2.image formation (backup slide 2)

Image Formation

Image Source:http://www.sprawls.org/resources/CTIMG/module.htm#1

Department of Computer Science And Engineering

Shahjalal University of Science and Technology

Nashid AlamRegistration No: 2012321028

annanya_cse@yahoo.co.uk Masters -2 Presentation

(Backup Slides# 2)

Slide Courtesy :

Dr. Mohammed Jahirul Islam

Image Formation

Image Formation

Image Formation

Image Formation

Mammography Machine

Mammography Machine

Image Formation

Image Formation

Image Formation

Original image from MIAS database

Grayscale (Unit8 )Intensity range: 0-255

(3 channel)

Image Formation

Grayscale (Unit8 )Intensity range: 0-255

(3 channel)To

Grayscale ( Uint8)Intensity range: 0-255

(single channel)

rgb2

gray(img)

Image Formation

im2double(img)

Intensity Range: 0-1 (3 channel)

Image Formation

I2 = im2double(I1)

converts the intensity

image I1 to double

precision,

rescaling the data if

necessary.

Image Formation

Grayscale (Double)Intensity range: 0-1

(3 channel)To

Grayscale ( Double )Intensity range: 0-1

(single channel)

rgb2gray(im)

Image Formation

Image Formation

Image Formation

Along x-axis

Along Y-axis

Image Formation

Image Formation

Image Formation

Image Formation

Image Formation

Digital Image

Digital Image

Intensity range: 0-255 (3 channel)

Intensity range: 0-255 (single channel)

Digital Image

Digital Image

Digital Image

A Simple Image Formation Model

A Simple Image

Formation ModelThe Illumination- Reflectance Model

A Simple Image

Formation ModelThe Illumination- Reflectance Model

Image as 2D lightIntensity function

Reflection

Illumination

Simple Imaging Model

Simple Imaging Model

Simple Imaging Model

Simple Imaging Model

• Consists of 322 images-- Contains left and right breast images for 161 patients

• Every image is 1024 X 1024 pixels in size

• Represents each pixel with an 8-bit word(8 bit to represent each pixel)

• (0-255)=256 gray level (Monochrome image)• No. of bit required to store image, b= M*N*k

(2k= 256; k=8,M=N=1024)

MIAS Database

Mammography Image Analysis Society (MIAS) -An organization of UK research groups

Database: http://skye.icr.ac.uk/miasdb/miasdb.html

• (0-255)=256 gray level (Monochrome image)• No. of bit required to store image, b= M*N*k

(2k= 256; k=8,M=N=1024)

MIAS Database

Mammography Image Analysis Society (MIAS) -An organization of UK research groups

Database: http://skye.icr.ac.uk/miasdb/miasdb.html

•No. of bit required to store image, b= M*N*k =(1024*1024*8) bit=8,388,608 bit