use border extrapolation for central pixel in pyrDown

in case if image has odd dimension (cherry picked from commit 13252133)

use border extrapolation for central pixel in pyrDown
in case if image has odd dimension (cherry picked from commit 13252133)
7708e988 · Vladislav Vinogradov · Alexander Smorkalov · fe1bd0cc · 7708e988
Commit 7708e988 authored Apr 23, 2015 by Vladislav Vinogradov Committed by Alexander Smorkalov May 06, 2015
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pyr_down.cu modules/gpu/src/cuda/pyr_down.cu +3 -3

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--- a/modules/gpu/src/cuda/pyr_down.cu
+++ b/modules/gpu/src/cuda/pyr_down.cu
@@ -114,7 +114,7 @@ namespace cv { namespace gpu { namespace device
                    sum =       0.0625f * src(b.idx_row_low (src_y - 2), b.idx_col_high(x));
                    sum = sum + 0.25f   * src(b.idx_row_low (src_y - 1), b.idx_col_high(x));
-                    sum = sum + 0.375f  * src(src_y                    , b.idx_col_high(x));
+                    sum = sum + 0.375f  * src(b.idx_row_high(src_y    ), b.idx_col_high(x));
                    sum = sum + 0.25f   * src(b.idx_row_high(src_y + 1), b.idx_col_high(x));
                    sum = sum + 0.0625f * src(b.idx_row_high(src_y + 2), b.idx_col_high(x));
@@ -129,7 +129,7 @@ namespace cv { namespace gpu { namespace device
                    sum =       0.0625f * src(b.idx_row_low (src_y - 2), b.idx_col(left_x));
                    sum = sum + 0.25f   * src(b.idx_row_low (src_y - 1), b.idx_col(left_x));
-                    sum = sum + 0.375f  * src(src_y                    , b.idx_col(left_x));
+                    sum = sum + 0.375f  * src(b.idx_row_high(src_y    ), b.idx_col(left_x));
                    sum = sum + 0.25f   * src(b.idx_row_high(src_y + 1), b.idx_col(left_x));
                    sum = sum + 0.0625f * src(b.idx_row_high(src_y + 2), b.idx_col(left_x));
@@ -144,7 +144,7 @@ namespace cv { namespace gpu { namespace device
                    sum =       0.0625f * src(b.idx_row_low (src_y - 2), b.idx_col_high(right_x));
                    sum = sum + 0.25f   * src(b.idx_row_low (src_y - 1), b.idx_col_high(right_x));
-                    sum = sum + 0.375f  * src(src_y                    , b.idx_col_high(right_x));
+                    sum = sum + 0.375f  * src(b.idx_row_high(src_y    ), b.idx_col_high(right_x));
                    sum = sum + 0.25f   * src(b.idx_row_high(src_y + 1), b.idx_col_high(right_x));
                    sum = sum + 0.0625f * src(b.idx_row_high(src_y + 2), b.idx_col_high(right_x));