How do today's watermark cameras search for photos?

As a punching camera or an engineering camera, today's watermark cameras have this convenient photo search function. Open today's watermark camera App, click on My Team, enter the corresponding team, and click on "Workbench" to see "All Photos". After clicking, you can search the content of the watermark text and find the corresponding photo. As an engineering camera, there will be a need to search for photos. We searched for "hidden dangers" some time ago and saw the photos of hidden dangers taken during the previous inspection, which is very convenient to compare the rectification situation. You can also quickly locate the photo you want from thousands of photos.