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A-M baby

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Ingy döt Net 2013-04-10 21:29:02 -07:00
parent 764da6cbbb
commit db842d013d
19005 changed files with 197040 additions and 7 deletions
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Task/Hough-transform/J/hough-transform-1.j Normal file
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NB.*houghTransform v Produces a density plot of image y in hough space
NB. y is picture as an array with 1 at non-white points,
NB. x is resolution (width,height) of resulting image
houghTransform=: dyad define
'w h'=. x NB. width and height of target image
theta=. o. (%~ 0.5+i.) w NB. theta in radians from 0 to π
rho=. (4$.$. |.y) +/ .* 2 1 o./theta NB. rho for each pixel at each theta
'min max'=. (,~-) +/&.:*: $y NB. min/max possible rho
rho=. <. 0.5+ h * (rho-min) % max-min NB. Rescale rho from 0 to h and round to int
|.([: <:@(#/.~) (i.h)&,)"1&.|: rho NB. consolidate into picture
)

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Task/Hough-transform/J/hough-transform-2.j Normal file
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require 'viewmat media/platimg'
Img=: readimg jpath '~temp/pentagon.png'
viewmat 460 360 houghTransform _1 > Img