- المجال:
- Number of terms: 20560
- Number of blossaries: 0
- Company Profile:
Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
High-Definition Television. A television system with approximately twice the horizontal and twice the vertical resolution of current 525-line and 625-line systems, component colour coding (e.g. RGB or (YCbCr)) a picture aspect ratio of 16:9 and a frame rate of at least 24 Hz. Currently there are a number of proposed HDTV standards, including HD-MAC, HiVision and others.
Industry:Entertainment
An improved version of the 8mm tape format capable of recording better picture resolution (definition). A higher-density tape is required which provides a wider luminance bandwidth, resulting in sharper picture quality (over 400 horizontal lines vs. 240 for standard 8mm) and improved signal-to-noise ratio. Camcorders using this format are very small, light and provide a picture quality similar to S-VHS.
Industry:Entertainment
An MPEG video frame incorporating intraframe compression where only the information in a single frame is considered. Unlike P and B frames, I frames do not take redundancy between adjacent frames into account. I Frame encoding compresses at up to a 6:1 ratio before noticeable
Industry:Entertainment
Joint Photographic Expert Group. JPEG is a high-quality, single-picture spatial compression standard for still video images that allows the image to occupy less memory or disk space. Uses DCT algorithm (Discrete Cosine Transfer). Has been adapted to video but provides no frame compression. Like the MPEG standard, it includes options for trading off between storage space and image quality.
Industry:Entertainment
LZW Compression is the algorithm used by the Unix compress command to reduce the size of files, eg. for archival or transmission. The algorithm relies on repetition of byte sequences (strings) in its input. It maintains a table mapping input strings to their associated output codes. The table initially contains mappings for all possible strings of length one. Input is taken one byte at a time to find the longest initial string present in the table. The code for that string is output and then the string is extended with one more input byte, b. A new entry is added to the table mapping the extended string to the next unused code (obtained by incrementing a counter). The process repeats, starting from byte b. The number of bits in an output code, and hence the maximum number of entries in the table is usually fixed and once this limit is reached, no more entries are added.
Industry:Entertainment
NTSC (National Television System Committee) is the USA video standard with image format 4:3, 525 lines, 60 Hz and 4 Mhz video bandwidth with a total 6 Mhz of video channel width. NTSC uses (YIQ)
Industry:Entertainment
PAL (Phase Alternating Line) is the European video standard with image format 4:3, 625 lines, 50 Hz and 4 Mhz video bandwidth with a total 8 Mhz of video channel width. PAL uses (YUV).
Industry:Entertainment
The uncompressed bit rates for transmitting QCIF at 29.97 frames/sec is 9.115 Mbit/s.
Industry:Entertainment
Artistic effects added to a video production in order to enhance the production by creating drama, enhancing the mood or furthering the story. Special effects may vary from the limited addition of patterns or the mixing of several video images together, to sophisticated digital effects such as picture compression, page flipping and three-dimensional effects. Special effects are usually created using segs.
Industry:Entertainment
Type of video signal used in Hi8, S-VHS and some laserdisc formats. It transmits luminance and color portions separately, using multiple wires thereby keeping any signal interaction (degradation) to a minimum. S-Video avoids composite video encoding, such as NTSC, and the resulting loss of picture quality. Also known as Y/C Video.
Industry:Entertainment
