Question

Piecewise linear contrast stretch is performed on an 8-bit image. The output (\( BV_{{out}} \)) would be zero for input value \( BV_{{in}} \leq 80 \). The output (\( BV_{{out}} \)) would be 255 for \( BV_{{in}}>120 \). For the remaining input values, \( BV_{{out}} = (2 \times BV_{{in}}) - 20 \). If \( BV_{{in}} = 120 \), then \( BV_{{out}} \) is \rule{1.5cm{0.15mm} (Answer in integer).}

Hint:

For piecewise contrast stretch, always check which condition the input falls into before applying the respective formula.

Answer 1

Correct Answer: 220

Given: \[ BV_{{in}} = 120 \] Since \( 80<BV_{{in}} \leq 120 \), we use the contrast stretch formula: \[ BV_{{out}} = (2 \times 120) - 20 = 240 - 20 = 220 \] Final Answer: \fbox{220}