This lecture overviews Image Perception. This is very important to understand image quality issues and develop many appropriate image processing operations. It covers the following topics in detail: Human Vision Modelling, Weber ratio, Mach Phenomenon. Mathematical neuron model. HVS has band-pass frequency characteristics, Laplacian-of-Gaussian retina modelling. V1 visual cortex and Gabor functions. Spatial HVS models, Angular Spatial Frequency, Kelly experiments, Saccadic eye motion, HVS Contrast sensitivity. Gestalt theory. Visual illusions.