diff --git a/alg/libqr.cpp b/alg/libqr.cpp
index e5da78b..585044c 100644
--- a/alg/libqr.cpp
+++ b/alg/libqr.cpp
@@ -95,9 +95,12 @@ bool detect_qr(ProcessState &ps, float margin_ratio, bool warp, string &err)
     }
     int qr_width = max_x - min_x;
     int qr_height = max_y - min_y;
-    if (qr_width < 200 && qr_height < 200 && qr_width < ps.orig->cols * 0.5 && qr_height < ps.orig->rows * 0.5) {
-        printf("(%d, %d) in (%d, %d)\n", qr_width, qr_height, ps.orig->cols, ps.orig->rows);
-        err = "qr too small";
+    float min_ratio = 0.3;
+    int min_width = std::max(180, (int)(ps.orig->cols * min_ratio));
+    int min_height = std::max(180, (int)(ps.orig->rows * min_ratio));
+    if (qr_width < min_width && qr_height < min_height) {
+        err = string_format("qr too small: %d x %d, thres: %d x %d",
+                            qr_width, qr_height, min_width, min_height);
         return false;
     }
 
diff --git a/scanner/pages/emblemscanner/assets/qrtool.wx.wasm.br b/scanner/pages/emblemscanner/assets/qrtool.wx.wasm.br
index e21b689..12c8e6a 100755
Binary files a/scanner/pages/emblemscanner/assets/qrtool.wx.wasm.br and b/scanner/pages/emblemscanner/assets/qrtool.wx.wasm.br differ
diff --git a/scanner/pages/emblemscanner/emblemscanner.js b/scanner/pages/emblemscanner/emblemscanner.js
index b736e23..45d8b81 100644
--- a/scanner/pages/emblemscanner/emblemscanner.js
+++ b/scanner/pages/emblemscanner/emblemscanner.js
@@ -562,11 +562,20 @@ Page({
    * Handle QR processing result
    */
   handleQRResult(result, frame, copiedFrameData = null) {
-    // Update debug info if available
-    if (result.debug_data_url) {
-      this.setData({
-        debug_image_data_url: result.debug_data_url
-      });
+    // Update debug info - prioritize WASM debug image, fallback to original frame
+    if (this.data.enable_debug) {
+      if (result.debug_data_url) {
+        // Priority 1: WASM returned a processed debug image (with QR detection overlay, etc.)
+        this.setData({
+          debug_image_data_url: result.debug_data_url
+        });
+      } else if (this.data.debug_current_frame_url) {
+        // Priority 2: No WASM debug image available, show the raw camera frame
+        this.setData({
+          debug_image_data_url: this.data.debug_current_frame_url
+        });
+      }
+      // If neither exists, the debug image box will remain empty/previous image
     }
     
     // Generate hint text
@@ -576,7 +585,7 @@ Page({
     // don't require ok as we only care about the view has a valid qrcode in it
     // zooming in so that it's more likely to be clear enough for upload
     if (result.qrcode && result.valid_pattern && is_emblem_qr_pattern(result.qrcode)) {
-      this.addDebugMessage(`QR detected and ready: ${result.qrcode}`);
+      this.addDebugMessage(`QR detected: ${result.qrcode} ok: ${result.ok}: err ${result.err}`);
       
       // Trigger zoom-in if function is set up
       if (!this.data.first_qr_found && this.on_first_qr_found) {
@@ -785,7 +794,7 @@ Page({
   updateDebugFrameUrls(frameDataUrl) {
     if (!this.data.enable_debug) return;
     
-    // Just show the current frame
+    // Store current frame URL for potential use as fallback
     this.setData({
       debug_current_frame_url: frameDataUrl
     });
diff --git a/scanner/pages/emblemscanner/emblemscanner.wxml b/scanner/pages/emblemscanner/emblemscanner.wxml
index 4feefec..6a4585b 100644
--- a/scanner/pages/emblemscanner/emblemscanner.wxml
+++ b/scanner/pages/emblemscanner/emblemscanner.wxml
@@ -23,7 +23,8 @@
         <!-- WeChat native camera -->
         <camera class="camera" 
                 flash="{{ camera_flash }}"
-                frame-size="medium"
+                frame-size="large"
+                resolution="high"
                 bindinitdone="onCameraReady"
                 binderror="onCameraError">
         </camera>
@@ -73,9 +74,7 @@
         <view class="debug-top-row">
             <view class="debug-image-box">
                 <image src="{{ debug_image_data_url }}"></image>
-            </view>
-            <view class="debug-frame-box">
-                <image src="{{ debug_current_frame_url }}"></image>
+                <view class="debug-label">Debug Frame</view>
             </view>
             <view class="debug-info-panel">
                 <view class="debug-items">
diff --git a/scanner/pages/emblemscanner/emblemscanner.wxss b/scanner/pages/emblemscanner/emblemscanner.wxss
index 0109170..1380bff 100644
--- a/scanner/pages/emblemscanner/emblemscanner.wxss
+++ b/scanner/pages/emblemscanner/emblemscanner.wxss
@@ -219,17 +219,6 @@ view.debug {
     border: 1px solid rgba(239, 72, 35, 0.8);
 }
 
-.debug-frame-box {
-    flex-shrink: 0;
-}
-
-.debug-frame-box image {
-    width: 64px;
-    height: 64px;
-    border: 1px solid rgba(35, 150, 239, 0.8);
-}
-
-.debug-frame-box .debug-label,
 .debug-image-box .debug-label {
     font-size: 8px;
     color: #ffffff;