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An example of a continuous function of two variables is __________

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An example of a continuous function of two variables is __________

(a) Intensity function

(b) Contrast stretching

(c) Identity function

(d) Gaussian function

I got this question in an online interview.

The query is from Fundamentals of Spatial Filtering in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

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Best answer
Correct choice is (d) Gaussian function

The explanation is: Gaussian function has two variables and is an exponential continuous function.

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