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More specific types of resampling include: upsampling or upscaling; downsampling, downscaling, or decimation; and interpolation. The term multi-rate digital signal processing is sometimes used to refer to systems that incorporate sample-rate conversion.
A mipmap is a prescaled set of downscaled copies. When downscaling, the nearest larger mipmap is used as the origin to ensure no scaling below the useful threshold of bilinear scaling. This algorithm is fast and easy to optimize. It is standard in many frameworks, such as OpenGL. The cost is using more image memory, exactly one-third more in ...
Let L/M denote the upsampling factor, where L > M. Upsample by a factor of L; Downsample by a factor of M; Upsampling requires a lowpass filter after increasing the data rate, and downsampling requires a lowpass filter before decimation. Therefore, both operations can be accomplished by a single filter with the lower of the two cutoff frequencies.
Blur kernel, downscaling operation and additive noise should be estimated for given input to achieve better results. Video super-resolution approaches tend to have more components than the image counterparts as they need to exploit the additional temporal dimension.
Often, applications call for bicubic interpolation using data on a rectilinear grid, rather than the unit square. In this case, the identities for ,, and become (,) = = =, (,) = = =, (,) = = =, where is the spacing of the cell containing the point (,) and similar for .
Luigi Mangione — the man charged with murdering UnitedHealthcare CEO Brian Thompson — had reportedly been dealing with "debilitating" back pain before going "radio silent" with friends over ...
No app can fix your focus. Here’s how CNN’s Upasna Gautam ditched the productivity hacks and embraced the basics to get the most out of life.
Here, digital interpolation is used to add additional samples between recorded samples, thereby converting the data to a higher sample rate, a form of upsampling. When the resulting higher-rate samples are converted to analog, a less complex and less expensive analog reconstruction filter is required. Essentially, this is a way to shift some of ...