Nguyễn Công Phương
DIGITAL IMAGE PROCESSING
Image Acquisition, Types, and File I/O
Contents
Introduction to Image Processing & Matlab Image Acquisition, Types, & File I/O Image Arithmetic
Image Transform Spatial & Frequency Domain Filter Design Image Restoration & Blind Deconvolution
Binary Image Processing Image Encryption & Watermarking Image Classification & Segmentation
I. II. III. IV. Affine & Logical Operations, Distortions, & Noise in Images V. VI. VII. VIII. Image Compression IX. Edge Detection X. XI. XII. XIII. Image – Based Object Tracking XIV. Face Recognition XV. Soft Computing in Image Processing
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Image Acquisition, Types, and File I/O
1. Image Acquisition 2. Image Types & File I/O 3. Basics of Color Images
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Image Acquisition
• Real – world 3D objects are converted into
digital images: – Cameras – Ultrasounds – X-rays & radiography – Magnetic resonance imaging (MRI) – Satellite imagers
• Scanners.
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Image Types & File I/O
• Image types:
– Bitmap (.bmp) – Joint Photographic Experts Group (.jpg) – Graphics Interchange Format (.gif) – Tagged Image File Format (.tif) – … • File I/O:
– Read: imread – Show: imshow – Write: imwrite
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Basic of Color Images (1)
http://drmoron.org/is‐black‐a‐color/
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Basic of Color Images (2)
76 50
68 49
106 110 91 73
98
71
116 111
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Basic of Color Images (3)
https://andrewharvey4.wordpress.com/2009/08/22/comp3421‐lec‐1‐colour/
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Basic of Color Images (4)
YIQ Color Space
Y R 0.299 0.587 0.144
0.596 0.275 0.321 I G
R G
0.9736 0.9675
0.9873 0.2385
0.5682 0.6941
Y I
B
0.9789
1.0779
1.6497
Q
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0.212 0.528 0.311 Q B
