Image convolution: Difference between revisions
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m (→{{header|J}}) |
m (→{{header|J}}: use lang block for syntax highlighting and add whitespace to help with reading) |
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<lang J>NB. pad the edges of an array with border pixels |
<lang J>NB. pad the edges of an array with border pixels |
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NB. (increasing the first two dimensions by 1 less than the kernel size) |
NB. (increasing the first two dimensions by 1 less than the kernel size) |
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pad=:adverb define |
pad=: adverb define |
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'a b'=. (<.,.>.) 0.5 0.5 p. $m |
'a b'=. (<. ,. >.) 0.5 0.5 p. $m |
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a"_`(0,]-1:)`(#1:)}~&# # b"_`(0,]-1:)`(#1:)}~&(1{$) #"1 ] |
a"_`(0 , ] - 1:)`(# 1:)}~&# # b"_`(0 , ] - 1:)`(# 1:)}~&(1 { $) #"1 ] |
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) |
) |
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kernel_filter=:adverb define |
kernel_filter=: adverb define |
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($m)+/ .*&(,m)&(,/);._3 m pad |
($m)+/ .*&(,m)&(,/);._3 m pad |
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)</lang> |
)</lang> |
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Example use: |
Example use: |
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NB. kernels borrowed from C and TCL implementations |
<lang J> NB. kernels borrowed from C and TCL implementations |
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sharpen_kernel=: _1+10*4=i.3 3 |
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blur_kernel=: 3 3$%9 |
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emboss_kernel=: _2 _1 0,_1 1 1,:0 1 2 |
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sobel_emboss_kernel=: _1 _2 _1,0,:1 2 1 |
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'blurred.ppm' writeppm~ blur_kernel kernel_filter readppm 'original.ppm'</lang> |
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=={{header|Java}}== |
=={{header|Java}}== |
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