Question: Can anyone refer me the Phong reflection model parameters for a face image taken for web-cam?


I am doing 3D reconstruction of 2D images using 3D Morphable Model as in this paper Vetter & Blanz, 2003.

There is a cost function which needs to be optimized using Newton Method. I need to give initialization values for the Newton method.

The below equation is the phong reflection model of an image. The ambient, diffuse and the specualr components are shown.

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Phong Reflection Model wiki

Phong Parameters: Ks, Kd, Ka, α, Lm, V

I am estimating the above parameters using Newton method. The image is of human face and the camera is web-cam.

I gave the below values: Ks = Kd = Ka = 0.6 α = 5 Lm = [0 1 1] V = [0 0 1]

Can anyone comment on the above values and what can be a good initialization values for the parameters??


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