diff --git a/modules/wechat_qrcode/src/zxing/qrcode/detector/finder_pattern_finder.cpp b/modules/wechat_qrcode/src/zxing/qrcode/detector/finder_pattern_finder.cpp
index 438928c09..93017a7f5 100644
--- a/modules/wechat_qrcode/src/zxing/qrcode/detector/finder_pattern_finder.cpp
+++ b/modules/wechat_qrcode/src/zxing/qrcode/detector/finder_pattern_finder.cpp
@@ -1066,8 +1066,6 @@ bool FinderPatternFinder::handlePossibleCenter(int* stateCount, size_t i, size_t
     }
     float estimatedHorizontalModuleSize = (float)stateCountTotal / 7.0f;
 
-    float estimatedVerticalModuleSize;
-
     // try different size according to the estimatedHorizontalModuleSize
     float tolerateModuleSize =
         estimatedHorizontalModuleSize > 4.0 ? estimatedHorizontalModuleSize / 2.0f : 1.0f;
@@ -1082,7 +1080,9 @@ bool FinderPatternFinder::handlePossibleCenter(int* stateCount, size_t i, size_t
     int image_width = image_->getWidth();
     for (int k = 0; k < CENTER_CHECK_TIME; k++) {
         float possibleCenterJ = possbileCenterJs[k];
-        if (possibleCenterJ < 0 || possibleCenterJ >= image_width) continue;
+        if (possibleCenterJ < 0 || possibleCenterJ >= image_width)
+            continue;
+        float estimatedVerticalModuleSize = 0;
         float centerI = crossCheckVertical(i, (size_t)possibleCenterJ, stateCount[2],
                                            stateCountTotal, estimatedVerticalModuleSize);
 
@@ -1505,4 +1505,4 @@ Ref<BitMatrix> FinderPatternFinder::getImage() { return image_; }
 vector<Ref<FinderPattern>>& FinderPatternFinder::getPossibleCenters() { return possibleCenters_; }
 
 }  // namespace qrcode
-}  // namespace zxing
\ No newline at end of file
+}  // namespace zxing
diff --git a/modules/wechat_qrcode/test/test_qrcode.cpp b/modules/wechat_qrcode/test/test_qrcode.cpp
index ec2559b0e..7820329de 100644
--- a/modules/wechat_qrcode/test/test_qrcode.cpp
+++ b/modules/wechat_qrcode/test/test_qrcode.cpp
@@ -303,7 +303,7 @@ TEST(Objdetect_QRCode_points_position, rotate45) {
     Ptr<QRCodeEncoder> qrcode_enc = cv::QRCodeEncoder::create(params);
     Mat qrImage;
     qrcode_enc->encode(expect_msg, qrImage);
-    Mat image(800, 800, CV_8UC1);
+    Mat image(800, 800, CV_8UC1, Scalar(0));
     const int pixInBlob = 4;
     Size qrSize = Size((21+(params.version-1)*4)*pixInBlob,(21+(params.version-1)*4)*pixInBlob);
     Rect2f rec(static_cast<float>((image.cols - qrSize.width)/2),
@@ -364,7 +364,7 @@ TEST(Objdetect_QRCode_Big, regression) {
     Ptr<QRCodeEncoder> qrcode_enc = cv::QRCodeEncoder::create(params);
     Mat qrImage;
     qrcode_enc->encode(expect_msg, qrImage);
-    Mat largeImage(4032, 3024, CV_8UC1);
+    Mat largeImage(4032, 3024, CV_8UC1, Scalar(0));
     const int pixInBlob = 4;
     Size qrSize = Size((21+(params.version-1)*4)*pixInBlob,(21+(params.version-1)*4)*pixInBlob);
     Mat roiImage = largeImage(Rect((largeImage.cols - qrSize.width)/2, (largeImage.rows - qrSize.height)/2,
@@ -395,7 +395,7 @@ TEST(Objdetect_QRCode_Tiny, regression) {
     Ptr<QRCodeEncoder> qrcode_enc = cv::QRCodeEncoder::create(params);
     Mat qrImage;
     qrcode_enc->encode(expect_msg, qrImage);
-    Mat tinyImage(80, 80, CV_8UC1);
+    Mat tinyImage(80, 80, CV_8UC1, Scalar(0));
     const int pixInBlob = 2;
     Size qrSize = Size((21+(params.version-1)*4)*pixInBlob,(21+(params.version-1)*4)*pixInBlob);
     Mat roiImage = tinyImage(Rect((tinyImage.cols - qrSize.width)/2, (tinyImage.rows - qrSize.height)/2,