Interlaced Video

Interlaced video (also known as interlaced video) is a technique for doubling the perceived frame rate of a video image without consuming extra bandwidth. The interlaced signal contains two fields of a video frame captured in succession. This improves the viewer's perception of motion and reduces flicker by taking advantage of the phi phenomenon.

This effectively doubles the time resolution (also called temporal resolution) compared to non-interlaced shooting (for frame rates equal to field rates). Interlaced signals naturally require a screen that can display individual fields in a sequential order. CRT displays and ALiS plasma displays are made to display interlaced signals.

Two different techniques are used to process digital video today. These are interlaced and progressive scanning methods. Which technique to use depends on the application and video system.

Interlaced Scanning:

Interlaced scan-based images consist of 576 lines across a standard TV (CRT) screen. Techniques developed for cathode ray tubes are used. These lines are divided into two as odd and even lines, and when the whole picture is taken into consideration, it creates the whole picture by pressing the first single and secondly even lines to the screen.

In fact, we can define it as printing a whole picture as two pictures in half resolution, one after the other. However, this may cause instant glare on the screen, which we call flicker.

Interlaced scanning has been used around the world for years in analog cameras, televisions and VHS videos. It is also frequently used in today's HD broadcasts. However, it is expected to be replaced by progressive scanning in the future.

Progressive Scan:

Progressive scanning is not as two separate images as in interlaced scanning, but on the contrary, the lines are scanned in order and the image is renewed as a whole. In other words, the scan of the captured images is not divided into separate areas such as interlaced. Therefore, it is not expected to create a flicker effect on the screen.

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Latest Updates on Jan 13, 2022