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To convert a continuous sensed data into Digital form, which of the following is required?

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To convert a continuous sensed data into Digital form, which of the following is required?

(a) Sampling

(b) Quantization

(c) Both Sampling and Quantization

(d) Neither Sampling nor Quantization

The question was posed to me in an international level competition.

My doubt is from Basics Of Image Sampling & Quantization topic in chapter Digital Image Fundamentals of Digital Image Processing

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The correct choice is (c) Both Sampling and Quantization

The explanation: The output of the most sensor is a continuous waveform and the amplitude and spatial behavior of such waveform are related to the physical phenomenon being sensed.

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