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#include "mediapipe/calculators/ims/eye_aspect_ratio_calculator.h"
#include "mediapipe/framework/port/ret_check.h"
#include "mediapipe/framework/port/status.h"
#include <cmath>
namespace mediapipe {
using mediapipe::NormalizedLandmarkList;
using mediapipe::NormalizedLandmark;
absl::Status EyeAspectRatioCalculator::GetContract(CalculatorContract* cc) {
cc->Inputs().Tag("LANDMARKS").Set<NormalizedLandmarkList>();
cc->Outputs().Tag("LEFT_EAR").Set<float>();
cc->Outputs().Tag("RIGHT_EAR").Set<float>();
cc->Outputs().Tag("AVG_EAR").Set<float>();
cc->Options<EyeAspectRatioOptions>();
return absl::OkStatus();
}
absl::Status EyeAspectRatioCalculator::Open(CalculatorContext* cc) {
const auto& options = cc->Options<EyeAspectRatioOptions>();
left_eye_upper_.assign(options.left_eye_upper().begin(),
options.left_eye_upper().end());
left_eye_lower_.assign(options.left_eye_lower().begin(),
options.left_eye_lower().end());
left_eye_left_ = options.left_eye_left();
left_eye_right_ = options.left_eye_right();
right_eye_upper_.assign(options.right_eye_upper().begin(),
options.right_eye_upper().end());
right_eye_lower_.assign(options.right_eye_lower().begin(),
options.right_eye_lower().end());
right_eye_left_ = options.right_eye_left();
right_eye_right_ = options.right_eye_right();
closed_threshold_ = options.closed_threshold();
LOG(INFO) << "EyeAspectRatioCalculator initialized";
LOG(INFO) << " Left eye indices: upper=" << left_eye_upper_.size()
<< ", lower=" << left_eye_lower_.size();
LOG(INFO) << " Right eye indices: upper=" << right_eye_upper_.size()
<< ", lower=" << right_eye_lower_.size();
LOG(INFO) << " Closed threshold: " << closed_threshold_;
return absl::OkStatus();
}
absl::Status EyeAspectRatioCalculator::Process(CalculatorContext* cc) {
if (cc->Inputs().Tag("LANDMARKS").IsEmpty()) {
LOG(WARNING) << "Empty landmarks input at timestamp: " << cc->InputTimestamp();
return absl::OkStatus();
}
const auto& landmarks = cc->Inputs().Tag("LANDMARKS").Get<NormalizedLandmarkList>();
if (landmarks.landmark_size() < 468) {
LOG(WARNING) << "Insufficient landmarks: " << landmarks.landmark_size();
return absl::OkStatus();
}
float left_ear = CalculateEAR(landmarks, left_eye_upper_, left_eye_lower_,
left_eye_left_, left_eye_right_);
float right_ear = CalculateEAR(landmarks, right_eye_upper_, right_eye_lower_,
right_eye_left_, right_eye_right_);
float avg_ear = (left_ear + right_ear) / 2.0f;
avg_ear = SmoothEAR(avg_ear);
cc->Outputs().Tag("LEFT_EAR").AddPacket(
MakePacket<float>(left_ear).At(cc->InputTimestamp()));
cc->Outputs().Tag("RIGHT_EAR").AddPacket(
MakePacket<float>(right_ear).At(cc->InputTimestamp()));
cc->Outputs().Tag("AVG_EAR").AddPacket(
MakePacket<float>(avg_ear).At(cc->InputTimestamp()));
VLOG(1) << "EAR: left=" << left_ear << ", right=" << right_ear
<< ", avg=" << avg_ear;
return absl::OkStatus();
}
float EyeAspectRatioCalculator::CalculateEAR(
const NormalizedLandmarkList& landmarks,
const std::vector<int>& upper_indices,
const std::vector<int>& lower_indices,
int left_index,
int right_index) {
float vertical_sum = 0.0f;
for (size_t i = 0; i < upper_indices.size(); ++i) {
vertical_sum += Distance(landmarks.landmark(upper_indices[i]),
landmarks.landmark(lower_indices[i]));
}
float vertical_avg = vertical_sum / upper_indices.size();
float horizontal = Distance(landmarks.landmark(left_index),
landmarks.landmark(right_index));
if (horizontal < 1e-6f) {
LOG(WARNING) << "Horizontal distance too small: " << horizontal;
return 0.0f;
}
return vertical_avg / horizontal;
}
float EyeAspectRatioCalculator::Distance(const NormalizedLandmark& p1,
const NormalizedLandmark& p2) {
float dx = p1.x() - p2.x();
float dy = p1.y() - p2.y();
float dz = p1.z() - p2.z();
return std::sqrt(dx * dx + dy * dy + dz * dz);
}
float EyeAspectRatioCalculator::SmoothEAR(float current_ear) {
ear_history_.push_back(current_ear);
while (ear_history_.size() > smooth_window_size_) {
ear_history_.pop_front();
}
float sum = 0.0f;
for (float ear : ear_history_) {
sum += ear;
}
return sum / ear_history_.size();
}
REGISTER_CALCULATOR(EyeAspectRatioCalculator);
}
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