Digital Image Processing

We are asked to find how many pixels have intensities less than or equal to 4.
Let’s go through the matrix and count the number of pixels that satisfy .

The given matrix of pixel intensities is:

Row 1: 0, 1, 0, 2 (all are ≤ 4) — Count: 4
Row 2: 4, 7, 3, 3 (4, 3, 3 are ≤ 4) — Count: 3
Row 3: 5, 5, 4, 4 (4, 4 are ≤ 4) — Count: 2
Row 4: 6, 7, 3, 2 (3, 2 are ≤ 4) — Count: 2

Total count: