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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Smartphone-Based Dual-Modality Imaging System for Quantitative Detection of Color or Fluorescent Lateral Flow Immunochromatographic Strips

Fig. 5

a Comparison of three time-consuming algorithms (Sobel algorithm, improved Sobel convolution operator, and Hough transformation). b Binarization images through five algorithms (improved Sobel convolution operator algorithm, Sobel algorithm, Prewitt algorithm, Log algorithm, and Roberts algorithm). c, d The smartphone screenshots which displayed the boundary coordinates. c Two methods for obtaining the left and right coordinates (left_x and right_x the same as the ic and id). d The coordinates of the test line and control line (T_line_y1, T_line_y2, C_line_y1 and C_line_y2 same as the t1, t2, c1 and c2). The paint software was developed by our research group in android operating system

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