Soft Edge And Black Level Explained - Barco MCM-400 HFR User Manual

10.2.1 Soft Edge and Black Level explained

Soft Edge and Black Level principle
To achieve a seamless multiple channel image on one single large screen, we can make the adjacent images from two or more
projectors overlap in part. In the overlap areas where the image of two channels is joined, we find twice the brightness, so we need
to apply a gradual feather or Soft Edge blending on both channels to reduce the higher brightness to normal. This Soft Edge blending
can be realized with photographic plates put in front of the projection lens (especially used in case of dark sceneries) or with the
Electronic Soft Edge Matching (ESEM) feature of the projector (especially used in case of bright images).
Image with hard edge
Image 10-25
Example: Soft edge blending
Light output
Image 10-26
Without Soft Edge
Light output
Image 10-27
With Soft Edge
Next to blending, Soft Edge can also be used to blank parts of the image. This turns out to be extremely useful in applications where
mechanical constructions are blocking a part of the image (e.g. cockpit, mechanical supports, etc.).
Finally it is possible to match "full black" in the non overlap areas to "full black" in the overlap areas by making it a little brighter.
R5909056 MCM-400 HFR 11/05/2016
Image without soft edge
adjustment
Channel 1
Channel 1+2
Channel 1
Channel 1
Channel 1+2
Channel 1
Image with soft edge
Channel 2
Channel 2
Channel 2
Channel 2
10. Expert operation
adjustment
125