View source for shift

{{DavinciWiki_Function|
Shift image in x and y
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Arguments: An image and pixel shift values
 
Return Value: A new image, larger in each dimension by shift values with shifted data
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[[Syntax]]: shift(image, delta_x, delta_y)
 
'image' - An image needing lateral pixel shifting
 
'delta_x' - Number of pixels to shift in x
 
'delta_y' - Number of pixels to shift in y
 
  delta x and y are relative to first band
  x:  negative values shift each band successively more to LEFT relative to first band
      positive values shift each band successively more to RIGHT relative to first band
 
      del_x is typically negative for daytime (descending node) image
 
  y:  negative values shift each band successively more UP relative to first band
      positive values shift each band successively more DOWN  relative to first band
 
      del_y should be 0 in the ideal case of perfect TDI and S/C velocity
 
  typical values are -2, -2 to -2,0 for equatorial images; del_x should be smaller at high latitudes
 
  makes output array larger than input array so no data are lost
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 dv> a
 600x600x3 array of byte, bip format [1,080,000 bytes]
 
 dv> b&#61;shift(a,10,10)
 band &#61; 1:    output image:  start x &#61; 1 end x &#61; 600   start y &#61; 1 end y &#61; 600
 band &#61; 2:    output image:  start x &#61; 11 end x &#61; 610   start y &#61; 11 end y &#61; 610
 band &#61; 3:    output image:  start x &#61; 21 end x &#61; 620   start y &#61; 21 end y &#61; 620
 620x620x3 array of byte, bip format [1,153,200 bytes]
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[[Image:unfiltered.png|300px]] [[Image:shift.png|310px]]
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*[[format]]
*[[int]]
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*data_manipulation
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}}
[[category:Functions]]
[[category:User Defined Functions]]
[[category:Matrix]]