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What is the common rate of an image forming in a camera?

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What is the common rate of an image forming in a camera?

(a) 20 images per second

(b) 30 images per second

(c) 25 images per second

(d) 50 images per second

This question was posed to me in class test.

I need to ask this question from Principle of Working topic in chapter Machine Vision Systems of Engineering Metrology

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Right option is (b) 30 images per second

To explain: A camera may typically form an image 30 times per sec i.e. at 33 m sec intervals. At each time interval the entire image has to be captured and frozen for processing by an image processor. An analog to digital converter is used to convert analog voltage of each detector into digital value.

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