Figure 5
From: Smartphone-based multi-contrast microscope using color-multiplexed illumination
Image distortion correction. (a,b) Color image of a binary grid pattern and node positions found in the distortion-uncorrected case. The red stars and blue squares represent the node positions for red and blue LED illuminations, respectively. It is apparent that the node positions are not co-located for each color, especially in the edge of the field of view. (c,d) Image of the grid pattern and node positions after the distortion correction. The node positions for each color are well co-located. Insets in (c) and (d) are the magnified view of the node positions in the top right region of the field of view.
