Which technique helps prevent flicker effects when viewing a CRT television image?

Interlaced scanning is a technique used primarily in traditional CRT (cathode ray tube) televisions to enhance the quality of the displayed image and reduce flicker. This method involves dividing the image into two fields: one that contains all the odd lines of the image and another that contains all the even lines. These fields are displayed alternately at a high frequency, which creates the illusion of a complete, flicker-free image to the viewer.

The alternating display of fields allows each field to refresh the image in half the time it would take to refresh a full image, reducing the perception of flicker that can occur when the display refresh rate is not fast enough. This technique is crucial, particularly in the context of older CRT displays, where refresh rates could lead to noticeable flicker if the image were updated in a non-interlaced manner.

In contrast, synchronization ensures that the display timing and the input signal timing are matched, which is important for preventing misalignment in the displayed image, but it does not directly address flicker. Preamplification refers to the strengthening of a signal before it gets to the main amplification stage, affecting sound or image signal quality but not addressing flicker, while depolarization relates to the orientation of light