Question

The subtracted image needs to be scaled, if 8-bit channel is used to display the subtracted images. So, the method of adding 255 to each pixel and then dividing by 2, has certain lim its. What is/are those lim its?

(a) Very complex method

(b) Very difficult to implement

(c) The truncation inherent in division by 2 causes loss in accuracy

(d) All of the mentioned

I had been asked this question during an interview for a job.

The doubt is from Enhancement using Arithmetic Operations topic in chapter Image Enhancement of Digital Image Processing

Answer 1

The correct option is (c) The truncation inherent in division by 2 causes loss in accuracy

Explanation: The given method is quite simple and easy to implement, however it has the lim itation of accuracy loss because of truncation inherent in division by 2 and also that it doesn’t ensure the full range usage.