diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index 432418c4..b4c2fafa 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -648,22 +648,26 @@ bool CPhoneDevice::OnImageReady(const cv::Mat& mat)
     double fontScale = 1; // base 1024
     double height = mat.size().height;
     double width = mat.size().width;
-    double ratio = std::min(height / 1024, width / 1920);
+    // double ratio = std::min(height / 1024, width / 1920);
+    double ratio = std::sqrt((height * width) / (1024.0 * 1920.0));
     fontScale = fontScale * ratio;
 
     int thickness2 = 1 * ratio;
     if (thickness2 == 0) thickness2 = 1;
-    int thickness1 = thickness2 + 1;
+    int thickness1 = thickness2 + 3;
 
     cv::Scalar scalar1(0, 0, 0);    // black
     cv::Scalar scalar2(255, 255, 255);  // white
+    cv::Scalar bgScalar(255, 255, 255);  // white
     cv::Point pt1, pt2;
     for (vector<OSD_INFO>::const_iterator it = mOsds.cbegin(); it != mOsds.cend(); ++it)
     {
-        textSize = cv::getTextSize(it->text, cv::FONT_HERSHEY_COMPLEX, fontScale, thickness1, &baseline);
-        textSize2 = cv::getTextSize(it->text, cv::FONT_HERSHEY_COMPLEX, fontScale, thickness2, &baseline);
-
-        ALOGE("putText: w1=%d w2=%d tn=%d/%d", textSize.width, textSize2.width, thickness1, thickness2);
+        if (it->text.empty())
+        {
+            continue;
+        }
+        textSize = cv::getTextSize(it->text, cv::FONT_HERSHEY_SIMPLEX, fontScale, thickness1, &baseline);
+        textSize2 = cv::getTextSize(it->text, cv::FONT_HERSHEY_SIMPLEX, fontScale, thickness2, &baseline);
 
         if (it->alignment == OSD_ALIGNMENT_TOP_LEFT)
         {
@@ -686,8 +690,19 @@ bool CPhoneDevice::OnImageReady(const cv::Mat& mat)
             pt1.y = height - it->y * ratio;
         }
 
+        cv::Point pt = pt1;
+        pt.x += textSize.width;
+        pt.y -= textSize.height;
+
+        // cv::rectangle(mat, pt1, pt, scalar2, -1);
+        pt2 = pt1;
+        pt2.y +=  textSize.height;
+
+        ALOGE("putText: fontScale=%f w1=%d w2=%d tn=%d/%d", fontScale, textSize.width, textSize2.width, thickness1, thickness2);
+
         cv::putText(mat, it->text, pt1, cv::FONT_HERSHEY_COMPLEX, fontScale, scalar1, thickness1,cv::LINE_AA);
         cv::putText(mat, it->text, pt1, cv::FONT_HERSHEY_COMPLEX, fontScale, scalar2, thickness2,cv::LINE_AA);
+
     }
 
     vector <int> compression_params;