color models in digital image processing pdf

Nowadays color image processing widely utilized in multimedia, graphics and computer vision applications. Pixel depth: # of bits used to represent each pixel in RGB space. Digital Image Processing Chapter 6: Color Image Processing ... combinations of red green and blue light This is an additive color model 6 combinations of red, green and blue light. Typical color images are represented as red, green, and blue (RGB images). Digital Image Processing (CS/ECE 545) Lecture 9: Color Images (Part 2) & Introduction to Spectral Techniques (Fourier Transform, DFT, DCT) Prof Emmanuel Agu Computer Science Dept. This is an color model. Wood, Digital Image Processing, 2nd Edition. Color reproducibility • Only a subset of the 3D CIE XYZ space called 3D color gamut • Projection of the 3D color gamut on the same plane with normal (1,1,1) –Triangle –2D color gamut •Cannot describe brightness range reproducibility CMY Color model Passive displays, such as color inkjet printers, absorb light instead of Color Image Processing 4 Color models Also called color space or color system Allow the specification of colors in some standard way Specification of a coordinate system and a subspace within that system – Each color represented by a single point Models oriented towards hardware (rendering and scanning) or software (reasoning and applications) The use of color image processing is divided by two factors. Each image consists of 3 component images, one for each primary color. Color spaces provide a rational method to specify order, manipulate and effectively display the object colors taken into consideration. Wood, Digital Image Processing, 2nd Edition. Digital storage for image processing applications falls into three principal categories: 1. Continue Digital image processing gonzalez For courses in image processing and computer vision. information stored in the digital image data is the gray-level information in each spectral band. The total number of colors in this 24-bit RGB image is 2 This introduction to basic concepts and methods for fully self-contained -- and heavily illustrated -- digital image processing is written at a level that is actually suitable for seniors and first-year undergraduate students in almost any technical discipline. There are various models based on human perception, on color recognition, on various color components etc. Digital Image Processing Color Models &Processing Dr. Hatem Elaydi Electrical Engineering Department Islamic University of Gaza Fall 2015 Nov 16, 2015 Using the 8-bit monochrome standard as a model, the corresponding color image would have 24-bits/pixel (8-bits for each of the three color bands red, green, and blue). And image of sized 1024 * 1024 pixels requires one megabyte of storage space if the image is not compressed. HSI Color Model RGB, CMY models are not good for human interpreting HSI Color model: Hue: Dominant color Saturation: Relative purity (inversely proportional to amount of white light added) Intensity: Brightness Color carrying information Components of an Image Processing System 5. Purpose of color models: to facilitate the specification of colors in some standard RGB color models: - based on Cartesian coordinate system GB Color Spaces (Images from Rafael C. Gonzalez and Richard E. Wood, Digital Image Processing, 2nd Edition. Worcester Polytechnic Institute (WPI) RGB Color Cube R = 8 bits G = 8 bits B = 8 bits Mass Storage Capability Mass storage capability is a must in a image processing applications.

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