diff --git a/src/strategies/generic/picture-generic.c b/src/strategies/generic/picture-generic.c
index d80e3706..3f3eec17 100644
--- a/src/strategies/generic/picture-generic.c
+++ b/src/strategies/generic/picture-generic.c
@@ -190,6 +190,9 @@ static int32_t hadamard_4x4_generic(int32_t diff[4*4])
   for (int i = 0; i < 16; i++) {
     satd += abs(d[i]);
   }
+
+  satd -= abs(d[0]);
+  satd += abs(d[0]) >> 2;
   satd = ((satd + 1) >> 1);
 
   return satd;
@@ -334,7 +337,11 @@ static unsigned satd_8x8_subblock_generic(const uvg_pixel * piOrg, const int32_t
     sad += abs(((int*)m2)[i]);
   }
 
+
+  sad -= abs(m2[0][0]);
+  sad += abs(m2[0][0]) >> 2;
   sad = (sad + 2) >> 2;
+  
 
   return sad;
 }
@@ -375,7 +382,7 @@ static void satd_ ## n ## x ## n ## _dual_generic( \
   for (y = 0; y < (n); y += 8) { \
   unsigned row = y * (n); \
   for (x = 0; x < (n); x += 8) { \
-  sum += satd_8x8_subblock_generic(&preds[0][row + x], (n), &orig[row + x], (n)); \
+  sum += satd_8x8_subblock_generic(&orig[row + x], (n), &preds[0][row + x], (n)); \
   } \
   } \
   costs_out[0] = sum>>(UVG_BIT_DEPTH-8); \
@@ -384,7 +391,7 @@ static void satd_ ## n ## x ## n ## _dual_generic( \
   for (y = 0; y < (n); y += 8) { \
   unsigned row = y * (n); \
   for (x = 0; x < (n); x += 8) { \
-  sum += satd_8x8_subblock_generic(&preds[1][row + x], (n), &orig[row + x], (n)); \
+  sum += satd_8x8_subblock_generic(&orig[row + x], (n), &preds[1][row + x], (n)); \
   } \
   } \
   costs_out[1] = sum>>(UVG_BIT_DEPTH-8); \