Jupyter notebook to plot the JPEG and Laplacian sharpnesses of a z-stack of images. Users can use their own images or the example images used in the paper, manually judging a focused range. To recreate Figures 3 and 5, zea.zip and USAF.zip are required.  The path in the fourth cell should be changed to the input folder (either `zea/8` or `USAF/11` assuming `zea.zip` and `USAF.zip` are extracted into the corresponding folders).  The focused range is manually specified in the fifth cell.