METHOD FOR EVALUATING CONTAMINATION OF OBJECT SURFACE AND IMAGING BOX USED FOR THIS METHOD

摘要

A contamination evaluation method for evaluating a contamination state of a surface of an object such as a wall and a widow glass by quantifying the contamination with a numeric analogous to human sense image. The method includes a step of imaging the surface of the object, a step of converting color image data representing an imaged color image into monochromatic image data, a step of dividing the monochromatic image represented by monochromatic data into dot matrix, a step of calculating luminance of each dot, a step of selecting a portion to be evaluated on the dot matrix, and a step of calculating standard deviation of the luminance distribution from the luminance distribution of the selected portion.