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Digital Image Processing Mcqs

Q:

Region of Interest (ROI) operations is commonly called as ___________

A) Shading correction B) Masking
C) Dilation D) None of the Mentioned
 
Answer & Explanation Answer: B) Masking

Explanation: A common use of image multiplication is Masking, also called ROI operation.

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453
Q:

Which of the following operations are used for masking?

A) AND, OR B) AND, NOT
C) NOT, OR D) All of the mentioned
 
Answer & Explanation Answer: C) NOT, OR

Explanation: AND, OR operators are used for masking, while NOT works as negative transformation.

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394
Q:

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

A) Neighbourhood Operations B) Image Registration
C) Geometric Spacial Transformation D) Single Pixel Operation
 
Answer & Explanation Answer: D) Single Pixel Operation

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

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387
Q:

Which of the following is the primary objective of sharpening of an image?

A) Blurring the image B) Highlight fine details in the image
C) Increase the brightness of the image D) Decrease the brightness of the image
 
Answer & Explanation Answer: B) Highlight fine details in the image

Explanation: The sharpening of image helps in highlighting the fine details that are present in the image or to enhance the details that are blurred due to some reason like adding noise.

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387
Q:

In which step of processing, the images are subdivided successively into smaller regions?

A) Image enhancement B) Image acquisition
C) Segmentation D) Wavelets
 
Answer & Explanation Answer: D) Wavelets

Explanation: Wavelets are the foundation for representing images in various degrees of resolution. Wavelets are particularly used for image data compression and for pyramidal representation, in which images are subdivided successively into smaller regions.

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349
Q:

The spatial coordinates of a digital image (x,y) are proportional to:

A) Position B) Brightness
C) Contrast D) Noise
 
Answer & Explanation Answer: B) Brightness

Explanation: The Brightness levels are distributed over the spatial area. Hence, the spatial coordinates are proportional to brightness levels.

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321
Q:

In spatial domain, which of the following operation is done on the pixels in sharpening the image?

A) Integration B) Average
C) Median D) Differentiation
 
Answer & Explanation Answer: D) Differentiation

Explanation: We know that, in blurring the image, we perform the average of pixels which can be considered as integration. As sharpening is the opposite process of blurring, logically we can tell that we perform differentiation on the pixels to sharpen the image.

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319
Q:

Image processing approaches operating directly on pixels of input image work directly in ____________

A) Transform domain B) Spatial domain
C) Inverse transformation D) None of the Mentioned
 
Answer & Explanation Answer: B) Spatial domain

Explanation: Operations directly on pixels of input image work directly in Spatial Domain.

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