Image Sensing and Acquisition MCQ [Free PDF] - Objective Question Answer for Image Sensing and Acquisition Quiz

1. The most familiar single sensor used for Image Acquisition is

A. Microdensitometer
B. Photodiode
C. CMOS
D. None of the Mentioned

Answer: B

The most familiar single sensor used for Image Acquisition is Photodiode. The photodiode is the most commonly used single sensor made up of silicon materials.

2. A geometry consisting of an in-line arrangement of sensors for image acquisition

A. A photodiode
B. Sensor strips
C. Sensor arrays
D. CMOS

Answer: B

Sensor strips are very common next to a single sensor and use an in-line arrangement.

3. CAT in imaging stands for

A. Computer-Aided Telegraphy
B. Computer-Aided Tomography
C. Computerised Axial Telegraphy
D. Computerised Axial Tomography

Answer: D

Industrial Computerised Axial Tomography is based on image acquisition using sensor strips.

4. The section of the real plane spanned by the coordinates of an image is called the _____________

A. Spacial Domain
B. Coordinate Axes
C. Plane of Symmetry
D. None of the Mentioned

Answer: A

The section of the real plane spanned by the coordinates of an image is called the Spatial Domain, with the x and y coordinates referred to as Spacial coordinates.

5. The difference in intensity between the highest and the lowest intensity levels in an image is ___________

A. Noise
B. Saturation
C. Contrast
D. Brightness

Answer: C

Contrast is the measure of the difference in intensity between the highest and the lowest intensity levels in an image.

6. _____________ is the effect caused by the use of an insufficient number of intensity levels in smooth areas of a digital image.

A. Gaussian smooth
B. Contouring
C. False Contouring
D. Interpolation

Answer: C

False Contouring is the effect caused by the use of an insufficient number of intensity levels in smooth areas of a digital image. It is called so because the ridges resemble the contours of a map.

7. The process of using known data to estimate values at unknown locations is called

A. Acquisition
B. Interpolation
C. Pixelation
D. None of the Mentioned

Answer: B

Interpolation is the process used to estimate unknown locations. It is applied in all image resampling methods.

8. Which of the following is NOT an application of Image Multiplication?

A. Shading Correction
B. Masking
C. Pixelation
D. Region of Interest operations

Answer: C

Pixelation is NOT an application of Image Multiplication. Because Pixelation deals with the enlargement of pixels.

9. The procedure done on a digital image to alter the values of its individual pixels is

A. Neighbourhood Operations
B. Image Registration
C. Geometric Spatial Transformation
D. Single Pixel Operation

Answer: D

It is expressed as a transformation function T, of the form s=T(z), where z is the intensity.

10. In Geometric Spatial Transformation, points whose locations are known precisely in input and reference images.

A. Tie points
B. Réseau points
C. Known points
D. Key-points

Answer: A

Tie points, also called Control points are points whose locations are known precisely in input and reference images.

11. Of the following, _________ has the maximum frequency.

A. UV Rays
B. Gamma Rays
C. Microwaves
D. Radio Waves

Answer: B

Gamma Rays come first in the electromagnetic spectrum sorted in the decreasing order of frequency.

12. In the Visible spectrum the ______ color has the maximum wavelength.

A. Violet
B. Blue
C. Red
D. Yellow

Answer: C

Red is towards the right in the electromagnetic spectrum sorted in the increasing order of wavelength.

13. Wavelength and frequency are related as : (c = speed of light)

A. c = wavelength / frequency
B. frequency = wavelength / c
C. wavelength = c * frequency
D. c = wavelength * frequency

Answer: D

It is usually written as wavelength = c / frequency.

14. Electromagnetic waves can be visualized as a

A. sine wave
B. cosine wave
C. tangential wave
D. None of the mentioned

Answer: A

Electromagnetic waves are visualized as sinusoidal waves.

15. How is radiance measured?

A. lumens
B. watts
C. Armstrong
D. hertz

Answer: B

Radiance is the total amount of energy that flows from the light source and is measured in Watts.

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