Ji-Hee Han, Sejung Yang, and Byung-Uk Lee, Member, IEEE IEEE
TRANSACTIONS ON IMAGE PROCESSING, VOL. 20, NO. 2, FEBRUARY
2011
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INTRODUCTION REVIEW OF PREVIOUS WORK BASED UPON THE 3-D COLOR
HISTOGRAM PROPOSED METHOD: A CDF WITH AN ISO-LUMINANCE-PLANE
BOUNDARY EXPERIMENTS
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INTRODUCTION REVIEW OF PREVIOUS WORK BASED UPON THE 3-D COLOR
HISTOGRAM PROPOSED METHOD: A CDF WITH AN ISO-LUMINANCE-PLANE
BOUNDARY EXPERIMENTS
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histogram equalization has become embedded in most consumer
digital cameras The majority of color histogram equalization
methods do not yield uniform histogram in gray scale This paper
proposes a novel 3-D color histogram equalization method that
produces uniform distribution in gray scale histogram
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INTRODUCTION REVIEW OF PREVIOUS WORK BASED UPON THE 3-D COLOR
HISTOGRAM PROPOSED METHOD: A CDF WITH AN ISO-LUMINANCE-PLANE
BOUNDARY EXPERIMENTS
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A. Gray Scale Histogram Equalization The pdfs of them are
denoted as, and the corresponding cdfs are,and intensity of the
original input image as modified intensity of the resulting output
image as L is the number of intensity levels
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B. Previous Methods Based upon 3-D Color Histogram Equalization
Trahanias and Venetsanopoulos [2] defined the cdf in RGB color
space as
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The desired output cdf is given as:
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R, G, and B components are the same, i.e., The resulting cdf
for this image is proportional to, i.e.,
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Menotti proposed to adopt an input cdf that multiplies each
marginal cdf of three channels, i.e.,
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C. Generalization of Gray Scale Image Enhancement to Color
Images Naik and Murthy [21] proposed a scheme to generalize any
gray scale image processing to color images
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INTRODUCTION REVIEW OF PREVIOUS WORK BASED UPON THE 3-D COLOR
HISTOGRAM PROPOSED METHOD: A CDF WITH AN ISO-LUMINANCE-PLANE
BOUNDARY EXPERIMENTS
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Where is the input intensity Since the ideal output pdf is
uniform over all values of n, the output cdf is Since, we
obtain
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INTRODUCTION REVIEW OF PREVIOUS WORK BASED UPON THE 3-D COLOR
HISTOGRAM PROPOSED METHOD: A CDF WITH AN ISO-LUMINANCE-PLANE
BOUNDARY EXPERIMENTS
