To get a better understanding of the Image Retrieval System this section will explain some basic concepts that will be useful for the usage of the Image Retrieval System.
Figure 1 explains what we mean by a label. The labels are the strings to the left and right of the image (figure 1a). An image can have several labels and the same label can be on several different images.
Look at figure 1b to see what we mean by outlines

The search engine is a simple string-matching algorithm that searches all the labels from the image database. The image database is a collection of all labels from the Digital Atlas