diff --git a/public/self/js/Director/detection.js b/public/self/js/Director/detection.js
index b165e0ddc..c822d7515 100644
--- a/public/self/js/Director/detection.js
+++ b/public/self/js/Director/detection.js
@@ -2853,8 +2853,8 @@ function isJSON(str) {
   img.onload = function(){
     loadFinished = false;
     // 初始设置画布大小，最大值宽和高
-    canvas.width = maxWidth;//document.getElementById("tool0").offsetWidth;
-    canvas.height = maxHeight;//document.getElementById("tool0").offsetWidth/1280*720;
+    canvas.width = img.width;// maxWidth document.getElementById("tool0").offsetWidth;
+    canvas.height =img.height;//maxHeight document.getElementById("tool0").offsetWidth/1280*720;
     //调整画布大小
     if ((img.width/img.height)<(canvas.width/canvas.height)){
       canvas.width=canvas.height * img.width / img.height;