transform, the Hough space may be searchedfor local maxima. Within each band, only the largest localmaximum within a wsxwsarea is registered. Besides, onlymaxima with number of updates above ul(on a scale0.0 .. 1.0) are used. A list of these maxima may be writtento stdout, depending on the options given.
OPTIONS
- -list
- Print a list of maxima to stdout. Default: Don't.
- -tf transformFileName
- Save the transform to transformFileName.Default: Don'tsave.
- -rf reconstructionFileName
- The Hough-space maxima are used to reconstruct the image, andthe image is written to reconstructionFileName.Default: Don't reconstruct and save.
- -tt transformTitle
- Use transformTitleas title for transformed image.Default: "Hough Circle Transform".
- -rt reconstructionTitle
- Use reconstructionTitleas title for reconstructed image.Default: "Hough Circle Reconstruction".
- -ul updateLimit
- This determines the minimum number of updates for a maximumto be used. The minimum number is determined from updateLimitand the radius corresponding to the current band:
updateLimit * 2.0 * Pi * radius
Default: 0.5.
- -ws windowSize
- Default: 7.
SEE ALSO
houghLine(1),
xmovie(1)
RESTRICTIONS
Input image must have pixel type unsigned byte.
RETURN VALUE
0 when ok, positive otherwise.
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
EXAMPLES
houghCircle -ws 11 -rf circles.img \
-rt DetectedCircles input.img 5 25
ID
$Id: houghCircle.c,v 1.33 1997/01/10 16:02:06 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- OPTIONS
- SEE ALSO
- RESTRICTIONS
- RETURN VALUE
- AUTHOR
- EXAMPLES
- ID
This document was created byman2html,using the manual pages.
