diff --git a/main.go b/main.go
index 9f26a04..c5579fe 100755
--- a/main.go
+++ b/main.go
@@ -108,6 +108,28 @@ func (server Server) currentColor(w http.ResponseWriter, r *http.Request) {
 	w.Write(jpg)
 }
 
+func (server Server) debug(w http.ResponseWriter, r *http.Request) {
+	if r.FormValue("URL") == "" {
+		return
+	}
+	w.Header().Set("Content-Type", "image/jpeg")
+	URL := r.FormValue("URL")
+
+	stream, exists := server.Streams[URL]
+	if !exists {
+		return
+	}
+	if !stream.DebugInstantPathExists() {
+		log.Println(stream.GetDebugInstantPath())
+		return
+	}
+	jpg, err := gocv.IMEncode(".jpg", stream.IMReadDebug())
+	if err != nil {
+		log.Fatal("Could not encode Mat to jpg:", URL)
+	}
+	w.Write(jpg)
+}
+
 func (server Server) current(w http.ResponseWriter, r *http.Request) {
 	if r.FormValue("URL") == "" {
 		return
@@ -158,5 +180,6 @@ func main() {
 	http.HandleFunc("/previous", server.previous)
 	http.HandleFunc("/current_color", server.currentColor)
 	http.HandleFunc("/current", server.current)
+	http.HandleFunc("/debug", server.debug)
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }
diff --git a/stream.go b/stream.go
index 59327a9..aaab6d2 100755
--- a/stream.go
+++ b/stream.go
@@ -63,7 +63,8 @@ func (s Stream) Update() {
 	diff := gocv.NewMat()
 	previousGrey := s.IMReadPrevious()
 	gocv.AbsDiff(previousGrey, currentGrey, &diff)
-	gocv.Threshold(diff, &diff, 10, 255, gocv.ThresholdBinary)
+	gocv.Threshold(diff, &diff, 50, 255, gocv.ThresholdBinary)
+	go gocv.IMWrite(s.GetDebugInstantPath(), diff)
 }
 
 // UpdateInterval calls Update() every interval
@@ -202,3 +203,18 @@ func (s Stream) NextInstantPathExists() bool {
 func (s Stream) IMReadNext() gocv.Mat {
 	return gocv.IMRead(s.GetNextInstantPath(), gocv.IMReadGrayScale)
 }
+
+// GetDebugInstantPath returns filepath.Join(s.GetStreamDirPath(), s.Base64, "debug.jpg")
+func (s Stream) GetDebugInstantPath() string {
+	return filepath.Join(s.GetStreamStoreDirPath(), "debug.jpg")
+}
+
+// DebugInstantPathExists returns FileExists(GetDebugInstantPath())
+func (s Stream) DebugInstantPathExists() bool {
+	return FileExists(s.GetDebugInstantPath())
+}
+
+// IMReadDebug returns gocv.IMRead(GetDebugInstantPath(), gocv.IMReadGrayScale)
+func (s Stream) IMReadDebug() gocv.Mat {
+	return gocv.IMRead(s.GetDebugInstantPath(), gocv.IMReadGrayScale)
+}
diff --git a/templates/stream.html b/templates/stream.html
index d34640d..b0f22b4 100755
--- a/templates/stream.html
+++ b/templates/stream.html
@@ -2,5 +2,6 @@
 {{define "content"}}
 <img src="/stream?URL={{.URL}}">
 <img src="/previous?URL={{.URL}}">
+<img src="/debug?URL={{.URL}}">
 <img src="/current?URL={{.URL}}">
 {{end}}
\ No newline at end of file