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/multi_ncut/src/c/segment-image.c | 142 +++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 SD-VBS/benchmarks/multi_ncut/src/c/segment-image.c

(limited to 'SD-VBS/benchmarks/multi_ncut/src/c/segment-image.c')

diff --git a/SD-VBS/benchmarks/multi_ncut/src/c/segment-image.c b/SD-VBS/benchmarks/multi_ncut/src/c/segment-image.c
new file mode 100644
index 0000000..72bc16f
--- /dev/null
+++ b/SD-VBS/benchmarks/multi_ncut/src/c/segment-image.c
@@ -0,0 +1,142 @@
+/********************************
+Author: Sravanthi Kota Venkata
+********************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include "segment.h"
+
+#ifndef M_PI
+#define M_PI 3.141592653589793
+#endif
+
+// dissimilarity measure between pixels
+float diff(F2D *r, int x1, int y1, int x2, int y2) 
+{
+  return sqrt(abs(( subsref(r,y1,x1) * subsref(r,y1,x1)) - ( subsref(r,y2,x2) * subsref(r,y2,x2))));
+}
+
+I2D *segment_image(I2D* im, float sigma, float c, int min_size, int *num_ccs, 
+		   int* segments, edge* edges,
+                   F2D* imageOut, F2D* tempOut, I2D* kernel, 
+		   F2D* edgeWeights, F2D* in, I2D* ind,
+		   universe* u,
+		   I2D* output)
+{
+    int width = im->width;
+    int height = im->height;
+    int num = 0, x, y, i;
+    F2D* smooth_im;
+    //I2D *output;
+    //edge* edges;
+    int components = 0;
+/*  int *colors = (int *) malloc(width*height*sizeof(int)); */
+    //segments = (int *) malloc(height*width*sizeof(int));
+
+    // smooth each color channel  
+    smooth_im = imageReblur(im, imageOut, tempOut, kernel);
+
+    //build graph
+    //edges = (edge*)malloc(sizeof(edge)*width*height*4);
+
+    for (y = 0; y < height; y++) 
+    {
+        for (x = 0; x < width; x++) 
+        {
+            segments[y*width+x] = -1;
+            if (x < width-1) 
+            {
+        	    edges[num].a = y * width + x;
+	            edges[num].b = y * width + (x+1);
+	            edges[num].w = diff(smooth_im, x, y, x+1, y);
+	            num++;
+            }
+
+            if (y < height-1) 
+            {
+	            edges[num].a = y * width + x;
+	            edges[num].b = (y+1) * width + x;
+	            edges[num].w = diff(smooth_im, x, y, x, y+1);
+	            num++;
+            }
+
+            if ((x < width-1) && (y < height-1)) 
+            {
+	            edges[num].a = y * width + x;
+	            edges[num].b = (y+1) * width + (x+1);
+	            edges[num].w = diff(smooth_im, x, y, x+1, y+1);
+	            num++;
+            }
+
+            if ((x < width-1) && (y > 0)) 
+            {
+	            edges[num].a = y * width + x;
+	            edges[num].b = (y-1) * width + (x+1);
+	            edges[num].w = diff(smooth_im, x, y, x+1, y-1);
+	            num++;
+            }
+        }
+    }
+
+    //free(smooth_im);
+
+    // segment
+    u = segment_graph(width*height, num, edges, c, edgeWeights, in, ind, u);
+  
+    // post process small components
+    for (i = 0; i < num; i++) 
+    {
+        int a, b;
+        a = find(u,edges[i].a);
+        b = find(u,edges[i].b);
+        if ((a != b) && ((u->elts[a].size < min_size) || (u->elts[b].size < min_size)))
+            join(u, a, b);
+    }
+
+    //free(edges);
+    arrayref(num_ccs,0) = u->num;
+
+    // pick random colors for each component
+    //output = iMallocHandle(height, width);
+
+/*    srand(time(0));
+    for (i = 0; i < width*height; i++)
+    {
+        float temp;
+        temp = rand()/((float)RAND_MAX);
+        colors[i] = (int)(temp*255);
+    }
+*/
+   
+    for (y = 0; y < height; y++) 
+    {
+        for (x = 0; x < width; x++) 
+        {
+            int comp;
+            comp = find(u, y * width + x);
+            if(segments[comp] == -1)
+                segments[comp] = components++;
+            subsref(output, y, x) = segments[comp];
+        }
+    }  
+  
+/*
+    for (y = 0; y < height; y++) 
+    {
+        for (x = 0; x < width; x++) 
+        {
+            int comp;
+            comp = find(u, y * width + x);
+            subsref(output, y, x) = colors[comp];
+        }
+    }  
+*/
+    //free(u->elts);
+    //free(u);
+    //free(segments);
+    
+    return output;
+}
+
+
-- 
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