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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
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
A standard for compressing moving pictures. MPEG uses the similarity between frames to create a sequence of I, B, and P frames. Only the I frame contains all the picture data. The B and P frames only contain information relating to changes since the last I frame. MPEG-1 uses a data rate of 1.2 Mbps, the speed of CD-ROM. MPEG-2 supports much higher quality with a data rate (also called bit rate) of from 1.2 to 15 Mbps. MPEG-2 is the format most favored for video on demand, DVD, and is the format for transmitting digital television.
Industry:Software
a) A process by which the coloring in a television image is altered or corrected electronically. Care must be taken to ensure that the modified video does not exceed the limits of subsequent processing or transmission systems. b) The adjustment of a color reproduction process to improve the perceived-color conformity of the reproduction to the original.
Industry:Entertainment
The signal used to modulate the color information in the color encoder and demodulate the color information in the color decoder. For (M) NTSC the frequency of the color subcarrier is about 3.579545 MHz and for (B, D, G, H, I) PAL it’s about 4.43 MHz.
Industry:Entertainment
Video which exists in the form of three separate signals, all of which are required in order to completely specify the color picture with sound. Most home video signals consist of combined (composite) video signals, composed of luminance (brightness) information, chrominance (color) information, and sync information. To get maximum video quality, professional equipment (Betacam and MII) and some consumer equipment (S-VHS and Hi-8) keep the video components separate.
Component video comes in several varieties: RGB (red, green, blue), YUV (luminance, sync, and red/blue) and Y/C (luminance and chrominance), used by S-Video (S-VHS and Hi-8) systems. All Videonics video products support the S-Video (Y/C) component format in addition to standard composite video.
Industry:Entertainment
a) A single video signal containing all of the necessary information to reproduce a color picture. Created by adding quadrature amplitude modulated R-Y and B-Y to the luminance signal. A video signal that contains horizontal, vertical and color synchronizing information.
b) A complete video including all synchronizing pulses; may have all values of chroma, hue and luminance; may also be many sources layered.
Industry:Entertainment
A digital video image or segment that has been processed using a variety of computer compression algorithms and other techniques to reduce the amount of data required to accurately represent the video content.
Industry:Entertainment
Contrast describes the difference between the white and black levels in a video waveform. If there is a large difference between the white and black picture levels, the image has high contrast. If there is a small difference between the white and black portions of the picture, the picture has low contrast and takes on a gray appearance.
Industry:Entertainment
The interference between two audio or two video signals caused by unwanted stray signals. a) In video, crosstalk between input channels can be classified into two basic categories: luminance/sync crosstalk; and color (chroma) crosstalk. When video crosstalk is too high, ghost images from one source appear over the other. b) In audio, signal leakage, typically between left and right channels or between different inputs, can be caused by poor grounding connections or improperly shielded cables. See Chrominance-to-Luminance Intermodulation.
Industry:Entertainment
