Edge Based Segmentation: (a) First-Order Derivative (b)Second-Order Derivative (c) Canny (d) Morphological Operation

Pre Test

1. Gradient computation equation is

a) |Gx|+|Gy|
b) |Gx|-|Gy|
c) |Gx|*|Gy|
d) |Gx|/|Gy|

2. Gradient magnitude images are more useful in?

a) point detection
b) line detection
c) area detection
d) edge detection

3. Sobel gradient is not that good for detection of?

a) Horizontal lines
b) Vertical lines
c) Diagonal lines
d) Edges

4. Smoothness reduced the bricks of

a) pixels
b) constant intensities
c) point pixels
d) edges

5. Second derivative approximation says that it is nonzero only at

a) ramp
b) step
c) onset
d) edges