Digital Video

Digital video is a type of video recording system that works by using a digital, but analog video signal representation. The general term for the name DV, which is a specific type of digital video is not to be confused with. Digital video is most often recorded on tape, the optical disk, usually distributed on DVD. There are exceptions such as camcorders that record directly to DVD, Digital8 camcorders which encode digital video on conventional analog tape, and most recently the JVC Everio G hard disk to record digital video camcorders.

The word "camera", "Video Camera", and "camcorder" interchangeably in this article are.

Introduction
interlaced and progressive scan: video cameras come in two different image capture formats. Cameras record interlaced image to create a set of lines: odd-numbered lines are scanned, and then the even numbered lines are scanned, the odd-numbered scan lines again, and so on. A set of odd or even lines of an "area" is referred to as, and a pair of two fields of opposite parity is constantly called a frame.

A progressive scan digital video camera specifically with two areas to be similar in each frame records. Thus, interlaced video captures twice as many fields per second as progressive video is the same number of frames per second on both work. This is a video of the causes of a "very real" is served, because a different image 60 times per second, draw the movie, which 24 or 25 progressive frames per second to record opposed .

Progressive scan camcorders such as Panasonic DVX100 generally more desirable because of the similarities they share with film. They both record frames progressively, which results in a crisper image. They both have 24 frames per second, the motion strobing (blurring theme is the fastest speed) can shoot in the results. Thus so, the progressive scanning video cameras for more than their interlaced counterparts are expensive. (Note that even if the digital video format only 29.97 [PAL or 25] frames per second interlaced, 24 frames per second progressive video for each frame to display the same fields, and some of the same image to display 3 fields is possible by allowing frames. For a more detailed explanation, adamwilt.com See link.)

Duplicate standard film stock, such as 16 mm and 35 mm recorded at 24 or 25 frames. NTSC and PAL, and that 30/1.001 (29.97) frames per second shot on the second, respectively, per 25 frames: For video, there are two frame rate standards.

With a decline in the quality of digital video can be copied. No matter how many generations of a digital source is copied, it's as clear as digital views of the original first generation will be.

Digital video can be processed and edited on an NLE, or non-linear editing station, a tool created especially to edit video and audio. These often as well as analog to digital sources can import but are intended to edit the video than anything else. Digital video hardware and software on a personal computer that can be edited appropriately. Using a NLE station, digital video for a command, or follow the sequence of video clips, can be manipulated. AVID 'software and hardware almost synonymous with professional NLE market, but Apple's Final Cut Pro, Adobe Premiere, and similar programs are also popular.

More and more, video is readily available, increasingly affordable hardware and software are editing. Even big budget movies like Cold Mountain, has been completely edited Final Cut Pro, Apple's non-linear editing software.

Regardless of software, usually enough disk space for digital video is edited on a setup. Digital standard DV / DVCPRO compression applied with 250 megabytes of video per minute or 13 gigabytes per hour charges.

Digital video is a much lower price than the 35 mm film, as can be seen in place without tape processing and tape stock itself is very cheap (about a 60 minute MiniDV tapes in bulk for $ 3, December , as of 2005). By comparison, about $ 1,000 per minute 35 mm film stock costs, including processing.

Digital video film is out. Digital (including high quality HDTV) television in the early 2000s started to spread in most developed countries. Digital video in modern mobile phones and video conferencing systems are used. Digital video, including video streaming and peer-to-peer movie distribution media, the Internet is used for distribution.

Many types of compression exist for serving digital video over the Internet and on DVD. While DV video is compressed beyond its own codec while editing, file with the codecs like Windows Media format on optical disk or results that are not practical for delivery over the Internet, size, MPEG2, MPEG4, Real Media, and more recently the H.264, and Sorenson Media codec. Perhaps the most widely used Internet video to MPEG4 and Windows Media formats, while almost exclusively for DVD MPEG2 is used, the minimum size to provide an exceptional image, but the CPU consumption of a high level, resulting in decompress.

As of 2005, the highest resolution digital video output to display 60 frames per second ("UHDV") to 33 megapixels (7680 4320 x), although it has been performed only in specialized laboratory settings [1]. Top speed industrial and scientific high-speed camera that up to one million frames per second video at 1024x1024 (for a very short time, of course) are capable of filming becomes available.

2006 Cordin ultra high speed imaging technology is the global leader in the field.

Frame rate camera system to use 200 million frames per second up to be. Integration and very short inter-frame times are standard. Gated and faster models are available. Other modules Cordin 1000 * 1000 pixels with color or black and white full frame rate in ultra high-speed camera system offers. Streak camera system and available for scientific applications are developed with advanced technology.

Near, medium or long wave infrared cameras for high speed applications, the Phoenix offers various possibilities. InGaAs, QWIP and InSb detectors to 30 KHz with a 900 nm wavelength in the range of 10 μm images with frame rate can get.

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