added slash to resample/Makefile.am and added inactive speedy options to lbb.cpp and nohalo.cpp
This commit is contained in:
Nicolas Robidoux
parent
771dcdbb1a
commit
419457b369
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@ -12,7 +12,7 @@ libresample_la_SOURCES = \
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im_rightshift_size.c \
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transform.c \
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resample_dispatch.c \
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bicubic.cpp
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bicubic.cpp \
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nohalo.cpp \
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lbb.cpp \
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snohalo.cpp \
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@ -44,6 +44,29 @@
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* (20-61098).
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*/
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/*
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* LBB has two versions:
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*
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* A "soft" version, which shows a little less staircasing and a
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* little more haloing, and which is a little more expensive to
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* compute. We recommend this as the default.
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*
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* A "sharp" version, which shows a little more staircasing and a
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* little less haloing, and which is a little cheaper (it uses 6
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* less comparisons and 12 less "? :").
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*
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* The only difference between the two is that the "soft" versions
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* uses local minima and maxima computed over 3x3 square blocks, and
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* the "sharp" version uses local minima and maxima computed over 3x3
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* crosses.
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*
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* If you want to use the "sharp" (cheaper) version, uncomment the
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* following three pre-processor code lines:
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*/
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// #ifndef __LBB_CHEAP_H__
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// #define __LBB_CHEAP_H__
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// #endif
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/*
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* LBB (Locally Bounded Bicubic) is a high quality nonlinear variant
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* of Catmull-Rom. Images resampled with LBB have much smaller halos
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@ -119,6 +142,9 @@
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* own 3x3 subgroup of the 4x4 stencil. Consequently, the surface is
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* necessarily above the minimum of the four minima, which happens to
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* be the minimum over the 4x4. Similarly with the maxima.)
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*
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* The above paragraph described the "soft" version of LBB. The
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* "sharp" version is similar.
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*/
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#ifdef HAVE_CONFIG_H
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@ -226,11 +252,47 @@ lbbicubic( const double c00,
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* location.
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*/
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#if defined (__LBB_CHEAP_H__)
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/*
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* Computation of the four min and four max over 3x3 input data
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* sub-crosses of the 4x4 input stencil, performed with only 22
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* comparisons and 28 "? :". If you can figure out how to do this
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* more efficiently, let us know.
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*/
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const double m1 = (dos_two <= dos_thr) ? dos_two : dos_thr ;
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const double M1 = (dos_two <= dos_thr) ? dos_thr : dos_two ;
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const double m2 = (tre_two <= tre_thr) ? tre_two : tre_thr ;
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const double M2 = (tre_two <= tre_thr) ? tre_thr : tre_two ;
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const double m3 = (uno_two <= dos_one) ? uno_two : dos_one ;
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const double M3 = (uno_two <= dos_one) ? dos_one : uno_two ;
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const double m4 = (uno_thr <= dos_fou) ? uno_thr : dos_fou ;
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const double M4 = (uno_thr <= dos_fou) ? dos_fou : uno_thr ;
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const double m5 = (tre_one <= qua_two) ? tre_one : qua_two ;
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const double M5 = (tre_one <= qua_two) ? qua_two : tre_one ;
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const double m6 = (tre_fou <= qua_thr) ? tre_fou : qua_thr ;
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const double M6 = (tre_fou <= qua_thr) ? qua_thr : tre_fou ;
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const double m7 = LBB_MIN( m1, tre_two );
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const double M7 = LBB_MAX( M1, tre_two );
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const double m8 = LBB_MIN( m1, tre_thr );
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const double M8 = LBB_MAX( M1, tre_thr );
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const double m9 = LBB_MIN( m2, dos_two );
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const double M9 = LBB_MAX( M2, dos_two );
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const double m10 = LBB_MIN( m2, dos_thr );
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const double M10 = LBB_MAX( M2, dos_thr );
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const double min00 = LBB_MIN( m7, m3 );
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const double max00 = LBB_MAX( M7, M3 );
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const double min10 = LBB_MIN( m8, m4 );
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const double max10 = LBB_MAX( M8, M4 );
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const double min01 = LBB_MIN( m9, m5 );
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const double max01 = LBB_MAX( M9, M5 );
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const double min11 = LBB_MIN( m10, m6 );
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const double max11 = LBB_MAX( M10, M6 );
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#else
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/*
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* Computation of the four min and four max over 3x3 input data
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* sub-blocks of the 4x4 input stencil, performed with only 28
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* comparisons. If you can figure how to do this more efficiently,
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* let us know.
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* comparisons and 34 "? :". If you can figure how to do this more
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* efficiently, let us know.
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*/
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const double m1 = (dos_two <= dos_thr) ? dos_two : dos_thr ;
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const double M1 = (dos_two <= dos_thr) ? dos_thr : dos_two ;
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@ -266,6 +328,8 @@ lbbicubic( const double c00,
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const double max10 = LBB_MAX( M8, M12 );
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const double min11 = LBB_MIN( m9, m13 );
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const double max11 = LBB_MAX( M9, M13 );
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#endif
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/*
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* The remainder of the "per channel" computation involves the
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* computation of:
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@ -74,6 +74,34 @@
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* N. Robidoux, A. Turcotte, J. Cupitt, M. Gong and K. Martinez.
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*/
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/*
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* Nohalo with LBB as finishing scheme has two versions, which are
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* only different in the way LBB is implemented:
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*
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* A "soft" version, which shows a little less staircasing and a
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* little more haloing, and which is a little more expensive to
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* compute. We recommend this as the default.
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*
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* A "sharp" version, which shows a little more staircasing and a
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* little less haloing, and which is a little cheaper (it uses 6
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* less comparisons and 12 less "? :").
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*
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* The only difference between the two is that the "soft" versions
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* uses local minima and maxima computed over 3x3 square blocks, and
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* the "sharp" version uses local minima and maxima computed over 3x3
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* crosses.
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*
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* The "sharp" version is (a little) faster. We don't know yet for
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* sure, but it appears that the "soft" version gives marginally
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* better results.
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*
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* If you want to use the "sharp" (cheaper) version, uncomment the
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* following three pre-processor code lines:
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*/
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// #ifndef __NOHALO_CHEAP_H__
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// #define __NOHALO_CHEAP_H__
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// #endif
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/*
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* ================
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* NOHALO RESAMPLER
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@ -705,6 +733,9 @@ nohalo_subdivision (const double uno_two,
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* own 3x3 subgroup of the 4x4 stencil. Consequently, the surface is
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* necessarily above the minimum of the four minima, which happens to
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* be the minimum over the 4x4. Similarly with the maxima.)
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*
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* The above paragraph described the "soft" version of LBB. The
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* "sharp" version is similar.
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*/
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static inline double
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@ -764,6 +795,67 @@ lbbicubic( const double c00,
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* location.
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*/
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#if defined (__NOHALO_CHEAP_H__)
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/*
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* Computation of the four min and four max over 3x3 input data
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* sub-crosses of the 4x4 input stencil.
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*
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* We exploit the fact that the data comes from the (co-monotone)
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* method Nohalo so that it is known ahead of time that
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*
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* dos_thr is between dos_two and dos_fou
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*
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* tre_two is between dos_two and qua_two
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*
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* tre_fou is between dos_fou and qua_fou
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*
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* qua_thr is between qua_two and qua_fou
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*
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* tre_thr is in the convex hull of dos_two, dos_fou, qua_two and qua_fou
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*
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* to minimize the number of flags and conditional moves.
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*
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* (The "between" are not strict: "a between b and c" means
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*
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* "min(b,c) <= a <= max(b,c)".)
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*
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* We have, however, succeeded in eliminating one flag computation
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* (one comparison) and one use of an intermediate result. See the
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* two commented out lines below.
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*
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* Overall, only 20 comparisons and 28 "? :" are needed (to compute
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* 4 mins and 4 maxes). If you can figure how to do this more
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* efficiently, let us know.
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*/
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const double m1 = (uno_two <= tre_two) ? uno_two : tre_two ;
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const double M1 = (uno_two <= tre_two) ? tre_two : uno_two ;
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const double m2 = (dos_thr <= qua_thr) ? dos_thr : qua_thr ;
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const double M2 = (dos_thr <= qua_thr) ? qua_thr : dos_thr ;
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const double m3 = (dos_two <= dos_fou) ? dos_two : dos_fou ;
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const double M3 = (dos_two <= dos_fou) ? dos_fou : dos_two ;
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const double m4 = (uno_thr <= tre_thr) ? uno_thr : tre_thr ;
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const double M4 = (uno_thr <= tre_thr) ? tre_thr : uno_thr ;
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const double m5 = (dos_two <= qua_two) ? dos_two : qua_two ;
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const double M5 = (dos_two <= qua_two) ? qua_two : dos_two ;
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const double m6 = (tre_one <= tre_thr) ? tre_one : tre_thr ;
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const double M6 = (tre_one <= tre_thr) ? tre_thr : tre_one ;
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const double m7 = (dos_one <= dos_thr) ? dos_one : dos_thr ;
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const double M7 = (dos_one <= dos_thr) ? dos_thr : dos_one ;
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const double m8 = (tre_two <= tre_fou) ? tre_two : tre_fou ;
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const double M8 = (tre_two <= tre_fou) ? tre_fou : tre_two ;
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const double m9 = NOHALO_MIN( m1, dos_two );
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const double M9 = NOHALO_MAX( M1, dos_two );
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const double m10 = NOHALO_MIN( m2, tre_thr );
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const double M10 = NOHALO_MAX( M2, tre_thr );
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const double min10 = NOHALO_MIN( m3, m4 );
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const double max10 = NOHALO_MAX( M3, M4 );
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const double min01 = NOHALO_MIN( m5, m6 );
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const double max01 = NOHALO_MAX( M5, M6 );
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const double min00 = NOHALO_MIN( m9, m7 );
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const double max00 = NOHALO_MAX( M9, M7 );
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const double min11 = NOHALO_MIN( m10, m8 );
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const double max11 = NOHALO_MAX( M10, M8 );
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#else
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/*
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* Computation of the four min and four max over 3x3 input data
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* sub-blocks of the 4x4 input stencil.
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@ -795,8 +887,8 @@ lbbicubic( const double c00,
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*
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* Overall, only 27 comparisons are needed (to compute 4 mins and 4
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* maxes!). Without the simplification, 28 comparisons would be
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* used. If you can figure how to do this more efficiently, let us
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* know.
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* used. Either way, the number of "? :" used is 34. If you can
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* figure how to do this more efficiently, let us know.
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*/
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const double m1 = (dos_two <= dos_thr) ? dos_two : dos_thr ;
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const double M1 = (dos_two <= dos_thr) ? dos_thr : dos_two ;
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@ -843,6 +935,8 @@ lbbicubic( const double c00,
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const double max00 = NOHALO_MAX( M8, M10 );
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const double min10 = NOHALO_MIN( m8, m12 );
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const double max10 = NOHALO_MAX( M8, M12 );
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#endif
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/*
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* The remainder of the "per channel" computation involves the
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* computation of:
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