About roll, yaw, pitch by Python implementaiton

[jerryhouuu]

Hello I follow your c++ code to implementation the pose estimation,
I want to get the face pose, range from +90 to -90, like the following picture

I use the six landmark and their world coordinate to get pose

image_points = np.array([
                            (landmarks[4], landmarks[5]),     # Nose tip
                            (landmarks[10], landmarks[11]),   # Chin
                            (landmarks[0], landmarks[1]),     # Left eye left corner
                            (landmarks[2], landmarks[3]),     # Right eye right corne
                            (landmarks[6], landmarks[7]),     # Left Mouth corner
                            (landmarks[8], landmarks[9])      # Right mouth corner
                        ], dtype="double")

    # 3D model points.
    model_points = np.array([
                            (0.0, 0.0, 0.0),             # Nose tip
                            (0.0, -330.0, -65.0),        # Chin
                            (-165.0, 170.0, -135.0),     # Left eye left corner
                            (165.0, 170.0, -135.0),      # Right eye right corne
                            (-150.0, -150.0, -125.0),    # Left Mouth corner
                            (150.0, -150.0, -125.0)      # Right mouth corner                         
                        ])

(success, rotation_vector, translation_vector) = cv2.solvePnP(model_points, image_points, camera_matrix, dist_coeffs, flags=cv2.CV_ITERATIVE)
rvec_matrix = cv2.Rodrigues(rotation_vector)[0]
proj_matrix = np.hstack((rvec_matrix, translation_vector))
eulerAngles = -cv2.decomposeProjectionMatrix(proj_matrix)[6] 
yaw   = eulerAngles[1]
pitch = eulerAngles[0]
roll  = eulerAngles[2]
if pitch > 0:
  pitch = 180 - pitch
elif pitch < 0:
  pitch = -180 - pitch
yaw = -yaw 

But I have some problem, each case(yaw, pitch, row) is correct, for example, In face roll case, roll is true, but, pitch is false(pitch range will almost 180). Could u give me some advise? Thanks.

[severin-lemaignan]

@jerryhouuu thank you for your question. This is however not an issue with gazr, so I'm closing the ticket.

Unfortunately, I do not have time now to help you with your own code.

[tataganesh95]

@jerryhouuu Hey. What did you use for landmark detection? dlib?