X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/book_gpu.git/blobdiff_plain/1b27427d56ddc474598ea928b11c31bcaf3f1e12..1ac5b5a535d9154c4f080e94f2f9a49ab6e299b7:/BookGPU/Chapters/chapter3/code/medianGeneric.cu~

diff --git a/BookGPU/Chapters/chapter3/code/medianGeneric.cu~ b/BookGPU/Chapters/chapter3/code/medianGeneric.cu~
index 7280904..bf41842 100755
--- a/BookGPU/Chapters/chapter3/code/medianGeneric.cu~
+++ b/BookGPU/Chapters/chapter3/code/medianGeneric.cu~
@@ -1,11 +1,25 @@
-__device__ inline void s(int* a, int* b)
-{
+__global__ void kernel_medianR( short *output,
+                                int i_dim, int j_dim, int r)
+{   
+  // absolute coordinates of the center pixel
+  int j = __mul24(blockIdx.x,blockDim.x) + threadIdx.x ; 
+  int i = __mul24(blockIdx.y,blockDim.y) + threadIdx.y ;
   
-  int tmp ;
-  if (*a > *b)
+  short cpt, ic, jc ;
+  short histogram[256] ; // 8 bit image    
+  // zeroing histogram data
+  for (ic =0; ic<256; ic++) histogram[ ic ]=0 ; 
+  // histogram filling
+  for(ic=i-r; ic<=i+r; ic++ )
+	for(jc=j-r; jc<=j+r; jc++)
+	  histogram[ tex2D(tex_img_ins, jc, ic) ]++ ;
+  // histogram parsing
+  cpt = 0 ;
+  for(ic=0; ic<256; ic++)
 	{
-	  tmp = *b ;
-	  *b = *a ;
-	  *a = tmp ;
-	  }
+	  cpt += histogram[ ic ] ;
+	  // selection of 50% percentile 
+	  if ( cpt > ((2*r+1)*(2*r+1))>>1 ) break ; 
+	} 
+  output[ __mul24(i, j_dim) +j ] =  ic ;  
 }