lbb resampler comments
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@ -213,7 +213,7 @@ lbbicubic( const double c00,
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/*
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/*
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* Computation of the four min and four max over 3x3 input data
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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 (involves 28 flag
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* sub-blocks of the 4x4 input stencil (involves 28 flag
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* computations):
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* computations if done with conditional moves):
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*/
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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_two : dos_thr;
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const double M1 = (dos_two <= dos_thr) ? dos_thr : dos_two;
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const double M1 = (dos_two <= dos_thr) ? dos_thr : dos_two;
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@ -249,6 +249,26 @@ lbbicubic( const double c00,
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const double max01 = LBB_MAX( M9, M12 );
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const double max01 = LBB_MAX( M9, M12 );
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const double min11 = LBB_MIN( m9, m13 );
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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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const double max11 = LBB_MAX( M9, M13 );
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/*
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* The remainder of the computation involves the computation of:
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*
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* --8 conditional moves,
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*
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* --8 signs (in which the sign of zero is unimportant),
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*
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* --12 minima of two values,
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*
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* --8 maxima of two values,
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*
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* --8 absolute values,
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*
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* for a grand total of 29 minima, 25 maxima, 8 conditional moves, 8
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* signs, and 8 absolute values. (If everything is done with
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* conditional moves, "only" 28+8+8+12+8+8=72 flags are involved.)
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*
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* This part of the computation also involves 109 arithmetic (*,+,-)
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* arithmetic operations (to be double checked).
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*/
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/*
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/*
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* Distances to the local min and max:
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* Distances to the local min and max:
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