feat(v2): add fall event regression engine

v2/internal/pose/postprocess_test.go

@@ -0,0 +1,45 @@
+package pose
+
+import "testing"
+
+func TestParseYOLOv8PoseRestoresCoordinatesAndSuppressesOverlap(t *testing.T) {
+	output := make([]float32, YOLOPoseOutputValues)
+	putDetection(output, 0, 320, 320, 100, 200, 0.90, 330, 340)
+	putDetection(output, 1, 322, 321, 100, 200, 0.80, 332, 341)
+
+	people, err := ParseYOLOv8Pose(output, LetterboxTransform{Scale: 1}, 0.25, 0.70)
+	if err != nil {
+		t.Fatalf("ParseYOLOv8Pose returned an error: %v", err)
+	}
+	if len(people) != 1 {
+		t.Fatalf("people = %d, want one NMS survivor", len(people))
+	}
+	person := people[0]
+	if person.Box != (Box{Left: 270, Top: 220, Right: 370, Bottom: 420}) {
+		t.Fatalf("box = %+v", person.Box)
+	}
+	if point := person.Keypoints[0]; point.X != 330 || point.Y != 340 || point.Confidence != 0.9 {
+		t.Fatalf("first keypoint = %+v", point)
+	}
+}
+
+func TestParseYOLOv8PoseRejectsUnexpectedOutputLength(t *testing.T) {
+	_, err := ParseYOLOv8Pose([]float32{0}, LetterboxTransform{Scale: 1}, 0.25, 0.70)
+	if err == nil {
+		t.Fatal("ParseYOLOv8Pose accepted a malformed output")
+	}
+}
+
+func putDetection(output []float32, candidate int, centerX, centerY, width, height, confidence, keypointX, keypointY float32) {
+	output[0*YOLOPoseCandidateCount+candidate] = centerX
+	output[1*YOLOPoseCandidateCount+candidate] = centerY
+	output[2*YOLOPoseCandidateCount+candidate] = width
+	output[3*YOLOPoseCandidateCount+candidate] = height
+	output[4*YOLOPoseCandidateCount+candidate] = confidence
+	for keypoint := 0; keypoint < YOLOPoseKeypointCount; keypoint++ {
+		base := 5 + keypoint*3
+		output[(base+0)*YOLOPoseCandidateCount+candidate] = keypointX
+		output[(base+1)*YOLOPoseCandidateCount+candidate] = keypointY
+		output[(base+2)*YOLOPoseCandidateCount+candidate] = 0.9
+	}
+}