Virtual Labs

Point Operations

1. For a dark input image (most pixels have low gray values), which of the following transformations on gray values(r) produces a better image

a: log(r) b: r + a; a > 0 c: ar+b; a and b are > 0 d: None of the above

2. The linear transformation function f(r) =4r+160 produces which of the following changes in input image, where r denotes gray values of input image?

a: Increased contrast b: Decreased brightness c: Increased brightness d: No change