Which of the following is/are the fundamental factors that need tight control for difference based inspection work?

Which of the following is/are the fundamental factors that need tight control for difference based inspection work? Correct Answer All of the mentioned

Proper Registration does special marking into the product in case two images are identical so as the difference won’t create any sense. Controlled Illum ination is important because changes in illum ination can affect dramatically the difference image values. Noise levels of a difference image must low enough so that the variation due to noise won’t affect the difference value much.
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