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The digitization process i.e. the digital image has M rows and N columns, requires decisions about values for M, N, and for the number, L, of max gray levels. There are no requirements on M and N, other than that M and N have to be positive integer. However, the number of gray levels typically is

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The digitization process i.e. the digital image has M rows and N columns, requires decisions about values for M, N, and for the number, L, of max gray levels. There are no requirements on M and N, other than that M and N have to be positive integer. However, the number of gray levels typically is

(a) An integer power of 2 i.e. L = 2k

(b) A Real power of 2 i.e. L = 2k

(c) Two times the integer value i.e. L = 2k

(d) None of the mentioned

The question was asked in an online interview.

My enquiry is from Representing Digital Images in chapter Digital Image Fundamentals of Digital Image Processing

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The correct answer is (a) An integer power of 2 i.e. L = 2k

For explanation: Due to processing, storage, and considering the sampling hardware, the number of gray levels typically is an integer power of 2 i.e. L = 2k.

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