For the enhancement in the spatial domain, we use the transform
function 𝒈(𝒙,𝒚) = 𝑻[𝒇(𝒙,𝒚)]
𝒇(𝒙,𝒚) --- input image, 𝒈(𝒙 ,𝒚)--- output image, 𝑻--- a transform
The object transformed may be a sub-image with 2x2, 3x3 or 1x1,
For simplicity, 1x1, so we have 𝒔 = 𝑻 𝒓
𝒓--- gray-level value for an input pixel
𝒔--- gray-level value for an output pixel
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