Which technique is used to prevent the flicker effect during the viewing of a television image?

The technique of interlaced scanning is employed to prevent the flicker effect during the viewing of a television image. This process involves dividing each frame of video into two fields: one containing the odd lines of the image and the other containing the even lines. By displaying these fields alternately at a high refresh rate, interlaced scanning creates the illusion of a complete image with a smoother visual experience, minimizing flicker and enhancing the overall perception of motion and detail.

This method was particularly important in older television technologies, where a lower frame rate could lead to noticeable flickering if entire frames were displayed sequentially without the interlacing. In contrast, the other options, such as preamplification, synchronization, and depolarization, address different aspects of image processing and system performance, but they do not specifically target the flicker phenomenon caused by refresh timing and display methods.