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lbb resampler comments

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This commit is contained in:
Nicolas Robidoux 2010-03-24 19:11:39 +00:00
parent de591a311f
commit ad2ba14d16
1 changed files with 9 additions and 1 deletions
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10
libvips/resample/lbb.cpp
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@ -92,7 +92,15 @@
*
* Instead of forcing the reconstructed surface to lie between two
* GLOBALLY defined planes, LBB constrains one patch at a time to lie
* between the local min and max.
* between local min and max. It does so by constraining the
* derivatives (x, y and cross) at each input pixel location so that
* if the constraint was applied everywhere the surface would fit
* between the min and max of the values at the 9 closest pixel
* locations. Because this is done with each of the four pixel
* locations which define the bicubic patch constrains the
* reconstructed surface between the min and max of the values at the
* 16 closest values pixel locations (each corner defines its own 9x9
* subgroup of the 4x4 stencil).
*/
#ifdef HAVE_CONFIG_H