From f618466c25d43f3bae9e40920273bf77de1e1149 Mon Sep 17 00:00:00 2001
From: leochanj105 <leochanj@live.unc.edu>
Date: Mon, 19 Oct 2020 23:09:30 -0400
Subject: initial sd-vbs

initial sd-vbs

add sd-vbs

sd-vbs
---
 SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c | 103 ++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c

(limited to 'SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c')

diff --git a/SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c b/SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c
new file mode 100644
index 0000000..e0adeff
--- /dev/null
+++ b/SD-VBS/benchmarks/sift/src/matlab/imsmooth_.c
@@ -0,0 +1,103 @@
+#include<stdlib.h>
+#include<string.h>
+#include<math.h>
+#include "imsmooth.h"
+
+#define greater(a,b) ((a) > (b))
+#define min(a,b) (((a)<(b))?(a):(b))
+#define max(a,b) (((a)>(b))?(a):(b))
+
+const double win_factor = 1.5 ;
+const int nbins = 36 ;
+
+float* imsmooth(float* I_pt_, float dsigma)
+{
+  int M,N ;
+  float *I_pt ;
+  float* J_pt_, *J_pt ;
+  float* out_, *out;
+  float s ;
+  enum {I=0,S} ;
+  enum {J=0} ;
+
+  /* ------------------------------------------------------------------
+  **                                                Check the arguments
+  ** --------------------------------------------------------------- */ 
+
+  M = (int)in_[0];
+  N = (int)in_[1];
+
+  out_ = fMallocHandle(M, N);
+    J_pt_ = &(out_[0]);
+    J_pt = &(J_pt_[4]);
+    s = dsigma;
+    
+
+  /* ------------------------------------------------------------------
+  **                                                         Do the job
+  ** --------------------------------------------------------------- */ 
+  if(s > 0.01) 
+  {
+    
+    int W = (int) ceil(4*s) ;
+    int i ; 
+    int j ;
+    float* g0_, *g0, *buffer_, *buffer, acc;
+    g0_ = fMallocHandle(1, 2*W+1);
+    g0 = &(g0_[4]);
+    buffer_ = fMallocHandle(M, N);
+    acc=0.0 ;
+    
+    for(j = 0 ; j < 2*W+1 ; ++j) 
+    {
+      g0[j] = exp(-0.5 * (j - W)*(j - W)/(s*s)) ;
+      acc += g0[j] ;
+    }
+
+    for(j = 0 ; j < 2*W+1 ; ++j) 
+    {
+      g0[j] /= acc ;
+    }
+    
+    /*
+    ** Convolve along the columns
+    **/
+
+    for(j = 0 ; j < N ; ++j) 
+    {
+      for(i = 0 ; i < M ; ++i) 
+      {
+        float* start = I_pt + max(i-W,0) + j*M ;        
+        float* stop = I_pt + min(i+W,M-1) + j*M + 1 ;
+        float* g = g0 + max(0, W-i) ;
+        acc = 0.0 ;
+        while(stop != start) acc += (*g++) * (*start++) ;
+        *buffer++ = acc ;
+      }
+    }
+    buffer -= M*N ;
+    
+    /*
+    ** Convolve along the rows
+    **/
+    for(j = 0 ; j < N ; ++j) 
+    {
+      for(i = 0 ; i < M ; ++i) 
+      {
+        float* start = buffer + i + max(j-W,0)*M ;
+        float* stop  = buffer + i + min(j+W,N-1)*M + M ;
+        float* g = g0 + max(0, W-j) ;
+        acc = 0.0 ;
+        while(stop != start) { acc += (*g++) * (*start) ; start+=M ;}
+        *J_pt++ = acc ;
+      }
+    }    
+    free(buffer) ;
+    free(g0) ;
+  } 
+  else 
+  {
+    memcpy(J_pt, I_pt, sizeof(double)*M*N) ;   
+  }
+  return J_pt_;
+}
-- 
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