Where can I find the camera matrix params derived from the model for a given frame? about dense-head-pose-estimation HOT 2 CLOSED

Tetsujinfr commented on August 14, 2024

Where can I find the camera matrix params derived from the model for a given frame?

from dense-head-pose-estimation.

Comments (2)

Tetsujinfr commented on August 14, 2024

Ok so I guess this is
self._get_camera_matrix = partial(self._interpreter.get_tensor,
output_details[0]["index"])

in BaseTFLiteFaceAlignment ?

from dense-head-pose-estimation.

1996scarlet commented on August 14, 2024

Yes, we can get the camera_matrix R directly from the model output.

Dense-Head-Pose-Estimation/service/TFLiteFaceAlignment.py

Lines 29 to 30 in 60a5bdf

 self._get_camera_matrix = partial(self._interpreter.get_tensor, 

 output_details[0]["index"])

Dense-Head-Pose-Estimation/service/TFLiteFaceAlignment.py

Lines 75 to 82 in 60a5bdf

 def _postprocessing(self, M): 

 iM = cv2.invertAffineTransform(M) 

 R = self._get_camera_matrix()[0] 

 landmarks = self._decode_landmarks(iM) 

 return landmarks, R

Then, we can decompose matrix to ruler angle

Dense-Head-Pose-Estimation/service/__init__.py

Lines 101 to 111 in 60a5bdf

 def pose(frame, results, color): 

 landmarks, params = results 

 # rotate matrix 

 R = params[:3, :3].copy() 

 # decompose matrix to ruler angle 

 euler = rotationMatrixToEulerAngles(R) 

 print(f"Pitch: {euler[0]}; Yaw: {euler[1]}; Roll: {euler[2]};") 

 draw_projection(frame, R, landmarks, color)

from dense-head-pose-estimation.

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	self._get_camera_matrix = partial(self._interpreter.get_tensor,
	output_details[0]["index"])

	def _postprocessing(self, M):
	iM = cv2.invertAffineTransform(M)

	R = self._get_camera_matrix()[0]

	landmarks = self._decode_landmarks(iM)

	return landmarks, R

	def pose(frame, results, color):
	landmarks, params = results

	# rotate matrix
	R = params[:3, :3].copy()

	# decompose matrix to ruler angle
	euler = rotationMatrixToEulerAngles(R)
	print(f"Pitch: {euler[0]}; Yaw: {euler[1]}; Roll: {euler[2]};")

	draw_projection(frame, R, landmarks, color)

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