Fig. 1. Lens-free on-chip microscope setup. (a) Schematic of lens-free on-chip microscopy. (b) Experimental lens-free on-chip microscope setup. (c) An example image of H&E stained pathological tumor tissue.

Fig. 2. Computational algorithm flowchart to get a virtually colorized lens-free on-chip microscopy image.

Fig. 3. Deep learning GAN established to achieve virtual colorization.

Fig. 4. Data processing to achieve virtual colorful lens-free on-chip microscopy. The yellow scale bar is 200 μm.

Fig. 5. Comparisons of lens-free on-chip microscopy image, bench-top commercial microscopy image, and virtual colorization image, which are image pairs of ROIs #1, #2, and #3 in Fig. 4.