Method for objective evaluation of the color and homogeneity of a surface, especially for evaluation and comparison of concrete facings, such that surfaces in different locations can be objectively compared

摘要

Method in which a digital photograph of a surface is recorded together with the light conditions at the time, reference zones are defined on the surface, the reflectance and color components of the reference zones are measured and the image is then subjected to a conversion such that the color components of each pixel are independent of operational conditions and normalized to laboratory conditions. The invention also relates to defining objective acceptability criteria for a surface as a function of initial specifications.