# Digital Image Processing Questions and Answers – Mathematical Tools in Digital Image Processing

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This set of Digital Image Processing Multiple Choice Questions & Answers (MCQs) focuses on ” Mathematical Tools in Digital Image Processing”.

1. How is array operation carried out involving one or more images?
a) array by array
b) pixel by pixel
c) column by column
d) row by row

Explanation: Any array operation is carried out on a pixel by pixel basis.

2. The property indicating that the output of a linear operation due to the sum of two inputs is same as performing the operation on the inputs individually and then summing the results is called ___________
b) heterogeneity
c) homogeneity
d) None of the Mentioned

Explanation: This property is called additivity .

3. The property indicating that the output of a linear operation to a constant times as input is the same as the output of operation due to original input multiplied by that constant is called _________
b) heterogeneity
c) homogeneity
d) None of the Mentioned

Explanation: This property is called homogeneity .
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4. Enhancement of differences between images is based on the principle of ____________
b) Homogeneity
c) Subtraction
d) None of the Mentioned

Explanation: A frequent application of image subtraction is in the enhancement of differences between images .

5. A commercial use of Image Subtraction is ___________
b) MRI scan
c) CT scan
d) None of the Mentioned

Explanation: Mask mode radiography is an important medical imaging area based on Image Subtraction.

6. Region of Interest (ROI) operations is commonly called as ___________
c) Dilation
d) None of the Mentioned

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

7. If every element of a set A is also an element of a set B, then A is said to be a _________ of set B.
a) Disjoint set
b) Union
c) Subset
d) Complement set

Explanation: A is called the subset of B.

8. Consider two regions A and B composed of foreground pixels. The ________ of these two sets is the set of elements belonging to set A or set B or both.
a) OR
b) AND
c) NOT
d) XOR

Explanation: This is called an OR operation.

9. Imaging systems having physical artefacts embedded in the imaging sensors produce a set of points called __________
a) Tie Points
b) Control Points
c) Reseau Marks
d) None of the Mentioned

Explanation: These points are called “known” points or “Reseau marks”.

10. 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

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

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