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Keystone correction is a feature included with many projectors that provides the ability to intentionally "distort" the output image to recreate the original rectangular image provided by the video or computer source, thus eliminating the skewed output that would otherwise result due to angled projection.
This is the standard blend mode which uses the top layer alone, [3] without mixing its colors with the layer beneath it: [example needed] (,) =where a is the value of a color channel in the underlying layer, and b is that of the corresponding channel of the upper layer.
If the images to be rectified are taken from camera pairs without geometric distortion, this calculation can easily be made with a linear transformation.X & Y rotation puts the images on the same plane, scaling makes the image frames be the same size and Z rotation & skew adjustments make the image pixel rows directly line up [citation needed].
The mood effect of perspective distortion achieved by rectilinear extreme wide-angle lenses is that the resulting image looks grotesque and unsettling, while not looking as unrealistic as curvilinear fisheye lenses which display barrel distortion. The effect is especially noticeable the closer the camera is to the subject, as its amount ...
A free image may be either public domain, or released under a free license, such as CC-BY-SA. Free images can be used in any article where their presence would add value. As long as there is a consensus among the editors working on an article that the image is appropriate for the article, it's safe to say that it can remain in an article. Free ...
to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
Image manipulation software has affected the level of trust many viewers once had in the aphorism "the camera never lies". [40] Images may be manipulated for fun, aesthetic reasons, or to improve the appearance of a subject [41] but not all image manipulation is innocuous, as evidenced by the Kerry Fonda 2004 election photo controversy.
In number theory, Skewes's number is the smallest natural number for which the prime-counting function exceeds the logarithmic integral function (). It is named for the South African mathematician Stanley Skewes who first computed an upper bound on its value.