Display systems: the technique of skipping every other line on the first pass and drawing the skipped lines on a second pass is called:

Difficulty: Easy

Correct Answer: Interlacing

Explanation:


Introduction / Context:
Video displays can update images in different patterns. Legacy television standards improved perceived flicker and bandwidth use by drawing alternate lines in successive passes, a method known as interlacing. Understanding how interlacing differs from raster-scan and vector methods clarifies terminology in graphics and display engineering.


Given Data / Assumptions:

  • The method described draws odd lines first, then even lines (or vice versa).
  • Interlacing targets reduced flicker and bandwidth at a given frame rate.
  • Other techniques (vector/refresh-vector, stroke) draw lines as directed paths, not in alternating raster fields.


Concept / Approach:
Interlaced scanning divides each full frame into two fields. Field 1 contains every other line, and Field 2 fills in the remainder. By refreshing fields more often than full frames, the eye perceives smoother motion at lower data rates. Raster-scan draws every line sequentially each frame. Vector (stroke) displays steer the beam along line segments rather than sweeping rows of pixels.


Step-by-Step Solution:
Match “skip lines on first pass, draw them on second” with interlacing.Eliminate vector/refresh-vector and stroke writing, which do not use alternating fields.Confirm the term: Interlacing.


Verification / Alternative check:
Standards such as 1080i exemplify interlaced video using two fields to complete a frame.


Why Other Options Are Wrong:
Refresh-vector (B) and stroke (D) are vector-based methods. Raster-scan (C) draws consecutive lines without skipping every other line.


Common Pitfalls:
Confusing interlacing with “interpolation.” Interlacing is a scan pattern, not a resampling algorithm.


Final Answer:
Interlacing.

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