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BUILT-IN MATHEMATICA SYMBOL
ImageLines[image]
finds line segments in image and returns the coordinates of their endpoints.
ImageLines[image, t]
uses the threshold t for selecting image lines.
ImageLines[image, t, d]
uses the parameter d to control the distinctness of the detected lines.
Details and Options
- ImageLines returns a list of line segments
where the 
are expressed in the standard image coordinates 
. - ImageLines[image, t] finds lines in the image whose normalized strength is larger than the specified threshold t.
- In ImageLines[image, t, d], the parameter d controls how close lines are suppressed. If the value is set to zero, all detected lines are returned. With d set to
, only the strongest line may be returned. - By default, ImageLines computes lines based on the Hough transform of the image, using the setting Method->"Hough".
- Lines are detected by iteratively selecting the strongest peaks in the Hough transform. Using the distinctness parameter, peaks that are within a rectangular range from the already selected peaks are excluded from the set of line candidates.
- With Method->"RANSAC", lines are detected using random sampling. For each sampling, pixels that are within a distance specified by the distinctness parameter d are used for computing the strength of the line. The pixels on the selected line are not used in the following iterations.
- By default, ImageLines returns lines that span from border to border. With a setting "Segmented"->True, detected lines may be divided into smaller segments.
- ImageLines accepts a MaxFeatures option. The default setting is MaxFeatures->All. With a setting MaxFeatures->n, at most n lines with largest normalized strength are returned.
New in 8 | Last modified in 9
