Ri Digital Image

Front 1

Image summarising conversion from digital to analog image.

Back 1

summary

Front 2

Digital image processing simply means, operate
upon _______ using computer

Back 2

pictorial information

Front 3

What constitute a digital image?

Back 3

An image that has been discretized into coordinates and brightness from a continuous image.

Front 4

a digital image is represented by ________

Back 4

Represented by 2D integer array or a series of 2D
arrays for each colour band.

Front 5

Monochromatic image has no colour but only ______.

Back 5

shades of
grey.

Front 6

Colour image is represented by ________ or indexed.

Back 6

red, green and blue
components

Front 7

Often the brightness values of a digital image range from _______

Back 7

0 (black)
to 255 (white).

Front 8

waht are the 3 Types of Digital Image?

Back 8

Binary image, Grayscale, True Colour

Front 9

what is a binary image?

Back 9

Each pixel are either just black or white

Front 10

what is Grayscale image?

Back 10

Each pixel is a shade of grey, from 0 to 255

Front 11

What is a True Colour image?

Back 11

Each pixel has a particular colour

Front 12

Binary Image

Back 12

Needs only 1 bit
 a binary digit - 0 or 1
 1 bit digital representation - black and white

Front 13

Grayscale [each pixel is 1 byte(8 bits)]. for what type of images u use it for?

Back 13

Used in X-rays, MRI, CT

Front 14

i pixel for true colour image have ___ bits

Back 14

24
8 bits for each of the 3 colour band (red, green blue).
Thus, each pixels is 24 bits.

Front 15

true colour images can give how many colours?

Back 15

 Each component is 0 to 255; gives 2553 or 16,777,216
different colours.

Front 16

true colour component not used in ______ (modalities) as the devices are unable to detect colours.

Back 16

X-Ray, MRI or CT

Front 17

what does lightness refer to?

Back 17

 Refers to the Intensity value
 i.e. Brightness of the colour

Front 18

what does hue refer to?

Back 18

Refers to the colour
 i.e. Green, Blue, Orange, etc

Front 19

what does saturation refer to?

Back 19

Saturation
 Refers to the measure of how white is in the colour.
 i.e. pink is more white, so it is less saturated than pure red

Front 20

Eg of analog image, digital sampling, pixel quantisation

Back 20

eg

Front 21

What is the ADC (Analogue-to-Digital) converter for?

Back 21

Vital in converting an analogue signal into digital
data for input into a computer for processing
Consists of several components that divide the
analogue signal into equal parts

Front 22

Spatial Frequency Domain

Back 22

The rate at which brightness cycle is the spatial frequency.
 The higher the cycle rate, the higher the spatial frequency

Front 23

How does the number of bits per pixel impact the image ?

Back 23

Number of bits per pixel determines how many colours or
shades of gray to be displayed

Front 24

How does the Matrix Size affect the image quality?

Back 24

As matrix size increase for the same FOV, picture
quality improves; that is the images become
sharper

Front 25

Spatial density?

Back 25

 is a measure of the number of pixels in a digital image

Front 26

Optical resolution

Back 26

 is a measure of the capability of how well the entire
physical imaging system can resolve the spatial details of
an original scene
 relates to the quality of imaging system’s optics, photosensor and electronics