HD: High Definition video. Most HD formats in use have a
resolution of either 1920x1080 resolution or 1280x720 resolution. A
substantial difference exists between the 1080 and 720 standards: the
larger format uses 2.25 more pixels per frame. This difference
substantially increases requirements for processing 1080 content in
terms of encoding time, decoding speed, and storage. The 720
formats are all progressive. The 1080 format has a mixture of
progressive and interlaced frame types. Computers and their displays
are inherently progressive, whereas television broadcasting has been
based on interlaced techniques and standards. For HD terminology,
we indicate progressive with the letter ‘p’ and interlaced with the
letter ‘i’.
HDV: A format for the recording and playback of high-definition
video on a DV cassette tape. has been established as the ‘HDV’
format. Instead of the ‘DV’ codec, HDV uses a flavor of MPEG-2 .
There are two varieties of HDV: HDV1 and HDV2. HDV1 is
1280x720 resolution with progressive frames (720p). The MPEG
transport stream is 19.7 Mbps/s. HDV2 is 1440x1080 resolution with
interlaced frames (1080i). The MPEG transport stream is 25 Mbps/s.
Hi8: Improved version of Video8 using S-Video recorded on
metal particle or metal evaporated tape. Because of higher
luminance resolution and wider bandwidth, the result is sharper
pictures than Video8.
HiColor: For images, this normally means a 16-bit (5-6-5) data type
that can contain up to 65,536 colors. TGA file formats support
images of this type. Other file formats require prior conversion of a
HiColor image into TrueColor. For displays, HiColor normally
refers to 15-bit (5-5-5) display adapters that can display up to 32,768
colors. Bit
Huffman coding: Technique used in JPEG and other data
compression methods in which seldom occurring values receive a
long code, while frequently-occurring values receive a short code.
IDE: “Integrated Device Electronics” – a hard-drive interface that
combines all drive control electronics on the drive itself, rather than
on the adapter connecting the drive to the expansion bus.
