# Digital Image Processing Questions and Answers – Intensity Transformation Functions

«
»

This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on “Intensity Transformation Functions”.

1. How is negative of an image obtained with intensity levels [0,L-1] with “r” and “s” being pixel values?
a) s = L – 1 + r
b) s = L – 1 – r
c) s = L + 1 + r
d) s = L + 1 + r

Explanation: The negative is obtained using s = L – 1 + r.

2. The general form of log transformations is ____________________
a) s = c.log(1 + r)
b) s = c+log(1 + r)
c) s = c.log(1 – r)
d) s = c-log(1 – r)

Explanation: s = c.log(1 + r) is the log transformation.

3. Power-law transformations has the basic form of ________________ where c and ∆ are constants.
a) s = c + r
b) s = c – r
c) s = c * r
d) s = c / r.∆

Explanation: s = c * r is called the Power-law transformation.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

4. For what value of the output must the Power-law transformation account for offset?
a) No offset needed
b) All values
c) One
d) Zero

Explanation: When the output is Zero, an offset is necessary.

5. What is Gamma Correction?
a) A Power-law response phenomenon
b) Inverted Intensity curve
c) Light brightness variation
d) None of the Mentioned

Explanation: The exponent in Power-law is called gamma and the process used to correct the response of Power-law transformation is called Gamma Correction.

6. Which process expands the range of intensity levels in an image so that it spans the full intensity range of the display?
b) Contrast sketching
c) Gamma correction
d) None of the Mentioned

Explanation: Contrast sketching is the process used to expand intensity levels in an image.

7. Highlighting a specific range of intensities of an image is called _______________
a) Intensity Matching
b) Intensity Highlighting
c) Intensity Slicing
d) None of the Mentioned

Explanation: Highlighting a specific range of intensities of an image is called Intensity Slicing.

8. Highlighting the contribution made to total image by specific bits instead of highlighting intensity-level changes is called ____________________
a) Intensity Highlighting
b) Byte-Slicing
c) Bit-plane slicing
d) None of the Mentioned

Explanation: It is called Bit-plane slicing.

9. Which of the following involves reversing the intensity levels of an image?
a) Log Transformations
b) Piecewise Linear Transformations
c) Image Negatives
d) None of the Mentioned

Explanation: Image negatives use reversing intensity levels.

10. Piecewise Linear Transformation function involves which of the following?
a) Bit-plane slicing
b) Intensity level slicing
c) Contrast stretching
d) All of the Mentioned

Explanation: Piecewise Linear Transformation function involves all the mentioned functions.

Sanfoundry Global Education & Learning Series – Digital Image Processing.

To practice all areas of Digital Image Processing, here is complete set of 1000+ Multiple Choice Questions and Answers.