1

Computer Vision &

Image Processing

G. Andy Chang

Department of Mathematics & Statistics

Youngstown State University

Youngstown, Ohio

CV & IP 2

Human Vision

Illusion

1. Green > Red2. Green = Red3. Green < Red

CV & IP 3

Illusion (Human Vision)

CV & IP 4

Vision System

Human Vision Qualitative Comparative

Computer Vision Quantitative

•320 pixels

•334 pixels

Pixel (combination of Picture & Element) is the smallest element of a display which can be assigned a color.

CV & IP 5

Old design

Wafer

•Human hair thickness is about 100 micron.

CV & IP 6

Computer Vision 564×380 Digital Image

CV & IP 7

28=2560 ~ 255

CV & IP 8

Original Image (564×380)8-bit Gray Scale Image (256 gray

levels)

CV & IP 9

Image with 84 × 57 pixels(Low resolution)

CV & IP 10

1 1 1 1 1 1 1 1 1 1 1 2 2 3 3 41 1 1 1 1 1 1 1 1 1 2 3 3 4 4 51 1 1 1 1 1 1 1 1 2 3 3 4 5 6 71 1 1 1 1 1 1 1 1 1 2 2 3 4 5 61 1 1 1 1 1 1 1 1 1 1 2 2 3 4 51 1 1 1 1 1 1 1 1 1 1 1 1 2 3 41 1 1 1 1 1 1 1 1 1 1 1 1 1 2 21 1 1 2 2 1 1 1 1 1 1 1 1 1 1 21 1 2 3 3 2 1 1 1 1 1 1 1 1 1 11 2 3 4 4 3 2 1 1 1 1 1 1 1 1 11 2 3 4 4 3 2 1 1 1 1 1 1 1 1 11 2 3 4 5 4 3 2 1 1 1 1 1 1 1 11 2 3 4 5 5 4 3 2 1 1 1 1 1 1 11 2 3 4 5 6 5 4 3 2 2 1 1 1 1 11 2 3 3 4 5 6 5 4 3 2 2 1 1 1 12 3 3 4 4 4 5 5 5 4 3 2 2 1 1 1

True Image Gray Level Bar Chart

0

1

-2

8

1 4 7

10 13 16

0

2

4

6

8

3-bit Gray Scale Image (0 – 7)

EXCEL WORKSHEET_AM

EXCEL WORKSHEET_PM

CV & IP 11

Original Image (564×380)8-bit Gray Scale Image (256 = 28 gray

levels)

CV & IP 12

Smoothed Image

CV & IP 13

Sharpened Image

CV & IP 14

Inverted Image (564×380)8-bit Gray Scale Image

0 255

1 254

2 253

3 252

4 251

5 250

…

CV & IP 15

Object Identification

(Binary Thresholding)

CV & IP 16

Object Identification

CV & IP 17

Object Identification

CV & IP 18

Object Identification

CV & IP 19

CV & IP 20

CV & IP 21

CV & IP 22

CV & IP 23

CV & IP 24

 

 

CV & IP 25

Histogram of Gray Level (Simple Setting)

0

50000

100000

150000

0 50 100 150 200 250

Gray Scale

Fre

qu

ency

Old design

CV & IP 26

Histogram of Gray Level (coallight)

0

2000

4000

6000

8000

0 50 100 150 200 250

Gray Scale

Fre

qu

ency

Old design

CV & IP 27

Oyster Size Measurement

(a) (b)

a) Original Image

b) Binary Image of Projected Area

CV & IP 28

Images of Firm and Soft Apples

CV & IP 29

Blood Cells