Which of the following is/are side effects of scan conversion ? a. Aliasing b.…
2017
Which of the following is/are side effects of scan conversion ?
a. Aliasing
b. Unequal intensity of diagonal lines
c. Overstriking in photographic applications
d. Local or Global aliasing
- A.
a and b
- B.
a, b and c
- C.
a, c and d
- D.
a, b, c and d
Attempted by 223 students.
Show answer & explanation
Correct answer: D
Answer: All four listed items are side effects of scan conversion.
Brief explanations:
Aliasing: When continuous image information is sampled onto a discrete pixel grid, high-frequency details can appear distorted or produce jagged edges and incorrect patterns.
Unequal intensity of diagonal lines: Diagonal lines traverse pixels unevenly, causing variable pixel coverage and perceived variations in brightness (the staircase effect).
Overstriking in photographic applications: Multiple overlapping exposures or rasterized strokes can produce unwanted darkening or artifacts when continuous content is converted to discrete samples or film.
Local or global aliasing: Aliasing can be local (small-scale jagged edges along object boundaries) or global (larger-scale patterns such as moiré); both arise from insufficient sampling relative to image frequency.
Mitigation: Techniques like anti-aliasing (filtering), supersampling, and careful sampling strategies reduce these scan-conversion artifacts.