Shape from shading with variable albedo

Ping-sing Tsai; Mubarak Ali Shah

doi:10.1117/1.601957

Abstract

Most traditional shape-from-shading algorithms assume that an image contains only a single object with Lambertian surface and uniform albedo values. These algorithms perform poorly on images with nonuniform albedo values. In this paper, we first discuss a linear shape- from-shading method that employs discrete approximations for the surface normal using finite differences of the depth and linearizes the reflectance function in depth directly. Next we present a simple method to cancel the effect of albedo variation. In our approach, we first estimate the albedo values for each pixel, and segment the scene into regions with uniform albedo values. However, the estimated albedo values are not accurate at the points near edges, so we apply a modified median filter to improve the result. Then we adjust the intensity value for each pixel by dividing by the corresponding albedo value before applying the linear shape-from-shading method. Experimental results are presented for several synthetic and actual images.

Citation Download Citation

Ping-sing Tsai, Ping-sing Tsai, Mubarak Ali Shah, Mubarak Ali Shah, } "Shape from shading with variable albedo," Optical Engineering 37(4), (1 April 1998). https://doi.org/10.1117/1.601957 . Submission:

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $20.00

Non-members: $25.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years