Bezel correction is the term used to accommodate for the molding around the screens glass display that holds the panel together. Every screen manufacture has different size bezel for their screens.
The size of the bezel can be different on the top, bottom and sides of the screen.
If the screens are arranged directly beside each other, the media will appear to “skip” the bezel region of the screen possibly distorting the media.
For example, without bezel correct a round object in media, spanning multiple screens may not appear round but will have extra space making the object larger. The bezel correction can compensate for this effect by cutting out the video “behind” the bezel, causing a round object to actually appear round.
The total canvas size should also include any correction for the size of the screen bezels. Since all the measurements of the canvas are in pixels, the number of pixels used by the bezel will have to be calculated.
Bezel correction is only required on the “inside” portions of the screens as the content will usually not extend past the outside portion of the screens into the outside bezel.