Digital Image Processing, Spring 2006 1 ECES 682 Digital Image Processing Week 7 Oleh Tretiak ECE Department Drexel University.

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Presentation transcript:

Digital Image Processing, Spring ECES 682 Digital Image Processing Week 7 Oleh Tretiak ECE Department Drexel University

Digital Image Processing, Spring Announcements Midterm has been graded  Grades posted on webct  Average Select your project! Project due on May 15 Final exam on Monday, June 12

Digital Image Processing, Spring Image Distortion Model Restoration depends on distortion  Common model: convolve plus noise  Special case: noise alone (no convolution)

Digital Image Processing, Spring Thoughts on Restoration Enhancement vs restoration  Enhancement: cosmetic  Restoration: substantive  In reality, there’s a continuum Restoration relies on prior knowledge Example of restoration  Inverse filtering  Noise removal  Nonlinear processing

Digital Image Processing, Spring Chapter 6, Color Image Processing Color fundamentals and models Pseudocolor  Slicing  False-color maps  Index color  Multispectral color models Color transformations Smoothing and sharpening Color segmentation

Digital Image Processing, Spring Retinal Physiology and Color Human retinas have (at least) four types of photoreceptors  Three types of ‘cones’  High light level, high acuity vision  Each type of cone has a different spectral response  One type of ‘rods’  Low-light level and peripheral vision There is substantive genetic diversity in color receptors  Different spectral response of photoreceptor  Absence of one of the pigments  Many more phenomena...

Digital Image Processing, Spring Spectral Response of Cones

Digital Image Processing, Spring Color Matching Theory Young’s observation  Any uniform color can be matched by projecting three different light sources onto a screen In the 1920’s, an international effort on the part of a number of physicists let to the CIE standard color theory The effort attempted to simplify and standardize There have been many refinements, but the basic theory still stands Theory useful for matching pigments (all paint stores have spectrophotometers) and design of color media systems

Digital Image Processing, Spring Tristimulus Values

Digital Image Processing, Spring Chromaticity Diagram From White is (1/3, 1/3, 1/3) Y is the subjective intensity.

Digital Image Processing, Spring Standard Observer

Digital Image Processing, Spring Better Subjective Color Constant distances in x, y space do not correspond to ‘constant’ changes of color A better linear space is provided by the Y-U-V coordinates

Digital Image Processing, Spring RGB Coordinates With the advent of color television, the RGB coordinates were introduced to conveniently produce color on a color cinescope (cathode ray tube)

Digital Image Processing, Spring RGB Gamut Color space produced by a specific set of phosphors or LCD filters is limited

Digital Image Processing, Spring Constant-Color-Difference Coordinates For modulation (analog TV) and encoding (digital TV, JPEG), Y-U-V-like coordinates are produced R’, G’, B’ are gamma corrected RGB. These are used in electronic media.

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing

Digital Image Processing, Spring Chapter 6 Color Image Processing Chapter 6 Color Image Processing