Normally the image intensity is the combination of specular and diffuse reflection. I have single gray scale image and want to separate the these two component. Under the lambertian assumption the intensity is the dot product of normal and light source with constant albedo. My question is how to estimate direction of light source from single gray scale image. Second, under the assumption of non-lambertian, intensity is the linear combination of specular and diffuse component. Now how to estimate the specularity from single gray scale image??
If you write the expanded version of the rendering equation for all pixels, could you optimize it for light source direction, so that the equation produces the given pixels?
We use a virtual light stage, but we have an estimation of geometry. Do you have or plan to estimate geometry? Or is it possible to make a hard assumption on surface normals? Is interaction allowed?
Also, have you seen this: "Specularity removal in images and videos"; SP Mallick, T Zickler, PN Belhumeur; ECCV 2006
I am not sure it's possible to estimate this from only a single greyscale image. You will need extra information, such as:
- Multiple images (stereoscopic vision)
- Color
- Multispectral
- Depth imaging
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