Progressive scan

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Progressive scan is a method used in video displays and broadcasting where each frame of a video is drawn sequentially from top to bottom. This contrasts with interlaced video, where each frame is split into two fields, with one field containing the odd lines and the other containing the even lines.

Overview

Progressive scan is often abbreviated as p (e.g., 720p, 1080p) and is a key feature in modern televisions, computer monitors, and digital video formats. It provides a smoother and more detailed image compared to interlaced video, especially for fast-moving images.

History

The concept of progressive scan dates back to the early days of television technology, but it became more prominent with the advent of digital television and high-definition television (HDTV). Early television systems used interlaced scanning to conserve bandwidth, but as technology advanced, the benefits of progressive scan became more apparent.

Technical Details

In progressive scan, each frame is displayed in its entirety, which reduces flicker and provides a clearer image. This is particularly beneficial for computer graphics, video games, and sports broadcasting, where motion clarity is crucial.

Resolution

Progressive scan is often associated with specific resolutions:

• 480p: Standard definition, commonly used in DVDs.
• 720p: High definition, used in some HDTV broadcasts.
• 1080p: Full high definition, widely used in Blu-ray discs and streaming services.
• 2160p: Also known as 4K resolution, used in Ultra HD displays.

Advantages

• **Improved Image Quality**: Progressive scan provides a sharper and more detailed image.
• **Reduced Flicker**: By displaying the entire frame at once, progressive scan reduces flicker, which is common in interlaced video.
• **Better Motion Handling**: Progressive scan handles fast-moving images better, making it ideal for sports and action-packed content.

Applications

Progressive scan is used in various applications, including:

• Television broadcasting
• Computer monitors
• Digital cinema
• Video game consoles
• Streaming services

Comparison with Interlaced Video

While interlaced video was the standard for many years, progressive scan has become more prevalent due to its superior image quality. Interlaced video can suffer from artifacts such as combing and motion blur, which are less common in progressive scan.

Related Pages

• Interlaced video
• High-definition television
• Digital television
• 4K resolution
• Computer monitor
• Video game console

See Also

• Display resolution
• Frame rate
• Video signal