image editing image restoration independent component analysis linear filtering neural networks partial differential equations pixelation point feature matching principal components analysis self organizing maps wavelets digital image transformations filtering digital filters used blur sharpen digital images filtering performed convolution specifically designed kernels filter array spatial domain ref name ref masking specific frequency regions frequency fourier domain following examples show methods ref name gonzalez ref class wikitable filter type kernel mask example '''original image''' align center math begin bmatrix
Formal science Computer science Computer graphics Image processing