diff --git a/observe_bact.html b/observe_bact.html
index 4f820bb..48a95ab 100644
--- a/observe_bact.html
+++ b/observe_bact.html
@@ -820,78 +820,36 @@
 
           objects_last = objects_this;
 
-          let contoursColor = new cv.Scalar(0, 0, 255,255);
 
-          cv.drawContours(src, contours, -1, contoursColor, 1 );
 
-          cv.imshow("canvas-draw", src);
+          cv.imshow("canvas-draw", draw);
 
           // schedule the next one.
           let delay = 1000/FPS - (Date.now() - begin);
           setTimeout(processVideo, delay);
+          //video.requestVideoFrameCallback(processVideo);
+
 
         } catch (err) {
             console.log(cv.exceptionFromPtr(err));
             contours.delete();
             hierarchy.delete();
-            cap.delete();
         }
     };
     // schedule the first one.
-    setTimeout(processVideo, 0);
+     setTimeout(processVideo, 0);
+    //video.requestVideoFrameCallback(processVideo);
   };
-    // init video switching get IDs of video inputs
 
-    var deviceIDs = [];
-
-    navigator.mediaDevices
-        .enumerateDevices()
-        .then((devices) => {
-          devices.forEach((device) => {
-            if (device.kind=="videoinput"){
-            deviceIDs.push(device.deviceId);
-            }
-            console.log(`${device.kind}: ${device.label} id = ${device.deviceId}`);
-          });
-        })
-        .catch((err) => {
-          console.error(`${err.name}: ${err.message}`);
-        });
-
-    // toggle between cameras
-
-    var device_index = 0;
-
-    function toggle_cam(){
-      device_index += 1
-      if (device_index>=deviceIDs.length){
-        device_index=0
-      };
-
-      if (navigator.mediaDevices.getUserMedia) {
-      navigator.mediaDevices.getUserMedia({ video: {
-        deviceId: deviceIDs[device_index],
-      }, })
-        .then(function (stream) {
-          video.srcObject = stream;
-        })
-        .catch(function (error) {
-          console.log("Something went wrong!");
-        });
-      }
-    };
     let streaming = false;
-
     function startup() {
       output = document.getElementById("output");
       video = document.getElementById("video");
-      canvas = document.getElementById("canvas-temp");
+
       canvas_draw = document.getElementById("canvas-draw");
-      photo = document.getElementById("photo");
-      startButton = document.getElementById("start-button");
 
       navigator.mediaDevices
-        .getUserMedia({ video: {width: { ideal:  99999} , height: { ideal: 99999 }}, audio: false })
+        .getUserMedia(microscope_setup.video_prefs)
         .then((stream) => {
           video.srcObject = stream;
           video.play();
@@ -912,7 +870,6 @@
 
             photo.style.aspectRatio = video_aspect;
 
-            canvas.style.aspectRatio = video_aspect;
 
             canvas_draw.style.aspectRatio = video_aspect;
             canvas_draw.height = canvas_draw.height*5;
@@ -924,8 +881,6 @@
         false,
       );
     }
-      window.addEventListener("load", startup, false);
 
 </script>
-</body>
 </html>