diff --git a/dist/index.js b/dist/index.js
index 32b4e49..a26c394 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -22992,7 +22992,15 @@ var start = async function start(element, video, canvas) {
       _ref$model = _ref.model,
       model = _ref$model === undefined ? null : _ref$model,
       _ref$modelParams = _ref.modelParams,
-      modelParams = _ref$modelParams === undefined ? {} : _ref$modelParams;
+      modelParams = _ref$modelParams === undefined ? {} : _ref$modelParams,
+      _ref$transform = _ref.transform,
+      transform = _ref$transform === undefined ? function (prediction, video, target) {
+    return {
+      x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) / video.width * target.offsetWidth + target.offsetLeft,
+      y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) / video.height * target.offsetHeight + target.offsetTop,
+      target: target
+    };
+  } : _ref$transform;
 
   modelParams = _extends({
     flipHorizontal: true, // flip e.g for video
@@ -23015,29 +23023,17 @@ var start = async function start(element, video, canvas) {
 
       if (lastPredictions.length === 0 && predictions.length > 0) {
         touches = predictions.map(function (prediction) {
-          return {
-            x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) / videoWidth * element.offsetWidth + element.offsetLeft,
-            y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) / videoHeight * element.offsetHeight + element.offsetTop,
-            target: element
-          };
+          return transform(prediction, video, element);
         });
         Simulator.events.touch.trigger(touches, touches[0].target, 'start');
       } else if (predictions.length === 0 && lastPredictions.length > 0) {
         touches = lastPredictions.map(function (prediction) {
-          return {
-            x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) / videoWidth * element.offsetWidth + element.offsetLeft,
-            y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) / videoHeight * element.offsetHeight + element.offsetTop,
-            target: element
-          };
+          return transform(prediction, video, element);
         });
         Simulator.events.touch.trigger(touches, touches[0].target, 'end');
       } else if (predictions.length > 0) {
         touches = predictions.map(function (prediction) {
-          return {
-            x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) / videoWidth * element.offsetWidth + element.offsetLeft,
-            y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) / videoHeight * element.offsetHeight + element.offsetTop,
-            target: element
-          };
+          return transform(prediction, video, element);
         });
         Simulator.events.touch.trigger(touches, touches[0].target, 'move');
       }
diff --git a/examples/visual.html b/examples/visual.html
index f46b4b4..f601718 100644
--- a/examples/visual.html
+++ b/examples/visual.html
@@ -218,7 +218,16 @@
     var canvas = document.getElementById("handtrackjs").getElementsByTagName("canvas")[0];
     const context = canvas.getContext("2d");
 
-    HandtrackTouch.start(el, video, canvas);
+    var options = {
+        transform: function (prediction, video, target) {
+            return {
+                x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) / video.width * 1920,
+                y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) / video.height * 1200,
+                target: target,
+            };
+        }
+    };
+    HandtrackTouch.start(el, video, canvas, options);
 
 </script>
 </body>
diff --git a/src/index.js b/src/index.js
index 1d2ca4c..e6cfb79 100644
--- a/src/index.js
+++ b/src/index.js
@@ -5,6 +5,13 @@ require('../node_modules/hammer-simulator/index.js');
 const start = async (element, video, canvas, {
   model = null,
   modelParams = {},
+  transform = (prediction, video, target) => ({
+    x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) /
+        video.width * target.offsetWidth + target.offsetLeft,
+    y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) /
+        video.height * target.offsetHeight + target.offsetTop,
+    target: target,
+  }),
 } = {}) => {
   modelParams = {
     flipHorizontal: true,   // flip e.g for video
@@ -22,6 +29,7 @@ const start = async (element, video, canvas, {
   const videoWidth = video.width;
   const videoHeight = video.height;
 
+
   let lastPredictions = [];
   let touches = [];
   function runDetection() {
@@ -29,31 +37,16 @@ const start = async (element, video, canvas, {
       model.renderPredictions(predictions, canvas, context, video);
 
       if (lastPredictions.length === 0 && predictions.length > 0) {
-        touches = predictions.map(prediction => ({
-          x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) /
-              videoWidth * element.offsetWidth + element.offsetLeft,
-          y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) /
-              videoHeight * element.offsetHeight + element.offsetTop,
-          target: element,
-        }));
+        touches = predictions.map(prediction =>
+          transform(prediction, video, element));
         Simulator.events.touch.trigger(touches, touches[0].target, 'start');
       } else if (predictions.length === 0 && lastPredictions.length > 0) {
-        touches = lastPredictions.map(prediction => ({
-          x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) /
-              videoWidth * element.offsetWidth + element.offsetLeft,
-          y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) /
-              videoHeight * element.offsetHeight + element.offsetTop,
-          target: element,
-        }));
+        touches = lastPredictions.map(prediction =>
+          transform(prediction, video, element));
         Simulator.events.touch.trigger(touches, touches[0].target, 'end');
       } else if (predictions.length > 0) {
-        touches = predictions.map(prediction => ({
-          x: (prediction.bbox[0] + 0.5 * prediction.bbox[2]) /
-              videoWidth * element.offsetWidth + element.offsetLeft,
-          y: (prediction.bbox[1] + 0.5 * prediction.bbox[3]) /
-              videoHeight * element.offsetHeight + element.offsetTop,
-          target: element,
-        }));
+        touches = predictions.map(prediction =>
+          transform(prediction, video, element));
         Simulator.events.touch.trigger(touches, touches[0].target, 'move');
       }
       lastPredictions = predictions;