From d17b33131c14864bd1eae275f49a3f148e21cf29 Mon Sep 17 00:00:00 2001
From: Leo Chan <leochanj@live.unc.edu>
Date: Thu, 22 Oct 2020 01:53:21 -0400
Subject: Squashed commit of the sb-vbs branch.

Includes the SD-VBS benchmarks modified to:
- Use libextra to loop as realtime jobs
- Preallocate memory before starting their main computation
- Accept input via stdin instead of via argc

Does not include the SD-VBS matlab code.

Fixes libextra execution in LITMUS^RT.
---
 SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c | 81 ++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c

(limited to 'SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c')

diff --git a/SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c b/SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c
new file mode 100644
index 0000000..40f03dc
--- /dev/null
+++ b/SD-VBS/benchmarks/tracking/src/c/calcAreaSum.c
@@ -0,0 +1,81 @@
+/********************************
+Author: Sravanthi Kota Venkata
+********************************/
+
+#include "tracking.h"
+
+/** Compute the sum of pixels over pixel neighborhood.
+    Neighborhood = winSize*winSize 
+    This will be useful when we compute the displacement
+    of the neighborhood across frames instead of tracking each pixel.
+
+    Input:  src Image
+            # rows, cols, size of window
+    Output: windowed-sum image, ret.
+
+    Example:
+    
+    winSize = 4, cols = 8, rows = 16
+    nave_half = 2, nave = 4
+    Say, the first row of the image is:
+                3 8 6 2 4 8 9 5
+    a1 =    0 0 3 8 6 2 4 8 9 5 0 0 (append nave_half zeros to left and right border)
+    asum =  (sum the first nave # pixels - 0 0 3 8 ) = 11
+    ret(0,0) =  11
+    For ret(0,1), we need to move the window to the right by one pixel and subtract
+    from a1sum the leftmost pixel. So, we add value 6 and subtract value at a1(0,0), = 0 here.
+    ret(0,1) = 17 = a1sum
+    For ret(0,2), a1sum - a1(0,1) + a1(2+nave) = 17 - 0 + 2 = 19 = a1sum
+    For ret(0,3), a1sum - a1(0,2) + a1(3+nave) = 19 - 3 + 4 = 20 = a1sum
+
+    We proceed this way for all the rows and then perform summantion across all cols.
+**/
+F2D* calcAreaSum(F2D* src, int cols, int rows, int winSize)
+{
+    int nave, nave_half, i, j, k;
+    F2D *ret, *a1;
+    float a1sum;
+    
+    nave = winSize;
+    nave_half = floor((nave+1)/2);
+
+    ret = fMallocHandle(rows, cols);
+    a1 = fSetArray(1, cols+nave,0);
+
+    for(i=0; i<rows; i++)
+    {
+        for(j=0; j<cols; j++) {
+            asubsref(a1,j+nave_half) = subsref(src,i,j);
+		}
+        a1sum = 0;
+        for(k=0; k<nave; k++) {
+            a1sum += asubsref(a1,k);
+		}
+        for(j=0; j<cols; j++)
+        {
+            subsref(ret,i,j) = a1sum;
+            a1sum += asubsref(a1,j+nave) - asubsref(a1,j);
+        }
+    }
+    fFreeHandle(a1);
+
+    a1 = fSetArray(1, rows+nave,0);
+    for(i=0; i<cols; i++)
+    {
+        for(j=0; j<rows; j++) {
+            asubsref(a1,j+nave_half) = subsref(ret,j,i);
+		}
+        a1sum = 0;
+        for(k=0; k<nave; k++) {
+            a1sum += asubsref(a1,k);
+		}
+        for(j=0; j<rows; j++)
+        {
+            subsref(ret,j,i) = a1sum;
+            a1sum += asubsref(a1,j+nave) - asubsref(a1,j);
+        }
+    }
+    fFreeHandle(a1);
+
+    return ret; 
+}
-- 
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