1. Brooks, M.J., Horn, B.K.P.: Shape and source from shading. Image Proceedings, Int. Joint Conf. Artif. Intell., Los Angeles, pp. 932–936. Morgan Kaufmann, Montreal, Quebec, Canada (1985)
2. Chen, Y., Wang, H., Wang, Y.: Pyramid surface reconstruction from normal. In: Proc. of the Third International Conference on Image and Graphics (ICIG’04), pp. 464–467. IEEE Computer Society, Hongkong, China (2004)
3. Collings, S.P., Kozera, R.S., Noakes, L.: A piecewise quadratic approach to single image shape from shading. 16th Int. Conf. on Pattern Recog., Los Alamitos, California. IEEE Comput. Soc. 4, 126–129 (2002)
4. Daniel, P., Durou, J.D.: From Deterministic to Stochastic Methods for Shape from Shading. In: Proc. of the 4th Asian Conference on Computer Vision, pp. 187–192. IEEE Computer Society, Taipei, Taiwan (2000)
5. Durou, J.D., Falcone, M., Sagona, M.: A survey of numerical methods for shape from shading, IRIT University Technical Report (2004)