Digital Image Processing 0909.452.01/0909.552.01 Fall 2001

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# Digital Image Processing 0909.452.01/0909.552.01 Fall 2001 - PowerPoint PPT Presentation

Digital Image Processing 0909.452.01/0909.552.01 Fall 2001. Lecture 13 December 10, 2001. Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall01/dip/. Plan. Course Review Final Project Presentations Lab. DIP: Details.

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### Digital Image Processing0909.452.01/0909.552.01Fall 2001

Lecture 13December 10, 2001

Shreekanth Mandayam

ECE Department

Rowan University

http://engineering.rowan.edu/~shreek/fall01/dip/

Plan
• Course Review
• Final Project Presentations
• Lab

1 2 3 4 5

1

2

3

4

5

Recall: DCT Features

Fringe Pattern

DCT Coefficients

DCT

(1,1)

(1,2)

(2,1)

(2,2)

.

.

.

Artificial

Neural

Network

Feature

Vector

-1

-1

-2

0

-1

1

f(x,y)

fe(x,y)

0

0

0

2

0

-2

2

0

1

1

-1

1

Image Segmentation Recall: Edge Detection

Equal time intervals

Recall: 1-D DFT
• Discrete Domains
• Discrete Time: k = 0, 1, 2, 3, …………, N-1
• Discrete Frequency: n = 0, 1, 2, 3, …………, N-1
• Discrete Fourier Transform
• Inverse DFT

Equal frequency intervals

n = 0, 1, 2,….., N-1

k = 0, 1, 2,….., N-1

Image Moments

2-D continuous function f(x,y), the moment of order (p+q) is:

Central moment of order (p+q) is:

Image Moments (contd.)

Normalized central moment of order (p+q) is:

A set of seven invariant moments can be derived from gpq

Image Textures

The USC-SIPI Image Database

http://sipi.usc.edu/

Morphological Operations

Erosion

X Q B

X

B

origin

Dilation

X

B

origin

Opening

X

B

origin

Closing

X

origin

B

Morphological Operations
Morphological Operations: Matlab

BWMORPH Perform morphological operations on binary image.

BW2 = BWMORPH(BW1,OPERATION) applies a specific morphological operation to the binary image BW1.

BW2 = BWMORPH(BW1,OPERATION,N) applies the operation N times. N can be Inf, in which case the operation is repeated until the image no longer changes.

OPERATION is a string that can have one of these values:

'close' Perform binary closure (dilation followed by erosion)

'dilate' Perform dilation using the structuring elementones(3)

'erode' Perform erosion using the structuring elementones(3)

'fill' Fill isolated interior pixels (0's surrounded by1's)

'open' Perform binary opening (erosion followed bydilation)

'skel' With N = Inf, remove pixels on the boundariesof objects without allowing objects to break apart

• demos/demo9morph/
Lab 4: Digital Image Compression

http://engineering.rowan.edu/~shreek/fall01/dip/lab4.html