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Color analysis has been essential for the interpretation of optical readouts, e.g. colorimetry, fluorescence, spectroscopy, and scanometry. However, existing colorimetric readers can hardly eliminate the color interference of colored solutions, e.g., interpreting pH test strips to assess the pH value of red wine. This paper introduces a smartphone modulated colorimetric reader that is compatible with most smartphone models and a novel color subtraction algorithm that eliminates color interferences due to colored solutions. Experiments were conducted to validate the effectiveness of the developed reader and algorithm on evaluating pH test strips produced from transparent and colored solutions using multiple smartphone models. Applicability of the developed reader was demonstrated through its interpretation of pH test strips measuring pH values of colored and non-transparent food samples including red wine and milk.

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Bleeding Enhanced Image Scribble Color Bleeding Enhanced Image Scribble Figure 1: Qualitative results of edge enhancement by using our proposed method. These images are collected from https: //unsplash.com. The first and the fourth columns show samples containing color-bleeding artifacts. Yellow boxes represent color-bleeding regions. The second and the fifth columns have edge-enhanced samples by our proposed method. The scribbles which are used to enhance the color-bleeding artifacts are shown in the third and the sixth columns.