《Table 1MSE comparison for the reprojected Beethoven images using PPN and PPS perspective methods》

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《Photometric stereo for strong specular highlights》

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In the second experiment using the Beethoven image set，we investigate the difference between the perspective approaches on a more complex real world object scene.Table 1 gives an MSE comparison of gray levels for the reprojected and input images.Since in this case the ground truth depth map is not available，we reconstruct the reprojected images by obtaining the gradient fields using the two perspective approaches and replace them in the Lambertian reflectance equation.Table 1shows that reprojecting from the PPS results closely matches the third input image，while the PPN approach better matches the first and second input images，especially the latter.As the reprojected images in Fig.6 show，the difference between these methods as given in Table 1 can be quite significant.Furthermore，it is indicative of higher sensitivity of the PPS method to the lightening than the PPN approach.