July 1, 2021 Digital Image Processing, Lecturer
#4
1
Digital Image Processing
Digital Image Processing
Lecture #4
Lecture #4
Dr. Md. Hasanuzzaman
Professor
Department of Computer Science & Engineering
Dhaka University
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Digital Image Processing: Color, Segmentation, and Edge Detection, Cheat Sheet of Digital Image Processing
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July 1, 2021 Digital Image Processing, Lecturer 1
Digital Image Processing Digital Image Processing
Lecture #4 Lecture #
Dr. Md. Hasanuzzaman
Professor
Department of Computer Science & Engineering
Dhaka University
July 1, 2021 Digital Image Processing, Lecturer 2 Contents Contents
Color Coordinate System
Color Conversion System
Color Based Segmentation
Line and Edge Detection
July 1, 2021 Digital Image Processing, Lecturer 4 YIQ Components YIQ Components
Y=Luminance Component
I,Q=Chrominance components
Y, I, Q are different for different persons
skin colors.
July 1, 2021 Digital Image Processing, Lecturer 5
RGB to YIQ Conversion RGB to YIQ Conversion
• RGB images converted to YIQ color coordinate
systems using linear transformation matrix
Y R
I G
Q B
Example: Y=0.299R+0.587G+0.114B
July 1, 2021 Digital Image Processing, Lecturer 7 I-component I-component
July 1, 2021 Digital Image Processing, Lecturer 8 Q-component Q-component
July 1, 2021 Digital Image Processing, Lecturer 10
Results of Skin Region Results of Skin Region
Segmentation Segmentation
Without person-specific skin-color thresholds
July 1, 2021 Digital Image Processing, Lecturer 11
Results of Skin Region Results of Skin Region
Segmentation Segmentation
Using person-specific skin-color thresholds
July 1, 2021 Digital Image Processing, Lecturer 13 Example of Face Detection Example of Face Detection (1) (1)
July 1, 2021 Digital Image Processing, Lecturer 14 Example of Face Detection Example of Face Detection (2) (2)
July 1, 2021 Digital Image Processing, Lecturer 16 HSV Color Coordinates HSV Color Coordinates
cos
2 1 1
R G R B G B
R G R B
H
, ( 2 ) 255 max( , , ) , max( , , ) max( , , ) min( , , ) R G B V R G B R G B R G B S 360 ;
H H
July 1, 2021 Digital Image Processing, Lecturer 17 Example of Hand-Gesture Example of Hand-Gesture Recognition Recognition
July 1, 2021 Digital Image Processing, Lecturer 19 Example of Edge Detection Example of Edge Detection (2) (2)
July 1, 2021 Digital Image Processing, Lecturer 20 List of Reference Books List of Reference Books