Some questions

[wwdok]

Hi, @amitt1236, your implementation of gaze estimation is the most accurate I have seen so far ! After studied the code, I have some questions:

1. I run the code on my computer, and output the result to a video below:
   https://streamja.com/49vwG
   As shown in the video, my thicker red line jitters a lot, so do you apply some smooth strategy to the gaze point ?

2. Your code have provided some standard face 3d modol points like model_points and Eye_ball_center_left, how do you get these coordinates ? I am thinking if I change the coordinate system like rotate along z axis:
   
   (Actually this is the first time I use blender)
   How can get the new coordiantes of these points ?

[amitt1236]

1. I didn't use any smoothening, But if you combine the data from the two eyes you will get better accuracy, you can look
   at my vision_physiology repo for a simple example.

2. The nose is the reference point (0,0,0), and the Z-axis is the depth. Try looking at my points for refrence. And Cool thinking using blender.
   The eyeball center uses eye-physiology, the distance from the cornea to the eyeball Center, there is some great
   medicine papers about it. The distnce is practicly the same in most humans.
   you can try and use diffrent sets of points with different scaling.

Good luck

[wwdok]

1. Thanks for your sharing !
2. In the code, we use following coordinates(x,y,z) of standard human face's 6 landmarks:

model_points = np.array([
        (0.0, 0.0, 0.0),  # Nose tip
        (0, -63.6, -12.5),  # Chin
        (-43.3, 32.7, -26),  # Left eye, left corner
        (43.3, 32.7, -26),  # Right eye, right corner
        (-28.9, -28.9, -24.1),  # Left Mouth corner
        (28.9, -28.9, -24.1)  # Right mouth corner
    ])

Take the chin for example, its proportion between y and z is 63.6/12.5=5.088
But I measure the chin coordinate in blender, its proportion is 8.9402/3.3221=2.691

Then I verify the proportion in 2d plane with square, it seems its proportion is closer to 2.691

The model in blender I used is
canonical_face_mesh.zip
I am thinking whether if these coordinates are measured with another human face 3d model , I am curious where those coordinates in model_points come from ?

[amitt1236]

The proportion to a single point can change if you use a different model. The important part is that all the proportions change in the same way. Try your points, start with only head pose calculation and continue from there