3-2

Question 1

what is an image histogram

Answer 1

shows frequency of pixels/intensity values

Question 2

applications of image histogram (4)

Answer 2

• improve visual appearance of image using various methods

Analysis of image quality:
- depict image statistics in graphical format
- May highlight problems originated during image acquisition eg. Exposure, contrast
- Detect wide range of defects ie. saturation, impact of compression

Question 3

image brightness vs image contrast in image histogram

Answer 3

Image Brightness: intensity
of light emitted by particular light source

Image Contrast: difference
between maximum and minimum
pixel intensity in an image

Question 4

histogram sliding and purpose

Answer 4

shifts the whole histogram rightwards/ leftwards of the graph

purpose: improve image brightness

Question 5

g = (f- fmin/ fmax- fmin) (max)

Answer 5

g = output image
f = input image
fmax = current image max intensity/ pixel val
fmin = current image min intensity/ pixel val
max = max intensity/ pixel val possible

Question 6

histogram stretching effect, disadvantage and purpose

Answer 6

Effect :
takes image and stretches histogram across the entire gray-level range,
increasing contrast of a low contrast image

Disadvantage:
If fmax & fmin is alr 0 and 255 formulae will be useless

Purpose :
enhance contrast of image (difference between max vs min value)

Question 7

can u do intensity scaling ?

Answer 7

ye or ne o_0