diff --git a/library/src/main/java/org/easydarwin/sw/TxtOverlay.java b/library/src/main/java/org/easydarwin/sw/TxtOverlay.java
index e02dd27..b88f509 100644
--- a/library/src/main/java/org/easydarwin/sw/TxtOverlay.java
+++ b/library/src/main/java/org/easydarwin/sw/TxtOverlay.java
@@ -68,9 +68,9 @@ public class TxtOverlay {
             lastTipUpdateTime = currentTimeMillis;
             mTip = txt;
             // 文字转bitmap
-            bmp = YUVUtils.generateBitmap(dateFormat.format(lastTipUpdateTime) + "@" + txt, 30, Color.WHITE);
+            bmp = YUVUtils.generateBitmap(dateFormat.format(lastTipUpdateTime) + "@" + txt, 16, Color.WHITE);
             // 缩放旋转bitmap
-            bmp = YUVUtils.scaleImage(bmp, bmp.getWidth() / 2, bmp.getHeight() / 2, cameraRotationOffset);
+            bmp = YUVUtils.rotateImage(bmp, cameraRotationOffset);
             //转YUV
             mark = YUVUtils.getYUVByBitmap(bmp);
         }
diff --git a/library/src/main/java/org/easydarwin/util/YUVUtils.java b/library/src/main/java/org/easydarwin/util/YUVUtils.java
index beb85b2..c61cd16 100644
--- a/library/src/main/java/org/easydarwin/util/YUVUtils.java
+++ b/library/src/main/java/org/easydarwin/util/YUVUtils.java
@@ -28,6 +28,23 @@ public class YUVUtils {
         return newbm;
     }
 
+    public static Bitmap rotateImage(Bitmap bm, int cameraRotationOffset) {
+        if (bm == null) {
+            return null;
+        }
+        int width = bm.getWidth();
+        int height = bm.getHeight();
+        Matrix matrix = new Matrix();
+        matrix.postRotate(360 - cameraRotationOffset);
+        Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix,
+                true);
+        if (bm != null & !bm.isRecycled()) {
+            bm.recycle();
+            bm = null;
+        }
+        return newbm;
+    }
+
     //图片转YUV
     public static byte[] getYUVByBitmap(Bitmap bitmap) {
         if (bitmap == null) {
@@ -90,6 +107,9 @@ public class YUVUtils {
                 width = Math.max(width, (int) Math.ceil(textPaint.measureText(split[i])));
             }
             int height = lineHeight * split.length;
+            // 宽高向上取偶数
+            width = (width + 1) / 2 * 2;
+            height = (height + 1) / 2 * 2;
             bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(bitmap);
             for (int i = 0; i < split.length; i++) {
@@ -98,6 +118,9 @@ public class YUVUtils {
         } else {
             int width = (int) Math.ceil(textPaint.measureText(text));
             int height = lineHeight;
+            // 宽高向上取偶数
+            width = (width + 1) / 2 * 2;
+            height = (height + 1) / 2 * 2;
             bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(bitmap);
             canvas.drawText(text, 0, Math.abs(fontMetrics.ascent), textPaint);