There are various solutions to achieve above mentioned processes, but they can be grouped into two main types: non-PC solution, or sometimes called stand-alone or solid-state solution; and PC solution or sometimes called media servers.

PC solution is a software application run on a PC.  You use the software to control the image.  The most critical thing that you need to be aware of is that there are usually high demands on PC hardware specifications in order to properly perform these complicated functionalities. For example, in order to action the overlap setting, the graphics cards must have the capability to properly crop and create overlap images- possibly not achievable using generic graphic cards and only with high-end ones, and they are usually much more expensive. Furthermore, multiple outputs graphic card (or multiple graphic cards) are needed in order to utilize multiple outputs to multiple projectors. The total cost of PC hardware plus software therefore might be quite high.

The non-PC solution is a solid state, stand alone, pure hardware solution. There can be two options for non-PC solutions.  First, you can use a video wall controller to crop the image into multiple pieces then output them to multiple projectors. The projectors must have the functionalities of geometric alignment and edge blending.  Another option is to use an all-in-one edge blending controller, sometimes called an edge-blending box.  An edge blendeing controller facilitates all the processes, including video wall settings, geometric alignment and edge blending and some of them even come with advanced features, like multi-viewer or 3D projection mapping.  The GeoBox edge blending box is the most typical non-PC solution. 

💡Read: Reliable Hardware-Based Video Processing for Professional AV Installations

Below we list a comparison between PC solutions and non-PC solutions: