Question

The histogram of a red band in a 3-bit satellite image is shown below. Which of the following statements is/are correct? 

• A. There are more darker pixels in the image
• B. There are more brighter pixels in the image
• C. The mean digital number of the image is 1250
• D. It may be predicted that approximately 40% of area in the image is covered by material with low spectral albedo in red band

Hint:

In a histogram of pixel values, peaks at lower DNs suggest dominance of dark pixels with low spectral reflectance.

Answer 1

The Correct Option is A, D

The histogram shows the frequency of pixels across 3-bit digital numbers (0 to 7).

Most pixels are concentrated at lower digital numbers (especially 0 and 1), indicating a large number of darker pixels. Hence, (A) is correct.
Since lower digital numbers correspond to lower reflectance (low albedo), we can infer that much of the area reflects poorly in the red band — possibly vegetation or water — validating (D).
(B) is incorrect since brighter pixels (higher DNs like 5–7) are less frequent.
(C) is incorrect because the mean DN cannot be 1250 for a 3-bit (max value 7) image.

Final Answer: \(\fbox{(A), (D)}\)