If for some applications, continuous broadcast of an image is needed, then the image packets can be transmitted at some very low rate in the background continuously. The APRS bandwidth just cannot support it. It should ONLY be used in specific high priority robotic or remote vision applications. The following images show you how the APRS Vision system works. FIrst you receive a small crude image in a single packet.
Subsequent packets add additional detail until the final resolution is reached.
There are 5 levels and each level requires 4 times the number of packets than the previous level. The first packet image at Level 1. Shown at one quarter size. It is 16x8 and 16 shades of gray. After 3 more packets the image is 32x16 and 16 shades.