A method of processing data from at least one spectrophotometer characterized by the steps of transferring the data from the spectrophotometer to a control processing unit, processing the data at the central processing unit, and transferring the processed data to the output device. More specifically, the present invention relates to a polymer formed from reactive components comprising at least one silicone component and at least one ionic component comprising at least one anionic group. The small region eliminating circuit compares a small region with four detection patterns, discriminates it as a region other than the feature -region if no match is found and causes a center pixel of a window of 33 pixels to have a logical value of zero.