Video Lecturers on Digital Image Processing Gholamreza Anbarjafari
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Digital Image Processing Spatial Aliasing and Image Enhancement
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Aliasing Critical Sampling Distance: is corresponding to the Nyquist Rate. the Sampling Distance
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Aliasing of a undersampled 1 D sinusoidal signal Aliasing of a undersampled 2 D image © 2002 R. C. Gonzalez & R. E. Woods
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Anti-Aliasing problem of a downsampled image © 2002 R. C. Gonzalez & R. E. Woods Aliasing problem avoided by using band limiting Low Pass Filter.
Video Lecturers on Digital Image Processing Moiré Pattern © 2002 R. C. Gonzalez & R. E. Woods Gholamreza Anbarjafari, Ph. D
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Image Enhancement Frequency Domain Methods: manipulates the Fourier transform of a given image for enhancement.
Video Lecturers on Digital Image Processing g(x, y)=T[f(x, y)] f(x, y) : input g(x, y) : output T : transformation function Gholamreza Anbarjafari, Ph. D
Video Lecturers on Digital Image Processing (x, y) 3 x 3 neighborhood (mask) Gholamreza Anbarjafari, Ph. D
Video Lecturers on Digital Image Processing Gholamreza Anbarjafari, Ph. D Image Enhancement in Spatial Domain Mask Processing/Filtering: where the values of the mask coefficients determine the nature of the process.
Video Lecturers on Digital Image Processing Contrast Stretching Gholamreza Anbarjafari, Ph. D
Video Lecturers on Digital Image Processing Summary § We have looked at: § What is aliasing? § What is anti-aliasing? § What is image enhancement? § Image enhancement in spatial domain § Next time we will talk about contrast stretching Gholamreza Anbarjafari, Ph. D
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