A family of Microsoft relational database management systems designed for ease of use.
I do something very much like this with my family's image gallery website.
Scott is right, it isn't necessarily an automatic process, but you can automate the import of information about image files into the database, and you could set that up to run whenever the relational database application opens. I wouldn't do that because I'd want to control when it happens, but you certainly could.
I find the loading of images into an image control on a single view form to be very, very fast. If you are planning to display a series of records on a continuous form, though, it might be more noticeable, but I would not worry too much about it unless and until you find it does matter in your case.
I recently created a similar sample demo for another task, and it's pretty straightforward to adapt it to find all image files in a given folder. I will place it on my OneDrive Public Site. To use it, start by placing the appropriate file path in the file path table.