InspectJ is a free ImageJ/FIJI tool to inspect digital image integrity.
InspectJ_v2 is a newer version for advanced users. It applies additional features like histogram equalization and gamma correction for improved image inspections.
An ImageJ plugin for selecting a plane in focus among multiple slices image stack. The algorithm uses normalized variance. A short tutorial is available in the plugin web page (above).
The SSIM is an index measuring the structural similarity between two images. It is valued between -1 and 1. When two images are nearly identical, their SSIM is close to 1.
