applyfilt
applyfilt is a term used in image and signal processing to describe a function that applies a filter to an input data set. In practice it typically performs a convolution or correlation with a user-supplied kernel, producing a filtered output. The function is generic and appears in many libraries as part of filtering workflows.
Inputs usually include the data array (which can be 1D signals, 2D images, or 3D volumes) and
Implementation options include direct spatial convolution, FFT-based methods for large kernels, or separable filters that decompose
Applications include smoothing, sharpening, blur, edge detection, and noise reduction. It is a common building block