Elementary Statistics and Computer Application

 

 

Video

 

• The term "video" commonly refers to related types of carrier formats —which can either be digital (DVD, Quicktime, Ogg) or analog videotape (VHS, Betamax).
• Television broadcasting and home movies have long been the traditional application of video technology
• The Internet has made possible the rise of compressed video file formats to syndicate video files to a global audience.
• Video is also used in scientific engineering,
• manufacturing, and security applications.

Video Consideration

• To get the highest video performance, we should
• Use video compression hardware to allow you to work with full-screen, full-motion video.
• Use a sophisticated audio board to allow you to use CD-quality sounds.
• Install a Super fast RAID (Redundant Array of Independent Disks) system that will support high-speed data transfer rates.
Obtaining Video Clip

• If using analog video, we need to convert it to digital format first (in other words, need to digitize the analog video first).
• Source for analog video can come from:
• Existing video content / clips
• beware of licensing and copyright issues
• Take a new footage (i.e. shoot your own video)
• Ask permission from all the persons who appear or speak, as well as the permission for the audio or music used.
Video basics

• Light passes through the camera lens and is converted to an electronic signal by a Charge Coupled Device (CCD)
• Most consumer-grade cameras have a single CCD.
• Professional–grade cameras have three CCDs, one for each Red, Green and Blue color information (RGB)
• The output of the CCD is processed by the camera into a signal containing three channels of color information and synchronization pulse (sync).
Video Compression

• Because of the large sizes associated with video files, video compression/decompression programs (Codec) have been developed.
• Lossless compression à preserve image throughout the compress/decompress process.
• Lossy compression à eliminates some of the data in the image (greater compression ratios) à usually used for video as some drop in quality is not noticable in moving images
• Trade-off is file size versus image quality.
• Common compression standards
• MPEG (Motion Picture Experts Group)
• JPEG (Joint Photographic Experts Groups)