Fix #4: Allow to set maxAge and IoUThreshold

README.md

@@ -31,8 +31,10 @@ yarn add sort-node@npm:@techainer1t/sort-node
 
 The `sort-node` package contain the object `SortNode` that can be use to track object detected from a single video or camera.
 
-The `SortNode` object can be initialize with 2 arguments:
-- `kMinHits`: (int) Minimum number of hits before a bounding box was assigned a new track ID
+The `SortNode` object can be initialize with 4 arguments in the following order:
+- `kMinHits`: (int) Minimum number of hits before a bounding box was assigned a new track ID (should be 3)
+- `kMaxAge`: (int) Maximum number of frames to keep alive a track without associated detections
+- `kIoUThreshold`: (float between 0 and 1) Minimum IOU for match (should be 0.3)
 - `kMinConfidence`: (float between 0 and 1) Bouding boxes with confidence score less than this value will be ignored
 
 With each frame, you will need to call `update` method.
@@ -53,8 +55,10 @@ Please noted that the number of returned object might not be the same as the num
 ```javascript
 const sortnode = require("@techainer1t/sort-node");
 const kMinHits = 3;
+const kMaxAge = 1;
+const kIoUThreshold = 0.3;
 const kMinConfidence = 0.3;
-const tracker = sortnode.SortNode(kMinHists, kMinConfidence);
+const tracker = sortnode.SortNode(kMinHits, kMaxAge, kIoUThreshold, kMinConfidence);
 while (true){
     // Call the object detector
     ...

include/tracker.h

@@ -33,7 +33,7 @@ class Tracker {
                                               std::vector<std::pair<cv::Rect, std::vector<float>>> &unmatched_det,
                                               float iou_threshold = 0.3);
 
-    void Run(const std::vector<std::pair<cv::Rect, std::vector<float>>> &detections);
+    void Run(const std::vector<std::pair<cv::Rect, std::vector<float>>> &detections, int kMaxAge, float kIoUThreshold);
 
     std::map<int, Track> GetTracks();
 

package.json

@@ -18,7 +18,7 @@
   },
   "name": "@techainer1t/sort-node",
   "description": "Node binding of SORT: Simple, online, and real-time tracking of multiple objects in a video sequence.",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "directories": {
     "doc": "docs"
   },

src/sort_node.cc

@@ -22,9 +22,9 @@ namespace sortnode
         Napi::Env env = info.Env();
         Napi::HandleScope scope(env);
 
-        if (info.Length() < 2 || info.Length() > 2)
+        if (info.Length() < 4 || info.Length() > 4)
         {
-            Napi::TypeError::New(env, "SortTracker constructor received wrong number of arguments: kMinHits, kMinConfidence")
+            Napi::TypeError::New(env, "SortTracker constructor received wrong number of arguments, expect: kMinHits, kMaxAge, kIoUThreshold, kMinConfidence")
                 .ThrowAsJavaScriptException();
             return;
         }
@@ -37,22 +37,46 @@ namespace sortnode
         }
 
         auto kMinHits = info[0].As<Napi::Number>().DoubleValue();
-        if (fmod(kMinHits, 1) != 0)
+        if (fmod(kMinHits, 1) != 0 || kMinHits < 0)
         {
-            Napi::TypeError::New(env, "kMinHits must be an interger")
+            Napi::TypeError::New(env, "kMinHits must be an interger greater than 0")
+                .ThrowAsJavaScriptException();
+            return;
+        }
+
+        if (!info[1].IsNumber())
+        {
+            Napi::TypeError::New(env, "kMaxAge must be an interger")
+                .ThrowAsJavaScriptException();
+            return;
+        }
+
+        auto kMaxAge = info[1].As<Napi::Number>().DoubleValue();
+        if (fmod(kMaxAge, 1) != 0 || kMaxAge < 0)
+        {
+            Napi::TypeError::New(env, "kMaxAge must be an interger greater than 0")
+                .ThrowAsJavaScriptException();
+            return;
+        }
+
+        if (!info[2].IsNumber() || info[2].As<Napi::Number>().DoubleValue() > 1 || info[2].As<Napi::Number>().DoubleValue() < 0)
+        {
+            Napi::TypeError::New(env, "kIoUThreshold must be a float between 0 and 1")
                 .ThrowAsJavaScriptException();
             return;
         }
 
-        if (!info[1].IsNumber() || info[1].As<Napi::Number>().DoubleValue() > 1 || info[1].As<Napi::Number>().DoubleValue() < 0)
+        if (!info[3].IsNumber() || info[3].As<Napi::Number>().DoubleValue() > 1 || info[3].As<Napi::Number>().DoubleValue() < 0)
         {
             Napi::TypeError::New(env, "kMinConfidence must be a float between 0 and 1")
                 .ThrowAsJavaScriptException();
             return;
         }
 
         this->kMinHits = int(kMinHits);
-        this->kMinConfidence = float(info[1].As<Napi::Number>().DoubleValue());
+        this->kMaxAge = int(kMaxAge);
+        this->kIoUThreshold = float(info[2].As<Napi::Number>().DoubleValue());
+        this->kMinConfidence = float(info[3].As<Napi::Number>().DoubleValue());
     }
 
     Napi::Value SortNode::update(const Napi::CallbackInfo& info)
@@ -136,7 +160,7 @@ namespace sortnode
         }
 
         // Run SORT tracker
-        this->tracker.Run(bbox_per_frame);
+        this->tracker.Run(bbox_per_frame, this->kMaxAge, this->kIoUThreshold);
         const auto tracks = this->tracker.GetTracks();
 
         // Convert results from cv::Rect to normal float vector

src/sort_node.h

@@ -13,7 +13,9 @@ namespace sortnode
     {
     public:
         int kMinHits = 3;
+        int kMaxAge = 1;
         int kMaxCoastCycles = 1;
+        float kIoUThreshold = 0.3;
         float kMinConfidence = 0.6;
         int frame_index = 0;
         Tracker tracker;

src/tracker.cpp

@@ -135,7 +135,7 @@ void Tracker::AssociateDetectionsToTrackers(const std::vector<std::pair<cv::Rect
 }
 
 
-void Tracker::Run(const std::vector<std::pair<cv::Rect, std::vector<float>>>& detections) {
+void Tracker::Run(const std::vector<std::pair<cv::Rect, std::vector<float>>>& detections, int kMaxAge, float kIoUThreshold) {
 
     /*** Predict internal tracks from previous frame ***/
     for (auto &track : tracks_) {
@@ -149,7 +149,7 @@ void Tracker::Run(const std::vector<std::pair<cv::Rect, std::vector<float>>>& de
 
     // return values - matched, unmatched_det
     if (!detections.empty()) {
-        AssociateDetectionsToTrackers(detections, tracks_, matched, unmatched_det);
+        AssociateDetectionsToTrackers(detections, tracks_, matched, unmatched_det, kIoUThreshold);
     }
 
     /*** Update tracks with associated bbox ***/
@@ -168,7 +168,7 @@ void Tracker::Run(const std::vector<std::pair<cv::Rect, std::vector<float>>>& de
 
     /*** Delete lose tracked tracks ***/
     for (auto it = tracks_.begin(); it != tracks_.end();) {
-        if (it->second.coast_cycles_ > kMaxCoastCycles) {
+        if (it->second.coast_cycles_ > kMaxAge) {
             it = tracks_.erase(it);
         } else {
             it++;

test/test_binding.js

@@ -7,8 +7,10 @@ assert(sortnode.SortNode, "The expected module is undefined");
 function testBasic() {
     console.log("Running testBasic");
     const kMinHits = 3;
+    const kMaxAge = 1;
     const kMinConfidence = 0.3;
-    const instance = new sortnode.SortNode(kMinHits, kMinConfidence);
+    const kIoUThreshold = 0.3;
+    const instance = new sortnode.SortNode(kMinHits, kMaxAge, kIoUThreshold, kMinConfidence);
     assert(instance.update, "The expected method is not defined");
 }
 
@@ -63,7 +65,7 @@ function testAccuracyWithoutLandmark() {
 
     const total_frames = all_detections.length;
 
-    const tracker = new sortnode.SortNode(3, 0.6);
+    const tracker = new sortnode.SortNode(3, 1, 0.3, 0.6);
     let frame_index = 0
     let predicted = [];
     const t1 = Date.now()
@@ -98,7 +100,7 @@ function testAccuracyWithoutLandmark() {
 
 function testKeepLandmark(){
     console.log("Running testKeepLandmark")
-    const tracker = new sortnode.SortNode(3, 0.3);
+    const tracker = new sortnode.SortNode(3, 1, 0.3, 0);
 
     let input = [
         [120, 240, 50, 70, 0.9, 23, 24, 25, 26, 27, 28, 29, 30],