Image segmentation

Gradient of an image is obtained through

• Differentiation

• Partial Derivative

• Integration

• Difference

Which of the thresholding technique is appropriate when image histogram has more than two modes

• Single threshold

• Double threshold

• Otsu threshold

• Result is invariant to the underlying thresholding method

If T<3; then according to region growing algorithm, all the pixels with intensity values 5, will belong to seed point region

• True

• False

• Can't Say

Example of discontinuity approach in image segmentation is

• edge based segmentation

• boundary based segmentation

• region based segmentation

• Both a and b

For point detection we use

• first derivative

• second derivative

• third derivative

• Both a and b

Segmentation is a process of

• low level processes

• high level processes

• mid level processes

For edge detection we combine gradient with

• sharpening

• set theory

• smoothing

• thresholding

Double line effect is produced by

• first derivative

• second derivative

• third derivative

• Both a and b

Thresholding is the example of

• discontinuity

• similarity

• continuity

• recognition

The sum of LOG filter coefficients should be

• positive

• negative

• 0

• 1