The cement-based decorative mortar is a kind of good finishing material because of its abundant shape and wide range of colour change,with efflorescence.The lack of characterization methods of efflorescence degree seriously hinders the further research and application of cement-based decorative mortar.In this paper,the characterization methods of the efflorescence degree of decorative mortar was studied by image processing technology.The results show that the effects of colours in different grey scales on mortar appearance can be distinguished by the image processing techniques,and colours in efflorescence region would be obviously affected when their grey scales were 15 higher than that of matrix colour.Furthermore,the functional is proposed which was proposed could not only quantitative feature the efflorescence degree well buthad a good conformance with theactual value.
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