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Moiré patterns are often an artifact of images produced by various digital imaging and computer graphics techniques, for example when scanning a halftone picture or ray tracing a checkered plane (the latter being a special case of aliasing, due to undersampling a fine regular pattern). [3]
An MRI artifact is a visual artifact (an anomaly seen during visual representation) in magnetic resonance imaging (MRI). It is a feature appearing in an image that is not present in the original object. [1] Many different artifacts can occur during MRI, some affecting the diagnostic quality, while others may be confused with pathology.
It also often refers to the distortion or artifact that results when a signal reconstructed from samples is different from the original continuous signal. Aliasing can occur in signals sampled in time, for instance in digital audio or the stroboscopic effect , and is referred to as temporal aliasing .
The first digital camera to use a Foveon X3 sensor was the Sigma SD9, a digital SLR launched in 2002. [5] It used a 20.7 × 13.8 mm, 2268 x 1512 × 3 (3.54 × 3 MP) iteration of the sensor and was built on a Sigma-designed body using the Sigma SA mount.
In microscopy, an artifact is an apparent structural detail that is caused by the processing of the specimen and is thus not a legitimate feature of the specimen. In light microscopy, artifacts may be produced by air bubbles trapped under the slide's cover slip. [1] In electron microscopy, distortions may be produced in the drying out of the ...
The blur makes the image less sharp, but prevents the formation of moiré pattern aliasing artifacts. Gaussian blurring is commonly used when reducing the size of an image. When downsampling an image, it is common to apply a low-pass filter to the image prior to resampling.
The Approval was designed to mimic the quality of Printing presses using high resolution imaging (2,400 or 2,540 DPI similar to the printing plate) and halftone screening to accurately reflect what would be seen on press. Stochastic screening (or FM screening) can also be used to proof print runs with this screening technique.
Shape moiré is one type of moiré patterns demonstrating the phenomenon of moiré magnification. [1] [2] 1D shape moiré is the particular simplified case of 2D shape moiré.
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