COLOR CONTRAST ENHANCEMENT

ccenhance_cvip() - This function improves the color of the image.

Contents

SYNTAX

outputImage = ccenhance_cvip(InputImage, lowLimit, highLimit, lowClip, highClip);

Input Parameters include :

Output Parameters include :

DESCRIPTION

Color Contrast Enhance is an algorithm used to create brighter and better images. This function takes a color image as input. First, the function transforms the image to HSL color space and extracts the Hue, Saturation and Lightness bands. Then, it performs the histogram equalization on saturation band, which improves and intensifies the color richness. The lightness band is histogram stretched to improve the contrast. The HSL bands are then combined and inverse HSL transform is appplied. This function increases contrast in an image by stretching the histogram to span the range low_limit to high_limit.To improve performance of the function when outliers are present, percentage lowClip and highClip pixel values can be removed before the stretch takes place.

REFERENCE

1. Scott E Umbaugh. DIGITAL IMAGE PROCESSING AND ANALYSIS: Applications with MATLAB and CVIPtools, 3rd Edition.

EXAMPLE

% Read Image

  ipImage1=imread('butterfly.tif');

% Call function

  cceImage = ccenhance_cvip(ipImage1,0,255,0.025,0.025);

% Display Input Image

  figure;imshow(ipImage1);title('Original RGB Image');

% Display Output Image

  figure;imshow(cceImage);title('Color Contrast Enhanced Image');

CREDITS

Author: Deependra Mishra, July 2017
Copyright © 2017-2018 Scott E Umbaugh
For updates visit CVIP Toolbox Website

Published with MATLAB® R2016a