diff --git a/Image Interpolation/BilinearInterpolation.cpp b/Image Interpolation/BilinearInterpolation.cpp
index a754e7d..91c9a25 100644
--- a/Image Interpolation/BilinearInterpolation.cpp	
+++ b/Image Interpolation/BilinearInterpolation.cpp	
@@ -8,16 +8,18 @@ Mat BilinearInterpolation(Mat src, float sx, float sy) {
 	int dst_col = round(col * sy);
 	Mat dst(dst_row, dst_col, CV_8UC3);
 	for (int i = 0; i < dst_row; i++) {
-		int index_i = (i + 0.5) / sx - 0.5;
+		float index_i = (i + 0.5) / sx - 0.5;
 		if (index_i < 0) index_i = 0;
-		if (index_i > row - 2) index_i = row - 2;
+		if (sx < 1.0 && index_i > row - 2) index_i = row - 2;
+		if (sx >= 1.0 && index_i > row - 1) index_i = row - 1;
 		int i1 = floor(index_i);
 		int i2 = ceil(index_i);
-		float u = index_i - i;
+		float u = index_i - i1;
 		for (int j = 0; j < dst_col; j++) {
 			float index_j = (j + 0.5) / sy - 0.5;
 			if (index_j < 0) index_j = 0;
-			if (index_j > col - 2) index_j = col - 2;
+			if (sy < 1.0 && index_j > col - 2) index_j = col - 2;
+			if (sy >= 1.0 && index_j > col - 1) index_j = col - 1;
 			int j1 = floor(index_j);
 			int j2 = ceil(index_j);
 			float v = index_j - j1;
@@ -28,4 +30,4 @@ Mat BilinearInterpolation(Mat src, float sx, float sy) {
 		}
 	}
 	return dst;
-}
\ No newline at end of file
+}
diff --git a/Image Interpolation/NearestNeighborInterpolation.cpp b/Image Interpolation/NearestNeighborInterpolation.cpp
index 892561e..c62b5d2 100644
--- a/Image Interpolation/NearestNeighborInterpolation.cpp	
+++ b/Image Interpolation/NearestNeighborInterpolation.cpp	
@@ -9,8 +9,8 @@ Mat NearestNeighborInterpolation(Mat src, float sx, float sy) {
 		Mat dst(dst_row, dst_col, CV_8UC1);
 		for (int i = 0; i < dst_row; i++) {
 			for (int j = 0; j < dst_col; j++) {
-				int pre_i = round(i / sy);
-				int pre_j = round(j / sx);
+				int pre_i = floor(i / sy);
+				int pre_j = floor(j / sx);
 				if (pre_i > row - 1) pre_i = row - 1;
 				if (pre_j > col - 1) pre_j = col - 1;
 				dst.at<uchar>(i, j) = src.at<uchar>(pre_i, pre_j);
@@ -22,8 +22,8 @@ Mat NearestNeighborInterpolation(Mat src, float sx, float sy) {
 		Mat dst(dst_row, dst_col, CV_8UC3);
 		for (int i = 0; i < dst_row; i++) {
 			for (int j = 0; j < dst_col; j++) {
-				int pre_i = round(i / sy);
-				int pre_j = round(j / sx);
+				int pre_i = floor(i / sy);
+				int pre_j = floor(j / sx);
 				if (pre_i > row - 1) pre_i = row - 1;
 				if (pre_j > col - 1) pre_j = col - 1;
 				dst.at<Vec3b>(i, j)[0] = src.at<Vec3b>(pre_i, pre_j)[0];
@@ -33,4 +33,4 @@ Mat NearestNeighborInterpolation(Mat src, float sx, float sy) {
 		}
 		return dst;
 	}
-}
\ No newline at end of file
+}
diff --git a/README.md b/README.md
index 0aa7953..3c598d5 100644
--- a/README.md
+++ b/README.md
@@ -38,9 +38,3 @@
 - MedianSideWindowFilter.cpp C++复现了CVPR2019《Side Window Filter》论文(Median Filter)，实现霸气的强制保边，原理请看：https://blog.csdn.net/just_sort/article/details/93664078
 - RectangleDetection.cpp C++复现了StackOverFlow上面的一个有趣的矩形检测算法，并且配合Side Window Filter可以取得更好的效果，原理请看：https://blog.csdn.net/just_sort/article/details/104754937
 
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