Overview, Computer imaging systems ,Human visual system, image model, Image enhancement, gray scale modes, histogram mod ,Discrete transforms, Fourier discrete cosine, walsh-hadamard, Haar, PCT, filtering, wavelet transform, pseudocolor, Image enhancement, sharpening ,smoothing Image restoration, overview, system model, noise, : noise removal, degradation model, inverse filter, Freq. filters, geometric transforms, image compression: system model, lossless methods, lossy methods.