User`s guide

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Edge blending

Introduction

Edge Blending is a companion feature to Image Geometry Correction. Edge Blending

enables the seamless projection of a large image using several overlapping projectors. Since

geometry correction for projection on non-ﬂ at surfaces is a built-in requirement in almost all

Edge Blending systems, the pairing of Edge Blending and Image Geometry Correction in the

same video signal processor is a natural one.

Edge blending algorithms

MIPS support two different types of edge blending: Basic and Advanced

Basic edge blending

Basic edge blending is used for simple and slightly curved surfaces. A percentage or a

deﬁ ned number of overlapping pixels is speciﬁ ed. The overlapping region of each side (top,

bottom, left, right) of the image is then geometry corrected with the warping that is being

applied to the image.

Advanced edge blending

Advanced edge blending is used for more complex surfaces like a dome (spherical). With

advanced edge blending, warping and blending is completely disconnected. After correct

geometry correction has been applied, multiple blend areas are deﬁ ned to create the

seamless image.

User interface for basic edge blending

To apply basic edge blending to an image, select “Blend” from the left hand toolbar, and

select Basic Blend Setup. The window in Figure 8-25 will appear.