Question

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

(a) Proper registration

(b) Controlled illum ination

(c) Noise levels should be low enough so that the variation due to noise won’t affect the difference value much

(d) All of the mentioned

The question was asked in homework.

I would like to ask this question from Enhancement using Arithmetic Operations topic in portion Image Enhancement of Digital Image Processing

Answer 1

The correct option is (d) All of the mentioned

Easy explanation: 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.