Transforms

Question 1

Want to make image brighter.

Answer 1

Add constant.

Question 2

Want to make image darker.

Answer 2

Subtract constant.

Question 3

Increase contrast in image.

Answer 3

Multiply by constant. Higher slope in intenity transfer.

Question 4

Inverse transform.

Answer 4

Max intesity value - pixel value

Question 5

Gamma transformation.

Answer 5

Transformation ”bendy” intensity function.
Gamma < 1 lightens
Gamma > 1 darkens

Question 6

Log transformation.

Answer 6

Visualises brigter regions in dark regions.

Question 7

Histogram

Answer 7

Shows pixels with specific value.

Question 8

Histogram thresholding

Answer 8

Image with nice peaks (bimodal) —> separate background and object.

Question 9

Histogram equalization

Answer 9

Flattening the histogram by distributing the intensity values.