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 __________ (Answer in integer).

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 __________ (Answer in integer).

cdquestions Admin · Accepted Answer

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

		Reference Data
		Class 1	Class 2	Class 3	Class 4
Classified Data	Class 1	320	8	7	3
	Class 2	12	270	6	2
	Class 3	9	6	410	5
	Class 4	14	2	3	350

Location of pixels in input image (Row, Column)	Brightness Value
(5, 3)	9
(5, 4)	11
(6, 3)	14
(6, 4)	12

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