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To describe the process of geometric correction in greater detail, we have taken the example of projecting onto a curved surface.

Unusual projection applications onto custom designed screensįigure 1: An example of a cylindrical correction.įigure 2: An example of a linear correction onto two planar walls.įigure 3: An example of an advanced off-axis correction.įigure 4: An example of spherical correction.

Projecting one image from one projector onto more than one surface.

Non-planar screens such a curved screens and hemispherical domes.

Advanced off-axis correction where projector placement is awkward and needs an advanced mapping over the keystone function in a projector.

For these applications, geometric correction tools such as ImmersaView Warp can be used.Īreas where geometric correction is required include: For example, advanced off-axis correction and projection on curved and other unusual surfaces. Whilst most current projectors offer this feature, in many areas, advanced functions are required. Keystone correction (trapezoidal in nature) is used when projectors have been mounted at an angle (generally pointing down from a ceiling to a screen), and the opposing angular correction needs to be applied in order for the image to be correct.

The image is warped so when it is projected onto the screen it is visually correct.įorms of image warping can be found in many projector models, with a function known as keystone correction being the most common. This process is also referred to as distortion correction or geometric correction.

Image warping (geometric correction) is used to make an image look visually correct when it is projected onto a non-planar screen.