introduction to image processing representasi citra tahap-tahap kunci pada image processing aplikasi...
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Images are Ubiquitous Input Optical photoreceptors Digital camera CCD array Output TVs Computer monitors PrintersTRANSCRIPT
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Introduction toImage Processing
• Representasi Citra• Tahap-Tahap Kunci pada Image Processing• Aplikasi dan Topik Penelitian pada Image Processing
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Image Representation
Representasi Citra
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Images are Ubiquitous
Input Optical photoreceptors Digital camera CCD array
Output TVs Computer monitors Printers
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Image Formation
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Sampling and Quantization
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Sampling and Quantization
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Image as Array of Pixels
An image is a 2-d rectilinear array of pixels
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Pixels as samples
A pixel is a sample of a continuous function
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What is an image?The bitmap representation
Also called “raster or pixel maps” representationAn image is broken up into a grid
pixel
Gray level
Original picture Digital imagef(x, y) I[i, j] or I[x, y]
x
y
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What is an image?The bitmap representation
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What is an image?The vector representation
Object-oriented representationDoes not show information of individual pixel, but information of an object (circle, line, square, etc.)
Circle(100, 20, 20)Line(xa1, ya1, xa2, ya2)Line(xb1, yb1, xb2, yb2)Line(xc1, yc1, xc2, yc2)Line(xd1, yd1, xd2, yd2)
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Comparison between Bitmap Representation and Vector Representation
Bitmap Can represent images with
complex variations in colors, shades, shapes.
Larger image size Fixed resolution Easier to implement
Vector Can only represent simple
line drawings (CAD), shapes, shadings, etc.
Efficient Flexible Difficult to implement
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Image as a Function
We can think of an image as a function, f, from R2 to R: f( x, y ) gives the intensity at position ( x, y ) Realistically, we expect the image only to be defined over a
rectangle, with a finite range: f: [a,b]x[c,d] [0,1]
A color image is just three functions pasted together. We can write this as a “vector-valued” function:
( , )( , ) ( , )
( , )
r x yf x y g x y
b x y
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Image as a function
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Properties of Images
Spatial resolution Width pixels/width cm and height pixels/ height cm
Intensity resolution Intensity bits/intensity range (per channel)
Number of channels RGB is 3 channels, grayscale is one channel
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Common image file formats
GIF (Graphic Interchange Format) - PNG (Portable Network Graphics)JPEG (Joint Photographic Experts Group)TIFF (Tagged Image File Format)PGM (Portable Gray Map)FITS (Flexible Image Transport System)
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Key Stages in Digital Image Processing
Tahap-tahap Kunci pada Pemrosesan Citra Digital
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Key Stages in Digital Image Processing
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Image Aquisition
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Image Enhancement
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Image Restoration
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Morphological Processing
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Segmentation
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Object Recognition
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Representation & Description
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
Imag
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Key Stages in Digital Image Processing:Image Compression
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
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Key Stages in Digital Image Processing:Colour Image Processing
Image Acquisition
Image Restoration
Morphological Processing
Segmentation
Representation & Description
Image Enhancement
Object Recognition
Problem Domain
Colour Image Processing
Image Compression
Imag
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Applications and Research Topics
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Document Handling
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Signature Verification
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Biometrics
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Fingerprint Verification / Identification
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Fingerprint Identification Research at UNR
Minutiae Matching
Delaunay Triangulation
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Object Recognition
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Object Recognition Research reference view 1 reference view 2
novel view recognized
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Indexing into Databases
Shape content
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Indexing into Databases (cont’d)Color, texture
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Target Recognition
Department of Defense (Army, Airforce, Navy)
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Interpretation of aerial photography is a problem domain in both computer vision and registration.
Interpretation of Aerial Photography
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Autonomous Vehicles
Land, Underwater, Space
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Traffic Monitoring
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Face Detection
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Face Recognition
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Face Detection/Recognition Research at UNR
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Facial Expression Recognition
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Face Tracking
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Face Tracking (cont’d)
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Hand Gesture RecognitionSmart Human-Computer User InterfacesSign Language Recognition
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Human Activity Recognition
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Medical Applications
skin cancer breast cancer
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Morphing
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Inserting Artificial Objects into a Scene