Question

When linearly enhancing an image to higher radiometry, the count of unique digital numbers of the image:

• A. \(\text{Increases} \)
• B. \(\text{Decreases} \)
• C. \(\text{Remains the same} \)
• D. \(\text{Made to 1} \)

Hint:

Increasing radiometric resolution (bit-depth) increases the number of unique digital numbers (DNs) by providing more intensity levels for pixel values.

Answer 1

The Correct Option is A

Step 1: Understanding digital number (DN) values in radiometric enhancement. Radiometry refers to the bit-depth of an image, which defines the number of discrete intensity levels a pixel can take.
Step 2: Effect of linear enhancement on DN values. - Higher radiometry (bit-depth) means more levels are available, increasing the range of digital numbers (DN). - Linear enhancement spreads existing DN values across a wider range, effectively increasing the number of unique DN values.
Step 3: Selecting the correct option. Since radiometric enhancement increases the number of DN values, the correct answer is a. Increases.