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

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Image warping (geometric correction) is used to make an image look visually correct when it is projected onto a non-planar screen. This process is also referred to as distortion correction or geometric correction. The image is warped so when it is projected onto the screen it is visually correct.

Forms of image warping can be found in many projector models, with a function known as keystone correction being the most common. 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. Whilst most current projectors offer this feature, in many areas, advanced functions are required. For example, advanced off-axis correction and projection on curved and other unusual surfaces. For these applications, geometric correction tools such as ImmersaView Warp can be used.

Projection onto a flat screen, left / right oblique projection, p torojection a vertical curve screen, or projection to a horizontal curve screen. When you select diagonal projection, the angle setting text box will be displayed. When you select projection onto a curved screen, the following two types of text boxes are displayed. The exact layout of the projectors will change depending upon screen size, screen shape and the optics of specific projectors used. Here for illustrative purposes, we show an example of projector placement on a curved screen with the overlapping regions described above. Once the projectors are aligned, overlapped and ready to go, the software. Need help calculating the right size projector screen for your needs? Look no further! Use our Screen Size Calculator to determine the viewable area of a screen based on any 1 dimension.; Use our Projector Calculator to determine throw distance and optimal screen sized based on your projector.; Use our Viewing Distance Calculator to figure out the optimal seating distance for your audience.

Areas where geometric correction is required include:

Advanced off-axis correction where projector placement is awkward and needs an advanced mapping over the keystone function in a projector
Non-planar screens such a curved screens and hemispherical domes
Projecting one image from one projector onto more than one surface
Unusual projection applications onto custom designed screens

Figure 1: An example of a cylindrical correction.

Our award winning mobile projection screens can be curved to virtually any radius. The light weight design derives from our mobile projection screen products which are in use at the world’s leading rental and staging companies. Curve features the same slim design and easy setup with our unequaled quality. Change your way of projecting. Pixelwix Projector Calculator is a must-have tool for designing single of multi-projector displays on all screen and room shapes. You will get a complete 3D simulation of how the finished image will look and will now even connect to your playback content using SPOUT or the provided player to send your content live through the virtual projectors (even when using warp and blend!).

Figure 2: An example of a linear correction onto two planar walls.
Figure 3: An example of an advanced off-axis correction.

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Figure 4: An example of spherical correction.

To describe the process of geometric correction in greater detail, we have taken the example of projecting onto a curved surface. For cylindrical and spherical screens, variations of barrel and pincushion correction functions are required to correct the image. The exact mapping will be dependent upon the optical characteristics of the projector, the screen’s size and shape as well as whether the imagery is front or rear projected.

Geometric correction can be performed with some special high-end projectors with advanced modules, but they are not common and tend to be expensive. There are also external electronic devices which can compensate for any geometric correction, but these also tend to be expensive.

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Big fish games universal crack keygen. Recently with advances in computer graphics cards, software solutions can now offer the ability to perform geometric correction. One such tool is ImmersaView Warp. This method provides a user with a number of control points which can be increased/decreased depending upon the complexity of the screen shape (see Figure 5). These control points can be manipulated by the user so an image is aligned correctly to a screen.

Figure 5: Control points for included for image warping.

Typically, when a standard projector is used on a curved (cylindrical) screen, the image gets a characteristic “smile” shape (see Figure 6). To overcome this we need to use the control points along the top and bottom of the image to pull the image back down into shape. Because the pixels in the middle of the image will be bigger than the pixels at the edges, we compensate for this by dragging the control points near the center of the screen closer together. This tells the software system that these parts of the screen are further away and it automatically adjusts. ImmersaView Warp displays a checkerboard, which helps to create the right image warping pattern. When all the checks in the checkerboard look the same size, the distortion correction is correct.

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Figure 6: Characteristic smile distortion when projecting onto a cylindrical screen.

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There are also other screen shapes that can be produced from complex curved and flat sections. One example of a linear based display is a wedge, composed from two flat screens. Here a single projector can be used with two advanced keystone correction patterns to project onto a single screen. Figure 7 shows an example of the pattern needed to rear project onto a convex wedge screen. To create these shapes the distortion systems need to be told that they are dealing with flat sections and rather than curved screens.

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Figure 7: Projection map onto a two linear screens from one projector.
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